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Text File | 1996-01-04 | 82.0 KB | 2,053 lines

RAMDACs AcuMos: ADAC1 15/16/24 bit. Analog Devices: ADV471 6bit DAC 15 overlay registers ADV475 6bit DAC 15 overlay registers ADV476 6bit DAC ADV477 8bit DAC 15 overlay registers ADV478 6/8bit DAC 15 overlay registers ADV7129 True-Color 192bit pixel bus ADV7160 True color 96bit pixel bus. 10bit DACs. HW cursor. PLL ADV7162 ATI: ATI68830 15/16/24bit Up to 80 MHz ! ATI68860 15/16/24bit "Spectra" DAC for Mach64 ATI68875 15/16/24bit Up to 135 MHz ! Used in ATI Graphics Ultra + and Pro. Similar to TI34075 ATI68880 Very similar to 68860 AT&T: ATT20c40x ?? ATT20c490 15/16/24 bit. 6/8 bit DAC. ATT20c491 15/16/24 bit. 6/8 bit DAC w/gamma correction ATT20c492 15/16/18 bit 6bit DACs. w/gamma correction ATT20c493 15/16/18 bit 6bit DACs ATT20c497 24bit ? ATT20c498 24bit 16bit pixel databus ! ATT21c498 24bit 16bit pixel databus ! What's the diff? ATT22c498 24bit 16bit pixel databus ! Avance Logic: ALG1101 16-bit. Appears to be different from the other HiColor DACs. ALG1201 24bit ALG1301 24bit Avasem: AV3676 6bit DAC Brooktree: Bt458 8bit DAC upto 135MHz. Not VGA compatible Bt476 6bit DAC. Bt477 6/8bit DAC Bt478 6/8bit DAC. Bt481 15/16bit Bt482 15/16bit Bt484 15/16/24bit 6/8bit DAC. Has hardware cursor. Bt485 15/16/24bit 6/8bit DAC. Has hardware cursor. Chrontel CH8391 CH8398 15/16/24bit and Clock chip Cirrus Logic CL-GD5200 15/16/24 bit Same as Acumos ADAC1 Diamond: SS2410 15/24 bit. OEM version of MUSIC MU9c1880 IBM: RGB514 24bit. 144pin. HW cursor, 64bit pixel bus. Clock generator. packed 24bit pixels RGB524 24bit. 144pin. HW cursor, 64bit pixel bus. Dual clock generator packed 24bit pixels RGB525 24bit. 208pin. HW cursor, 64bit pixel bus. Clock generator packed 24bit pixels RGB526 24bit. 144pin. HW cursor, 64bit pixel bus. Dual clock generator packed 24bit pixels RGB528 24bit. 208pin. HW cursor, 128bit pixel bus. Dual clock generator supports 24bit packed pixels RGB530 24bit. 208pin. HW cursor. 96bit pixel bus. Clock generator, 10bit DACs and LUTs, window attribute table RGB561 24bit. 304pin. HW cursor. 200bit pixel bus. Clock generator. 10bit DACs and LUTs RGB624 24bit. 144pin. HW cursor, 64bit pixel bus, Dual clock generator packed 24bit pixels, YUV to RGB conversion ICS: ICS5300 24bit Combined RAMDAC & Clock chip ICS5301 ICS5342 24bit Combined RAMDAC & Clock chip IC Works: W30c498 Similar to AT&T 20c498 W30c516 44pin "ZoomDAC" Inmos: IMSG171 IMSG173 IMSG174 IMSG176 6bit DAC IMSG178 MUSIC: MU9C1710 6 bit DAC MU9C4870 15/16 bit Similar to Sierra "Mark 3". MU9C1880 15/16/24bit Same as SS24 MU9C4910 15/16/24bit MU9C9910 15/16/24bit As 4910, but with dual clock generator onchip MU9C9750 6bit DAC with onchip clock generator w/powerdown MU9C9760 6bit DAC with onchip clock generator MU9C4160 15/16/24bit 16bit wide pixelbus MU9C9160 15/16/24bit As 4160, but with onchip clock generator OAK: OTI66 6bit DAC OTI66HC 15/16bit Similar to Sierra "Mark 3" S3: 86c716 (SDAC) Combined RAMDAC & Clockchip. Same as ICS 5300 86c708 (GenDAC) Combined RAMDAC & Clockchip. Same as ICS 5342 Samsung: KDA476 6bit DAC Standard '476 SGS-Thompson: STG1700 24bit 16bit pixel path. STG1702 24bit 44pin As 1700 + Supports "2 24bit pixels/3 VCLKs" STG1703 24bit 68pin As 1702 + onchip Clock Generator Sierra Semiconductors: Sierra "Mark1": Only works if the VGA controller can send a byte on both the rising AND falling edge of the dot clock. SC11481 15-bit. 6-bit DAC. Overlay. SC11486 15-bit. 6-bit DAC. SC11488 15 bit. 6/8 bit DAC. Overlay. Sierra "Mark2": SC11482 15-bit. 6-bit DAC. Overlay. SC11483 15-bit. 6-bit DAC. SC11484 15-bit. 6/8 bit DAC. Overlay. Sierra "Mark3": SC11485 15/16 bit. 6-bit DAC. Overlay. SC11487 15/16 bit. 6-bit DAC. SC11489 15/16 bit. 6/8 bit DAC. Overlay. SC15020 24bit 16bit pixel path SC15021 24bit 16bit pixel path SC15025 24 bit. SC15026 24 bit. TI: TLC34058 8bit upto 135MHz. Not VGA compatible TLC34075 24bit upto 135MHz TVP3010 24bit As 302x, but 32bit pixel path TVP3020 24bit 64bit pixel path TVP3025 24bit As 3020 + Programmable Clock Trident: TKD8001 24bit UMC: UM70c171 Standard 6bit DAC UM70c178 15/16 bit Similar to Sierra "Mark 3" UM70c188 24bit Winbond: W82c476 6bit DAC Standard '476 W82c478 6/8bit DAC Standard '478 W82c490 15/16/24bit Very close to the AT&T20c492 15-bit modes have 5 bits of each basic color: bit 0- 4 blue. 5- 9 green. 10-14 red. The pixel is stored in two bytes in Intel style (little endian). 16-bit modes have 5 bits of red and blue, and 6 bits of green: bits 0- 4 blue. 5-10 green. 11-15 red. The pixel is stored in two bytes in Intel style (little endian). 24-bit modes have 8 bits of each basic color: bits 0- 7 blue. 8-15 green 16=23 red. The pixel is stored in three bytes in Intel style (little endian). The DACs are addressed on port 3C6h-3C9h. Advanced DACs have 1 or 2 extra address lines (RS2 and RS3). These may be controlled from high address bits (A10-A15) (Compaq or Weitek cards) or from registers (S3, ATI....). In the following the DAC registers are named REGxx as follows: I/O: RS2: RS3: REG00 3C8h 0 0 REG01 3C9h 0 0 REG02 3C6h 0 0 REG03 3C7h 0 0 REG04 3C8h 1 0 REG05 3C9h 1 0 REG06 3C6h 1 0 REG07 3C7h 1 0 REG08 3C8h 0 1 REG09 3C9h 0 1 REG0A 3C6h 0 1 REG0B 3C7h 0 1 REG0C 3C8h 1 1 REG0D 3C9h 1 1 REG0E 3C6h 1 1 REG0F 3C7h 1 1 Many of these DACs can access REG06 using only the 4 standard DAC addresses (3C6h-3C9h) by reading 3C6h 4 or 5 times, then REG06 can be accessed at 3C6h. Type: "1r/w" Read 3C6h 4 times, then the next read or write of 3C6h will access the command register. Forcing HiColor DACs into command mode: Note: This works on the Sierra, ATT, Winbond DACs and clones, not on the Brooktree or TI DACs, also the MUSIC DACs will require an extra read of 3C6h. procedure dactocomm; {switches DAC to command register} var x:word; begin x:=inp($3C8); {clear old state} x:=inp($3C6); x:=inp($3C6); x:=inp($3C6); {Read $3C6 4 times.} x:=inp($3C6); end; Now reads and writes to $3C6 will access the command register. Depending on the DAC type you may have multiple read/writes, one write/multiple reads or one read/write of the command register before it switches back to the PEL register. Any access to $3C7-$3C9 will switch back to the PEL mask register. Forcing HiColor DACs into normal mode: procedure dactopel; {switches DAC back to normal mode} var x:word; begin x:=inp($3C8); end; HiColor DACs: (Sierra SC1148x, MUSIC MU9C4870, OAK OTI66HC, UMC UM70C178) REG04 (R/W): Overlay RAM Write Address (SC11481/2/4/5/8/9 only) bit 0-3 Write index for the Overlay registers. REG05 (R/W): Overlay RAM (SC11481/2/4/5/8/9 only) bit 0-5 Data port for the overlay registers. Works like the PEL data register (3C9h) except that the overlay registers are accessed and the Overlay Address registers are used for indexes. Note: on the SC11484/8/9 the Color Look-up Table and the overlay registers are 24bits wide (rather than 18bits) if the 8/6 pin is high. REG06 (R/W): Command Register bit 0 (SC11487) (R) Set if bits 5-7 is 1 or 3, clear otherwise 3-4 (SC11487) Accesses bits 3-4 of the PEL Mask registers (REG02) 5 (not SC11481/6/8) If set two pixel clocks are used to latch the two bytes needed for each pixel. Low byte is latched first. If clear the low byte is latched on the rising edge of the pixel clock and the high byte is latched on the falling edge. Only some VGA chips (ET4000 and C&T655x0) can handle this. 6 (SC11485/7/9, OTI66HC, UM70C178) Set in 16bit (64k) modes (Only valid if bit 7 set). On the SC11482/3/4 this bit is read/writable, but has no function. On the SC11481/6/8 this bit does not exist. 7 Set in HiColor (32k/64k) modes, clear in palette modes. Note: This register can also be accessed at 3C6h by reading 3C6h four times, then all accesses to 3C6h will go the this register until one of the registers 3C7h, 3C8h or 3C9h is accessed. REG07 (R/W): Overlay RAM Read Address (SC11481/2/4/5/8/9 only) bit 0-3 Read index for the Overlay registers. Analog Devices ADV7160,ADV7162 True-Color Video RAM-DAC: The ADV716x DACs are not really VGA compatible, but with proper initialisation palette writing and the PEL register can be simulated. REG00 W(R/W): Address Register bit 0-10 Controls the index read or written at REG01 or REG02. Regardless of the bus width this register is accessed by two 8bit reads or writes at this address, low byte first. REG01 REG02 Control Registers REG02 index 3 (R): ID Register bit 0-7 76h for the ADV7160, 79h for the ADV7162 REG02 index 4 (R/W): Pixel Mask Register bit 0-7 The pixel inputs (R, G and B) are anded with this value. Set to FFh for normal operation. REG02 index 5 (R/W): Command Register 1 bit 0 Calibration Control. If set the LOADIN/LOADOUT synchronization circuit is calibrated on every vertical sync (REG03 bit 5 must be 0) 1 Test Mode Control. Enable test mode if set 2 Should be set to 0 3 Hi-Byte Control. If set the high byte of the Address Register (REG00) is accessible, if clear it is not (ADV7150 compatible). 4-5 PS Function Control. Controls how the PS0/1 inputs are used. 0: Palette Select Mode. The PS0/1 inputs selects between 4 devices by comparing with REG03 bits 6-7 on a pixel by pixel base, 1: (ADV7160) Bypass Mode. PS1 switches between Palette Mode and Bypass Mode on a pixel by pixel basis. Bits 6-7 controls the Bypass Mode. Bypass mode should not be selected in Command Register 2 (REG02 index 6) and by this field at the same time, 2: Overlay Mode. PS0/1 select one of the three overlay colors (PS0/1 = 0 for pixel data), 3: Ignore PS Inputs. The PS0/1 inputs are completely ignored. 6-7 Bypass Color Mode Control. Controls the bypass mode switching. 0: 15bit bypass, 1: 16bit bypass, 2: 24bit bypass REG02 index 6 (R/W): Command Register 2 bit 0-1 Should be set to 0 2 /SYNC Recognition on Green. If set the /SYNC input is encoded on the IOG output. 3 Pedestal Enable Control. Set for a 7.5 IRE blanking pedestal, clear for a 0 IRE pedestal. 4-7 True-Color/Bypass/Pseudo-Color Mode Control. 0: 8bit Pseudo Color on R0-7, 4: 8bit Pseudo Color on G0-7, 8: 8bit Pseudo Color on B0-7, 9: 16bit Bypass Mode on G0-7 + R0-7, 10: 15bit Bypass Mode on G0-7 + R0-6, 11: 16bit True Color Mode on G0-7 + R0-7, 12: 15bit True Color Mode on B3-7 + G3-7 + R3-7, 13: 15bit True Color Mode on G0-7 + R0-6, 14: 24bit True Color Mode, 15: 16bit Bypass Mode REG02 index 7 (R/W): Command Register 3 bit 0-1 PROGCKOUT Frequency Control. Determines the PROGCKOUT output clock frequency relative to the pixel clock (CLOCK). 0: CLOCK/4, 1: CLOCK/8, 2: CLOCK/16, 3: CLOCK/32 2-4 /BLANK Pipeline Delay Control. Controls the delay of the /BLANK signal (in addition to the overall device pipeline delay Tpd). Adds N * LOADOUT to the /BLANK delay. 5 Should be set to 0 6-7 Pixel Multiplex Control. 0: 1:1 MUXING - LOADOUT = CLOCK, 1: 2:1 MUXING - LOADOUT = CLOCK/2, 2: 8:1 MUXING - LOADOUT = CLOCK/8 (Pseudo Color Mode only), 3: 4:1 MUXING - LOADOUT = CLOCK/4, REG02 index 8 (R/W): Command Register 4 bit 0 HDTV Sync Control. If set the /TRISYNC input is encoded enabling a Tri-Level Sync output. 1 /SYNC Recognition Control on Red. If set the /SYNC input is encoded on the IOR output. 2 /SYNC Recognition Control on Blue. If set the /SYNC input is encoded on the IOB output. 3-4 Gain Control. Selects the Video Standard used. Value: DAC Gain: Video Standard Black to White current: 0 3996 RS343A, Sync & Pedestal 660mV 17.62mA 1 4224 RS343A, Sync, No Pedestal 699mV 18.63mA 2 4311 RS343A, No Sync, No Pedestal 714mV 19.05mA 3 5592 RS170, Sync & Pedestal 925mV 24.67mA 5 Signature Clock Control. Enables the Signature Analyser if set 6 Signature Reset. To reset the Signature Analyser write 0, then 1 to this field. 7 Signature Acquire. Enables Signature Acquisition if set REG02 index 9 (R/W): PLL Command Register bit 0 PLL Control. Enables the PLL if set 1 RSEL Bit Control. When set the PLL Reference Divider is in units of 2, if clear in units of 1. See REG02 index 0Ch for details. 2 VSEL Bit Control. When set the PLL Feedback Divider is in units of 2, if clear in units of 1. See REG02 index 0Fh for details. 3 Should be set to 0 4-5 Output Divide Control. Selects the Post divider for the VCO 0: VCO/1, 1: VCO/2, 2: VCO/4, 3: VCO/8 6-7 PLL S Control. The lower two bits of the PLL Feedback value. See REG02 index 0Fh for details. REG02 index 0Ah (R): Status Register bit 0 Set if either of the IOR,IOG or IOB outputs exceeds the internal voltage of the /SENSE comparator circuit REG02 index 0Bh (R): Revision Register bit 0-? Silicon Revision Code. REG02 index 0Ch (R/W): PLL R Register bit 0-6 Controls the PLL Reference Divider value together with the RSEL bit (index 9 bit 1). If this field is set to 0 the PLL stops. The effective value is: (1+RSEL)*(This_Field+2). This allows all values from 3-129 and all even values from 130-258. REG02 index 0Dh (R/W): Command Register 5 bit 0-5 Should be set to 0 6 Set to enable the internal PLL, clear to disable it 7 Should be set to 0 REG02 index 0Fh (R/W): PLL V Register bit 0-6 Controls the PLL Feedback Divider value together with the VSEL bit (index 9 bit 2). If this field is set to 0 the PLL stops. The effective value is: (1+VSEL)*(4*(This_Field+2)+ S) where S is the value from REG02 index 0Ch bits 6-7. This allows all values from 12-519 and all even values from 520-1038 REG02 index 10h (R): Signature Red Register REG02 index 11h (R): Signature Blue Register REG02 index 12h (R): Signature Green Register REG02 index 13h (R): Signature Misc Register REG02 index 200h W(R/W): Cursor X Register bit 0-15 The X coordinate of the cursor as a 2's complement (-4096 to 4095). Note: Low byte in index 200h, High byte in index 201h Note: When accessing the cursor X/Y registers (index 200h to 203h) the index register autoincrements with each access. These registers must be updated in the order 200h,201h,202h and then 203h REG02 index 202h W(R/W): Cursor Y Register bit 0-15 The Y coordinate of the cursor as a 2's complement (-4096 to 4095). Note: Low byte in index 202h, High byte in index 203h Note: When accessing the cursor X/Y registers (index 200h to 203h) the index register autoincrements with each access. These registers must be updated in the order 200h,201h,202h and then 203h REG02 index 204h (R/W): Cursor Control Register bit 0-1 Cursor Mode Control. 1: X11 cursor, 2: XGA cursor Pattern: X11 cursor: XGA cursor: 0 Transparent Color 1 1 Transparent Color 2 2 Color 1 Transparent 3 Color 2 Bit-Wise Complement (XOR cursor) 2 Cursor Enable. Enables the cursor if set 3 Interlace Control. Set for interlaced modes. 4-7 Should be set to 0 REG02 index 303h (R/W): Color 2 REG02 index 304h (R/W): Color 1 REG02 index 400h-7FFh (R/W): Cursor Image bit 0-7 The 64x64 cursor image is stored in these 1024 bytes with 4 2bit "pixels" per index. Index 400h holds the 4 leftmost pixels of the first (topmost) line, index 40Fh the 4 rightmost and index 7FFh the 4 rightmost pixels of the last line. REG02 index 0-2, 0Eh, 14h and 15h are labeled as "Test Registers" REG03 (R/W): Mode Register bit 0 Reset Control. To reset the pixel port sampling sequence to start with port A, write 1, then 0 and finally 1 to this bit. 1 RAM-DAC Resolution Control. If set the LUT and DACs are 10bits, if clear LUT and DACs are 8bits (lower 2 inputs to the 10bit DACs are forced to 0). 2 MPU Data Bus Width. If set the MPU interface is 10 bits wide 3-4 Operational Mode Control. 0 for normal operation 5 Calibrate LOADIN. To calibrate the LOADIN/LOADOUT synchronization circuit write 0, then 1 to this bit. Should be 0 for normal operation. 6-7 Palette Select Match Bits Control. If Command Register 1 (REG02 index 5) bits 4-5 is 0 the PS0-1 bits are compared with these two bits on a pixel per pixel base allowing realtime switching between up to 4 devices ATI 68860/68880 Truecolor DACs: REG08 (R/W): bit 0-? Always 2 ?? REG0A (R/W): bit 0-? Always 1Dh ?? REG0B (R/W): (GMR ?) bit 0-7 Mode. 82h: 4bpp, 83h: 8bpp, A0h: 15bpp, A1h: 16bpp, C0h: 24bpp, E3h: 32bpp (80h for VGA modes ?) REG0C (R/W): Device Setup Register A bit 0 Controls 6/8bit DAC. 0: 8bit DAC/LUT, 1: 6bit DAC/LUT 2-3 Depends on Video memory (= VRAM width ?) . 1: Less than 1Mb, 2: 1Mb, 3: > 1Mb 5-6 Always set ? 7 If set can remove "snow" in some cases (A860_Delay_L ?) ?? AT&T 20c49x,Winbond W82c490 Truecolor DACs: REG06 (R/W): Command Register bit 0 (W82c490, some ATTs) Power Down Enable. If set the DACs and video multiplexers are powered down. The CPU interface is still working. 1 (490,491) In mode 0 this bit when set selects 8bit DACs, when clear 6bit DACs. 2-4 Exists, but appears to have no function ? 5-7 Mode: 0-3: Palette, 4: 15bit (32k) the two bytes are latched on opposite edges of the dotclock (similar to SC11486), 5: 15bit (32k), 6: 16bit (64k), 7: 24bit (16m) Note: This register can also be accessed by reading REG02 4 times, then the next read or write of REG02 will access this register. Any access of REG00, REG01 or REG03 will terminate the access to this register. The register can only be read or written once before the DAC is returned to normal mode (DAC type 4-1r1w). AT&T 20c498,21c498,22c498 Truecolor DACs (Also IC Works?): REG06 (R/W): Command Register bit 0,2 (22c498) Clockmode for Mode 2 (2 8bit pixels/VCLK). 0: Clock < 22.5 MHz, 1: Clock < 45 MHz, 2: Clock >= 45 MHz 1 In palette modes this bit when set selects 8bit DACs, when clear 6bit DACs. 4-7 Mode: 0: 8bit 1VCLK/pixel, 1: 15bit 1VCLK/pixel, 2: 8bit (2 pixels/ VCLK), 3: 16bit 1VCLK/pixel, 5: 24/32bit 2VCLKs/pixel, 6: 16bit 2VCLKs/pixel Note: This register can also be accessed at REG02 by reading REG02 four times, The fifth read will access of 3C6h will access this register. Only one read or write will be allowed (DAC type 4-1r1w2i), the 6th read returns 84h and the 7th returns 98h (don't know about the 20c498). Avance Logic ALG1201 Truecolor DAC: REG06 (R/W): "Hidden Command register" bit 5-7 Mode. 5: 15bit, 6: 16bit, 7: 24bit Note: This register can also be accessed by reading REG02 4 times, then the next read or write of REG02 will access this register. Any access of REG00, REG01 or REG03 will terminate the access to this register. The register can only be read or written once before the DAC is returned to normal mode (DAC type 4-1r1w). BrookTree Bt477: REG06 (R/W): bit 0 DAC powerdown. If set the DAC powers down 1 DAC Width. If set the DAC and palette registers are 8bit wide, if clear only 6bit wide (as std VGA). 5 IRE control ?? seems to affect the output intensity ? BrookTree Bt481/482: REG00 index 0 (R/W): Ind Pixel Mask REG00 index 1 (R/W): Overlay Mask REG00 index 2 (R/W): Command Register B bit 0 Set to power down the DAC (Sleep mode). 1 DAC Width. If set the DAC and palette registers are 8bit wide, if clear only 6bit wide (as std VGA). 2 Sync on Red if set 3 Sync on Green if set 4 Sync on Blue if set 5 Set for 7.5 IRE, clear for 0.0 IRE pedestal (affects DAC range). 6 Enables the Overlay registers if set REG00 index 3 (R/W): Cursor Register (482) bit 0-1 Cursor type. 0: disabled, 1: 3-color, 2: Windows, 3: X11 style 2 Cursor Op disabled if set? 3 If clear reads/writes to REG04,REG05,REG07 will access the cursor palette, if set the cursor pattern data will be accessed instead. 4 Set in interlaced modes 5 Selects External cursor if set REG00 index 4 W(R/W): Cursor X (482) bit 0-11 Cursor X position REG00 index 6 W(R/W): Cursor Y (482) bit 0-11 Cursor Y position Note: the indexed DAC registers are accessed by setting bit 0 of REG06. Then REG00 is the index register and REG02 is the data register. REG04 (R/W): Cursor Write Address (482) bit 0-1? Selects the palette register which will be written at REG05 0: Overscan, 1: Cursor Background, 2: Cursor Foreground REG05 (R/W): Cursor RAM Data (482) bit 0-7 Cursor palette data Note: If REG00 index 3 bit 3 is clear this works like the palette address&data registers at REG00,REG01®03 except that a separate palette is accessed. Each read/write of this register will increment first through the red,green,blue sequence and then the Address register (REG04/REG07). If REG00 index 3 bit 3 is set REG04/REG07 are the lower 8 bits of the index into the 1024 byte palette pattern RAM, which will increment for each access to this register. REG06 (R/W): Command Register A bit 0 If set the Bt481/2 indexed DAC registers can be accessed by setting REG00 to the index and reading or writing the data at REG02. 4-7 Mode. 0: Palette, 8: 15bit (Dual edge), 9: 24bit (Dual edge), Ah: 15bit (32K), Ch: 16bit (Dual edge), Eh: 16bit (64K), Fh: 24bit (16m). The Dual edge modes transfers data on both the rising and falling edges of the pixel clock. Note: This register can also be accessed at REG02 by reading REG02 four times. Then the command register can be read or written at REG02. This access will be terminated by any access to REG00, REG01 or REG03 or after a write to the command register (DAC type 4-Nr1w). REG07 (R/W): Cursor Read Address (482) bit 0-1? Selects the palette register which will be read at REG05 BrookTree Bt484, Bt485, AT&T 20c504/5 Truecolor DACs: The 485 and 505 has the extra register at REG0A and supports 64x64 cursor The 484 & 504 appears to be limited to 110MHz, the 485/505 to 135MHz REG04 (R/W): Cursor/Overscan Write Address bit 0-7 The PEL data register (0..255) to be written to REG05. Note: After writing the 3 bytes at REG05 this register will increment, pointing to the next data register. REG05 (R/W): Cursor/Overscan Data bit 0-5 Color value Note: Each read or write of this register will cycle through first the registers for Red, Blue and Green, then increment the appropriate address register. Note: the registers REG04,REG05,REG07 works like the normal REG00,REG01,REG03 registers, except that a separate set of palette registers (16 overlay registers ?) are being accessed. Index 00h Overscan color 01h Cursor Color 1 (Background) 02h Cursor Color 2 (Foreground) 03h Cursor Color 3 Note: if the DAC is in 6bit mode (REG06 bit 1 is 0) the 2 upper bits of the cursor colors are ignored. REG06 (R/W): Command Reg 0 bit 0 Power Down. If set the DACs and RAM power is turned off, but the RAM still retains data, if clear the RAMDAC is operating normally 1 Set if DAC and palette registers are 8bit DACs, clear if 6bit. 2 Sync on Red if set 3 Sync on Green if set 4 Sync on Blue if set 5 Set for 7.5 IRE pedestal, clear for 0.0 IRE. 6 Disables internal clocking if set 7 (485,505) Enable CR3. If clear the Status register is present at REG0A, if set 3C8h determines which register is present at REG0A: 00h Status Register 01h Command Register 3 REG07 (R/W): Cursor/Overscan Read Address bit 0-7 The PEL data register (0..255) to be read from REG05. Note: After reading the 3 bytes at REG05 this register will increment, pointing to the next data register. REG08 (R/W): Command Reg 1 bit 0 In 15/16bit 1:1 mode selects the pixel port (A-B or C-D) to take pixel data from. Clear for A-B, set for C-D. See bit 1. 1 PORTSEL. In 15bit 1:1 mode (bit 2 set & bit 3 clear), this bit if set causes pin P7D (most significant bit of the C-D port) to select whether the 15bit pixel data is taken from port A-B or port C-D, thus allowing real-time switching between video sources. 2 SPARSE. Set if 16bit data is 1:1, clear if it is muxed 2:1 3 Set in 5/6/5 mode, clear in all other modes 4 If set decodes True-color pixel data (5/5/5, 5/6/5 or 8/8/8 mode), directly, if clear each component (R-G-B) of the pixel data is used is used as a separate index to the palette RAM for the specific RGB component, allowing non-linear scales (gamma correction) for each color-component. REG09 bit 2 controls the indexing. 5-6 Bits per pixel. 0: 24, 1: 15/16, 2: 8, 3: 4 REG09 (R/W): Command Reg 2 bit 0-1 Cursor mode. 0: Disabled, 1: 3-Color, 2: Windows, 3: X11 Style 2 Sparse or Contigous Indexing. In Look-up True-color modes (REG08 bit 4 clear) selects whether each color component is shifted right or left before being used as an index to the palette. If set the pixel data is treated as the least significant bits of the index (Contigous index), if clear as the most significanty bits (Sparse index). 3 Set in interlaced modes (used for the cursor). 4 Selects input clock. 0: PCLK0, 1: PCLK1 5 If clear the dac takes data from the VGA port and each byte is a one byte palette index regardless of the state in Command Register 1, if set pixel data is taken from pixel ports A-D and data format is controlled by Command Register 1 6 Test Path enabled if set. 7 SCLK (Video shift clock) disabled if set. REG0A (R): Status Reg bit 4-7 Product ID ? 4: AT&T20c504, 0Dh: AT&T20c505, 8-Bh: Bt484/5 Note: The two registers at REG0A are selected by bit 7 of REG06. REG0A (R/W): Command Reg 3 (485,505 only) Bit 0-1 Bits 8-9 of the Palette Write Address (3C8h) 2 Set if using 64x64 cursor, clear if 32x32 cursor. 3 If set the Clock Doubler is enabled and the input clock is doubled. Note: The two registers at REG0A are selected by bit 7 of REG06. This register does not exist on the Bt484 REG0B (R/W): Cursor Ram Data bit 0-7 Data port for the Hardware Cursor Map. There are either 2 128byte (32x32bit) or 2 512 byte (64x64bit) maps depending on REG0A bit 2. The first is the cursor image and the second is the cursor shape. To update the cursor map, write the start address to REG00and start writing to this register. The index will increment for each byte. REG0C W(R/W): Hardware Cursor X-position bit 0-11 The X-position of the rightmost pixel of the hardware cursor REG0E W(R/W): Hardware Cursor Y-position bit 0-11 The Y-position of the lower scanline of the hardware cursor Chrontel CH8391 and CH8398: REG04 (R/W): Clock RAM Write Address bit 0-? Selects the register that is writable at REG05. The first write accesses the low byte of the register and the second the high byte. Note: Reading this register 4 times will cause the next access of this register to go to the "Hidden Clock" register. REG04 (R/W): Clock Select Register bit 0-3 Selects the Video Clock. 4-6 Selects the Memory Clock 7 Frequency hold. If set the video and memory clock selects in bits 0-6 are ORed with the actual inputs from the clock select pins Note: This register is accessed6 by reading REG04 4 timers first. REG05 (R/W): Clock RAM Data Register Note: each indexed register addressed here is 16bit wide and thus must be read/written as two bytes, low byte first. REG05 index 00h-0Fh W(R/W): Video Clock Select 0-15 bit 0-7 N. Numerator. Effective value (n) is N+8. The following N values may give unstable output: 0-7, 10-15, 19-23, 28-31, 37-39, 46-47 and 55. 8-13 M. Denominator. Effective value (m) is M+2. It is recommended to use N<11 for best clock performance 14-15 K. Clock Divider. Effective divider (k) is: 0: 1, 1: 2, 2: 4, 3: 8 The resulting clock is: ref*n/(m*k) where ref is the reference clock, usually 14.31818MHz and n,m and k are the effective (as opposed to coded) factors Note: The CH8398 apparently has Video Clock 0 hardcoded as 25.175MHz and Video Clock 1 hardcoded as 28.322. The CH8391 does not. REG05 index 10h-17h W(R/W): Memory Clock Select 0-7 Probably same coding as the Video Clocks. REG06 (R/W): Control Register (CH8391) bit 0 Power Down if set 1 If set the DAC and palette registers are 8bit wide (256 colors of 16Mcolors), if clear 6bit (256 colors of 256K colors) 5-7 Color mode. 0: Palette, 5: 15bit, 6: 16bit, 7: 24bit Note: This register can also be accessed by reading 3C6h 4 times in a row. The 4th read will return the chip ID (B3h for the CH8391) and the 5th read or write will access this register ("1r/w" type Cmd register). REG06 (R/W): Control Register (CH8398) bit 0 Power Down if set 2 Always set ?? 4-7 Color mode. 0: Palette, 1: 15bit, 3: 16bit, 5: 24bit, 6: 16bit, 7: 24bit, 11: 24bit, 12: 15bit Note: This register can also be accessed by reading 3C6h 4 times in a row. The 4th read will return the chip ID (C0h for the CH8398) and the 5th read or write will access this register ("1r/w" type Cmd register). REG07 (R/W): Clock RAM Read Address bit 0-? Selects the register that is readable at REG05. The first read accesses the low byte of the register and the second the high byte. Cirrus Logic 542x/3x internal DAC. - How close is this to the Cirrus Logic CL-GD5200 & Acumos ADAC1 ? REG02 (R/W): Hidden DAC Register bit 0-3 Extended Mode Select. If bit 6 and 7 are both set this field selects the DAC mode: 0: 5-5-5 15bit Sierra HiColor 1: 5-6-5 16bit "XGA" HiColor 5: (5422+) 8-8-8 24bit TrueColor. This mode also exists on the 5420 rev1, but is not documented. 6/7: (5428+) DAC Power-down 8: (5428+) 8bit Greyscale. 9: (5428+) 3-3-2 8bit RGB 4 32K Color Control. If set bit 15 (MSB) of a 15bit pixel selects whether the pixel is HiColor(bit 15 = 0) or palette data(bit 15 = 1, bit 0-7 is the palette index). This bit only has effect in 5-5-5 15bit modes. 5 Clocking Mode. If set Clocking Mode 2 will be selected and data will only be latched on the rising edge of DCLK, if clear Clocking Mode 1 will be selected and data will be latched on both the rising edge (low byte) and falling edge (high byte) of DCLK. This bit only has effect in 15/16 bit modes as all other modes will use Clocking Mode 2. Clocking Mode 1 should only be used for externally supplied DCLK and pixel data. 6 Enable ALL Extended Modes. If bit 7 is set and this bit is clear the DAC is in 5-5-5 15bit Sierra HiColor mode, if both bit 7 and this bit are set bits 0-3 determines the DAC mode. 7 Enable 5-5-5 Mode. If set the DAC is in an advanced mode, depending on the other bits in this register, if clear the DAC is in VGA compatible palette mode. Note: This register is accessed by reading REG02 four times to unlock this register, then the next read or write of REG02 will access this register. After reading or writing this register the register is locked and this register can only be accessed be redoing the 4 reads of REG02 etc. Any access to REG00,REG01,REG03 will also lock this register. The 5428 is the exception where reads of this register will NOT lock it. Note: When REG02 is 0FFh the access to this register described above does x not always work. Note: This register does not exist on the 5401/5402 and the 5420 rev A. IBM RGB514, RGB524, RGB525, RGB528 Truecolor DAC w/PLL: REG04 W(R/W): Index bit 0-? Selects the indexed register that will be accessed by the next read or write of REG06. If REG07 bit 0 is set this index is autoincremented by each access of REG06. REG06 index 00h (R): Rev bit 0-7 Revision. F0h for the RGB524, ? for the RGB514, RGB525,RGB528 REG06 index 01h (R): Id bit 0-7 Chip ID. 2 for the RGB524, ? for the RGB514,RGB525,RGB528 REG06 index 02h (R/W): Misc Clock bit 0 Set for internal (PLL) clock ?? 1 Set for double clock REG06 index 03h (R/W): Sync REG06 index 04h (R/W): Hsync Pos bit 0-3 Hsync Position ? REG06 index 05h (R/W): Power Management REG06 index 06h (R/W): DAC Options bit 1 Fast slew if set ? 3 Sync on Green if set REG06 index 07h (R/W): Palette Control REG06 index 08h (R/W): System Clock (Not RGB525?) REG06 index 0Ah (R/W): Pixel Format bit 0-2 Pixel format. 3: 8bpp, 4: 15/16bpp, 6: 32bpp REG06 index 0Bh (R/W): 8bpp REG06 index 0Ch (R/W): 16bpp bit 1 Set for 16bpp (5:6:5), clear for 15bpp (5:5:5) REG06 index 0Dh (R/W): 24bpp REG06 index 0Eh (R/W): 32bpp REG06 index 10h (R/W): PLL Control 1 bit 0 Set to use 8 internal clocks with separate numerators, clear to use 16 internal clocks with a common numerator (index 14h). 1-2 Set to 1 ?? REG06 index 11h (R/W): PLL Control 2 bit 0-3 Selects the PLL clock used (0-7 if index 10h bit 0 set, 0-15 if it is clear). REG06 index 14h (R/W): PLL Ref Div Fix bit 0-4 N. Numerator. Guess 0 not valid. Used for f0-f15 if index 10h bit 0 is clear. REG06 index 15h W(R/W): Sysclk Ref/VCO Div (Not RGB525) bit 0-4 N. Numerator. Guess 0 not valid REG06 index 16h (R/W): Sysclk VCO Div (Not RGB525) bit 0-5 M. Multiplier. 65-128, Stored as 0-63. 6-7 DF. Divider. 0: /8, 1: /4, 2: /2, 1: /1. (Div=1,2,4,8). Note: Memory Clock. The effective clock is: Ref*(M+65)/(N*Div), where Ref is the reference clock, typ 14.31828MHz and N the numerator from index 15h REG06 index 20h-2Fh (R/W): PLL Clock 0-15 (f0-f15) bit 0-5 M. Multiplier. 65-128, Stored as 0-63. 6-7 DF. Divider. 0: /8, 1: /4, 2: /2, 1: /1. (Div=1,2,4,8). Note: Only active if index 10h bit 0 is clear. The effective clock is: Ref*(M+65)/(N*Div), where Ref is the reference clock, typ 14.31828MHz and N is the Numerator from index 14h. REG06 index 20h-2Eh W(R/W): PLL Clock 0-7 (m0/n0..) bit 0-5 M. Multiplier. 65-128, Stored as 0-63. 6-7 DF. Divider. 0: /8, 1: /4, 2: /2, 1: /1. (Div=1,2,4,8). 8-12 N. Numerator. Guess 0 not valid Note: Only active if index 10h bit 0 is set. The effective clock is: Ref*(M+65)/(N*Div), where Ref is the reference clock, typ 14.31828MHz REG06 index 30h (R/W): "Cursor Control" bit 0-1 Cursor type. 0: Disabled, 2: Windows?, 3: X11 cursor 2 Set for 64x64 cursor, clear for 32x32 cursor 3 5 Set for ?? REG06 index 31h W(R/W): "Cursor X position" bit 0-? The horizontal position of the hardware cursor REG06 index 33h W(R/W): "Cursor Y position" bit 0-? The vertical position of the hardware cursor REG06 index 35h (R/W): Cursor Hot-Spot X REG06 index 36h (R/W): Cursor Hot-Spot Y REG06 index 40h (R/W): Cursor Color1 Red bit 0-7 Red component of the Cursor Color1. REG06 index 41h (R/W): Cursor Color1 Green bit 0-7 Green component of the Cursor Color1. REG06 index 42h (R/W): Cursor Color1 Blue bit 0-7 Blue component of the Cursor Color1. REG06 index 43h (R/W): Cursor Color2 Red bit 0-7 Red component of the Cursor Color2. REG06 index 44h (R/W): Cursor Color2 Green bit 0-7 Green component of the Cursor Color2. REG06 index 45h (R/W): Cursor Color2 Blue bit 0-7 Blue component of the Cursor Color2. REG06 index 46h (R/W): Cursor Color3 Red bit 0-7 Red component of the Cursor Color3. REG06 index 47h (R/W): Cursor Color3 Green bit 0-7 Green component of the Cursor Color3. REG06 index 48h (R/W): Cursor Color3 Blue bit 0-7 Blue component of the Cursor Color3. REG06 index 60h (R/W): Border Color Red bit 0-7 Red component of the Border Color. REG06 index 61h (R/W): Border Color Green bit 0-7 Green component of the Border Color. REG06 index 62h (R/W): Border Color Blue bit 0-7 Blue component of the Border Color. REG06 index 70h (R/W): Miscellaneous 1 bit 6 REG06 index 71h (R/W): Miscellaneous 2 bit 0 2 If set DACs & LUTs are 8bit wide, if clear only 6bits wide REG06 index 72h (R/W): Miscellaneous 3 REG06 index 73h (R/W): Miscellaneous 4 (Not RGB525) REG06 index 82h (R/W): DAC Sense REG06 index 84h (R/W): Misc Red REG06 index 86h (R/W): Misc Green REG06 index 88h (R/W): Misc Blue REG06 index 8Eh (R/W): PLL VCO Div In REG06 index 8Fh (R/W): PLL Ref Div In REG06 index 90h (R/W): VRAM Mask 0 REG06 index 91h (R/W): VRAM Mask 1 REG06 index 92h (R/W): VRAM Mask 2 REG06 index 93h (R/W): VRAM Mask 3 REG06 index 100h-4FFh (R/W): "Cursor Data" Note: The cursor map is either a 64x64x2 (1024 bytes) or 32x32x2 (256bytes). The map data is stored with upper lines first, left pixels first. Each byte holds 4 pixels, with lowest pixel in bits 0-1 and highest on 6-7. High bit: Low bit: Resulting Screen data: 0 0 0 1 1 0 Screen data 1 1 REG07 (R/W): Index Control bit 0 If set the index at REG04 is autoincremented by each access of REG06 ICS 5301: REG06 (R/W): "Hidden DAC register" bit 0-1 Power down if set ?? 2-4 Always 0 5-7 Mode. 1,4,5: 15bit, 3,6: 16bit, 2,7: 24bit Note: This register can be accessed by reading REG02 4 times, then the next read or write of REG02 will access this register. Any access of REG00, REG01 or REG03 will terminate the access to this register. The register can only be read or written once before the DAC is returned to normal mode (DAC type 4-1r1w). IC Works W30c498, W30c516 Truecolor DACs: REG06 (R/W): Command Register bit 0,2 (?) Clockmode for Mode 2 (2 8bit pixels/VCLK). 0: Clock < 22.5 MHz, 1: Clock < 45 MHz, 2: Clock >= 45 MHz 1 In palette modes this bit when set selects 8bit DACs, when clear 6bit DACs. 4-7 Mode: 0: 8bit 1VCLK/pixel, 1: 15bit 1VCLK/pixel, 2: 8bit (2 pixels/ VCLK), 3: 16bit 1VCLK/pixel, 5: 32bit 2VCLKs/pixel, 6: 16bit 2VCLKs/pixel, 10: 15bit 2VCLKs/pixel Note: This register can also be accessed at REG02 by reading REG02 four times The fifth read will access of 3C6h will access this register. Only one read or write will be allowed (DAC type 4-1r1w3i), the 6th read returns 84h, the 7th returns 98h and the 8th read returns 4Fh (at least for the w30c516). MUSIC MU9c1880 and Diamond SS24 Truecolor DACs: REG06 (R/W): Command Register bit 0,6 Red Byte Position Shift. In 24bit mode delays the fetching of the first pixel of each scanline by 1 or 2 bytes to synchronize with the start of the first pixel. 0: no delay, 1: delay 1 byte, 2: delay 2 bytes 1-3,5 Selects the Hi- or Truecolor mode. 8: 15bit (5-5-5) HiColor, 0Bh: 16bit (5-6-5) HiColor, 7: 24bit Truecolor (Red byte first). 4 Pixel Mode Switch. In 15bit mode when this bit is set, the most significant bit of each 16bit pixel whether that pixel should be displayed as HiColor (bit 15=0) or Pseudo Color (bit 15=1). If this bit clear all pixels are displayed as HiColor This bit should be clear in 16bit mode and set in 24bit mode. 7 If clear the DAC is in Pseudo Color mode, all other bits in this register are ignored, if set it is in a Hi- or Truecolor mode (15,16 or 24 bits/pixel). Note: This register can also be accessed at REG02 by reading REG02 four times, The fifth read will return 8Eh (the ID for the MU9c1880/SS24) and then the next read or write of 3C6h will access this register. Only one read or write will be allowed (DAC type 5i-1r1w). MUSIC MU9c4870 High Color(?) DAC MUSIC MU9c4910 True Color DAC. MUSIC MU9c9910 True Color DAC & Clock Generator. REG04 (R/W): PLL Write Index Register (9910 only) bit 0-3 Selects the index register which will be accessed by the next write to REG05. REG05 (R/W): PLL Data Register (9910 only) The PLL registers accessed at this register are indexed via REG04 (writes) and REG07 (reads). All (?) are two byte registers which are accessed via two reads or writes (low byte first) each of the indexes have an internal flip-flop to track low/high byte. Each read of REG05 will increment the read index (with the flip-flop incremented first). Writes increment the write index (REG04) similarly. REG05 index 00h - 07h W(R/W): f0-f7 PLL Parameters bit 0-6 M. Numerator. 8-11 N1. Quotient. Prescales REF for the PLL. 12-13 N2. Clock divider. Divides the output clock by: 0: /1, 1: /2, 2: /4, 3: /8 Resultant clock is: REF*(M+1)/((N1+1)*(2^N2)), where REF is the reference clock, typically 14.31818MHz. REG06 (R/W): Command Register bit 0 Powers down the DAC if set 5-7 Mode. 5: 15bit, 6: 16bit, 7: 24bit Note: This register can be accessed by reading REG02 3 times, then the fourth read will return the device ID and then the next read or write of REG02 will access this register. Any access of REG00, REG01 or REG03 or writes to REG02 will terminate the access to this register, however reading of REG02 will not (DAC type 4i-1wNr). The MU9c9910 has ID 44h, the MU9c4910 has ID 82h, the MU9c4870 ?? REG07 (R/W): PLL Read Index Register (9910 only) bit 0-3 Selects the index register which will be accessed by the next read to REG05. MUSIC MU9c9750 Low Power SYNDAC: REG04 (R/W): PLL Write Address Register bit 0-3 Selects the index register which will be accessed by the next write to REG05. REG05 (R/W): PLL Parameters The PLL registers accessed at this register are indexed via REG04 (writes) and REG07 (reads). As all but index 0Eh are two byte registers which are accessed via two reads or writes (low byte first) each of the indexes have an internal flip-flop to track low/high byte. Each read of REG05 will increment the read index (with the flip-flop incremented first). Writes increment the write index (REG04) similarly. REG05 index 00h - 07h W(R/W): CLK0 f0-f7 PLL Parameters bit 0-6 M. Numerator. 8-11 N1. Quotient. Prescales REF for the PLL. 12-13 N2. Clock divider. Divides the output clock by: 0: /1, 1: /2, 2: /4, 3: /8 14-15 PLL Mode Select. 0: Normal PLL mode - the output frequency is calculated as: f=REF*(M+1)/((N1+1)*(2^N2)), 1: High-resolution Low-frequency mode - same as PLL mode, but the output clock is divided by 1024, 2: OFF - The output is set HIGH, 3: Low-resolution Low-frequency mode - Output clock is: f=REF/((M+1)*(2^N2)) REF is the reference clock, typically 14.31818MHz. For best results the following constraints should be observed: REF should be in the 5MHz - 32Mhz range. REF/(N1+1) should be in the 2MHz - 16MHz range (for REF=14.31818MHz N1 should be in the range 1-6) and REF*(M+1)/(N1+1) should be in the 40MHz to 80MHz range. REG05 index 08h W(R/W): CLK0 fL0 PLL Parameters Defines the CLK0 output when in LCD mode. Same format as index 0-7 REG05 index 09h W(R/W): CLK0 fD0 PLL Parameters Defines the CLK0 output when in Dormant mode. Same format as index 0-7 REG05 index 0Ah W(R/W): CLK1 fA PLL Parameters Defines the CLK1 output when in CRT mode and bit 4 of the PLL Control Register (index 0Eh) is clear. Same format as index 0-7 REG05 index 0Bh W(R/W): CLK1 fB PLL Parameters Defines the CLK1 output when in CRT mode and bit 4 of the PLL Control Register (index 0Eh) is set. Same format as index 0-7 REG05 index 0Ch W(R/W): CLK1 fL1 PLL Parameters Defines the CLK1 output when in LCD mode. Same format as index 0-7 REG05 index 0Dh W(R/W): CLK1 fD1 PLL Parameters Defines the CLK1 output when in Dormant mode. Same format as index 0-7 REG05 index 0Eh (R/W): PLL Control Register bit 0-2 CLK0 Select. Selects the CLK0 output in CRT mode (f0 - f7). 4 CLK1 Select. Selects the CLK1 output in CRT mode. 0: fA, 1: fB 5 CLK0 External Select Enable. If clear the CLK0 definition (f0-f7) is selected by the CS0-CS2 inputs, if set it is selected by bits 0-2 of this register 6 CLK0 Master Powerdown. If set the CLK0 PLL is powered down and the output is set HIGH. 7 CLK1 Master Powerdown. If set the CLK1 PLL is powered down and the output is set HIGH. REG06 (R/W): Command Register bit 0 LCD mode enable. If set the DAC goes into LCD mode where video flow through the DACs is stopped and the palette RAM is only accessed to service uP read/writes. The clocks CLK0,CLK1 are forced to the state defined in fL0/fL1 regardless of the state of the PLL Control register. The internal state of registers and palette RAM is maintained. See note 6 Dormant Mode enable. If set the DAC goes into Dormant mode where the video flow though the DACs and the uP interface is stopped. The clocks CLK0,CLK1 are forced to the state defined in fD0/fD1 regardless of the state of the PLL Control register. The internal state of registers and palette RAM is maintained. See note Note: The CRT, LCD and Dormant modes are selected by a combination of the bits in this register and the PD0,PD1 input pins (x is don't care): PD1: PD0: Bit 6: Bit 0: Mode: DAC: RAM Access: CLK0: CLK1: 1 0 0 0 CRT On Video&uP f0-f7 fA,fB x 1 0 0 LCD Off uP fL0 fL1 1 0 0 1 LCD Off uP fL0 fL1 0 0 x x Dormant Off None fD0 fD1 x x 1 x Dormant Off None fD0 fD1 Setting PD1=1 and PD0=0 allows full control from this register REG07 (R/W): PLL Read Address Register bit 0-3 Selects the index register which will be accessed by the next read to REG05. Oak OTI-66HC HiColor DAC: REG06 (R/W): "Hidden" Command Register bit 0 If set the DAC powers down 5-7 DAC mode. 5: 15bit, 6: 16bit Note: This register can be accessed by reading REG02 4 times, then the next read or write of REG02 will access this register. Any access of REG00, REG01 or REG03 or writes to REG02 will terminate the access to this register, however reading of REG02 will not (DAC type 4-1wNr). S3 86c708 (GenDac aka ICS5342) and 86c716 (SDAC aka ICS5300). REG02 (R): "Hidden DAC" register (86c716) Bit 4-7 7 for the 86c716. Note: This is a special register overlaying the PEL register activated by an internal counter. Each access to 3C7h-3C9h resets the counter and each access to 3C6h increments it. When the counter reaches 4 this register is returned. The fifth read returns another register REG04 (R/W): PLL Write Register bit 0-7 Controls the indexed register written at REG05. Each indexed register holds two bytes at the same index. Autoincremented after every two writes of REG05. REG05 index 00h W(R/W): f0 PLL M & N1/M2 divider bit 0-6 M. Quotient. Stored as 1-127, actual value 3-129 8-12 N1. Frequency divider. Stored as 1-31, actual value 3-33 13-15 N2. Divides the frequency. 0: /1, 1: /2, 2: /4, 3: /8 Note: Defines the frequency generate when clock 0 is selected Note: See index 02h for details Possibly hardwired to 25.175MHz REG05 index 01h W(R/W): f1 PLL M & N1/M2 divider bit 0-6 M. Quotient. Stored as 1-127, actual value 3-129 8-12 N1. Frequency divider. Stored as 1-31, actual value 3-33 13-15 N2. Divides the frequency. 0: /1, 1: /2, 2: /4, 3: /8 Note: Defines the frequency generate when clock 1 is selected Note: See index 02h for details Possibly hardwired to 28.322MHz REG05 index 02h W(R/W): f2 PLL M & N1/M2 divider bit 0-6 M. Quotient. Stored as 1-127, actual value 3-129 8-12 N1. Frequency divider. Stored as 1-31, actual value 3-33 13-15 N2. Divides the frequency. 0: /1, 1: /2, 2: /4, 3: /8 Note: Defines the frequency generate when clock 2 is selected Note: Frequency is (M/N1)/(1 << N2) *base frequency.M and N1 are the actual values, not the stored ones. Typically the base frequency is 14.318 MHz. REG05 index 03h W(R/W): f3 PLL M & N1/M2 divider bit 0-6 M. Quotient. Stored as 1-127, actual value 3-129 8-12 N1. Frequency divider. Stored as 1-31, actual value 3-33 13-15 N2. Divides the frequency. 0: /1, 1: /2, 2: /4, 3: /8 Note: Defines the frequency generate when clock 3 is selected Note: See index 02h for details REG05 index 0Ah W(R/W): Memory Clock bit 0-6 M. Quotient. Stored as 1-127, actual value 3-129 8-12 N1. Frequency divider. Stored as 1-31, actual value 3-33 13-15 N2. Divides the frequency. 0: /1, 1: /2, 2: /4, 3: /8 Note: Defines the frequency generate for the memory clock Note: See index 02h for details REG05 index 0Eh W(R/W): PLL Control REG06 (R/W): Enhanced Command Register bit 4-7 Mode: 0: Palette (1 pixel/VCLK), 1: Palette (2 pixels/VCLK), 2: 15bit (2 VCLKs/pixel), 3: 15bit (1 VCLK/pixel), 4: 24bit (3 VCLKs/pixel) - GenDAC only?, 5: 16bit (1 VCLK/pixel), 6: 16bit (2 VCLKs/pixel), 7: 32bit (2 VCLKs/pixel), 0Eh: 24bit (3 VCLKs/pixel) REG07 (R/W): PLL Read Register bit 0-7 Controls the indexed register read from REG05. Each indexed register holds two bytes at the same index. Autoincremented after every two reads of REG05. SGS-Thompson STG1700/2/3 Truecolor DACs: All the STG DACs have 16bit pixel data path, but the 1700 can not use the packed 24bit mode where 2 pixels are transferred in 3 pixel clocks. The 1703 has built-in clock generator. REG04 (R/W): Index Low bit 0-7 Index for the register accessible via REG05. The high byte (always 0) is in REG07. REG05 (R/W): Indexed Register There are a series of indexed registers in the STG DACs. If REG06 bit 4 is set they are accessed by the two index bytes to REG02 and then reading or writing the indexed registers at REG02 (index will autoincrement). If REG06 bit 4 is clear the index is written to REG04 & REG07 and the indexed register are read or written at REG05. REG05 index 00h (R): Company ID bit 0-7 44h for SGS-Thompson, 97h for ?? REG05 index 01h (R): Device ID bit 0-7 00h for STG1700, 02h for STG1702, 03h for STG1703 REG05 index 02h (R/W?): bit 0-7 A1h ?? REG05 index 03h (R/W?): Primary Pixel Mode bit 0-7 Mode (this register only active if REG06 bit 3 set): 2: 15bit 1VCLK per pixel 3: 16bit 1VCLK per pixel 4: 24bit 2VCLKs per pixel (2x 16bit -> 1x 24bit) 5: 8bit 1/2 VCLKs per pixel (ie. 16bit -> 2x 8bit) 9: (not 1700) 24bit 3/2 VCLKs per pixel (3x 16bit -> 2x 24bit) REG05 index 04h (R/W?): Secondary Pixel Mode bit 0-7 same as index 3 ?? REG05 index 05h (R/W?): PLL Control bit 0-7 02h - for double clocking (16bit) ??? REG05 index 06h (R/W?): bit 0-7 00h ?? REG05 index 07h (R/W?): bit 0-7 88h ?? REG05 index 20h W(R/W): bit 0-7 B. Quotient 8-12 N1. Frequency divider. 13-15 Divider (D). 0: /1, 1: /2, 2: /4, 3: /8 The effective clock is: Ref*D*(B+2)/(N1+2). Ref is the reference clock, typically 14.31818MHz REG06 (R/W): Pixel Command Register bit 0 Power down the DAC if set 1 Set to get 8bit DACs in 256color mode, clear to get normal 6bit DACs 2 Controls intensity ?? 3 If set the DAC is controlled by the indexed registers below. 4 When set puts the dac into indexed mode, now write the index (2 bytes) to this register, then each access to this register will read or write the particular indexed register and increment the index. This is the same index as in REG04/REG07. 5-7 Selects the Hi/True color mode: 0: Standard (16/256color), 5: 15bit(32K), 6: 16bit(64K), 7: 24bit(16m) Note: This register can be accessed by reading REG02 4 times, then the next read or write of REG02 will access this register. Any access of REG00, REG01 or REG03 will terminate the access to this register, The register can only be read or written once per unlock sequence (DAC type 4-1w1r). REG07 (R/W): Index High bit 0-? High byte of the index in REG04. 0 for all current registers. Sierra SC15021,25/6 Truecolor DACs: The SC15021 supports 16bit pixel data path. REG04 (R/W): Overlay Write Address REG05 (R/W): Overlay Data REG06 (R/W): Command Register bit 1-2 EXT mode select ? 3 Gamma Correction enabled if set? 4 If set 3C7h is the index port and 3C8h the data port for an extra register, also this register is then accessible directly at 3C6h. 0,5-7 Mode: 00h Palette modes 04h 32bit RGBx (red first) "double clocked" - pixel data on both rising and falling edge of the dotclock 05h 32bit BGRx (blue first) "double clocked" 06h 24bit RGB/32bit RGBx (red first) 07h 24bit BGR/32bit BGRx (blue first) 08h 15bit (32K colors) "double clocked" 09h 15bit (32K colors) "EXT" "double clocked" 0Ah 15bit (32K colors) 0Bh 15bit (32K colors) "EXT" 0Ch 16bit (64K colors) "double clocked" 0Eh 16bit (64K colors) Note: This register can be accessed by reading REG02 4 times, then the next read or write of REG02 will access this register. Any access of REG00, REG01 or REG03 or writes to REG02 will terminate the access to this register, however reading of REG02 will not (DAC type 4-1wNr). REG06 index 8 (R/W): Auxiliary Control bit 0 DAC and palette register width in palette modes. Set for 8bit and clear for 6 bit 1 PED 75 IRE. 2 Power Down. REG06 index 9 (R): ID1 bit 0-7 53h ('S') REG06 index 0Ah (R): ID2 bit 0-7 Version code. 0/36h/3Ah REG06 index 0Bh (R): ID3 bit 0-7 B1h for the SC15025/26, ACh for the SC15021 REG06 index 0Ch (R): ID4 bit 0-7 41h REG06 index 0Dh (R/W): Pixel Mask Low bit 0-7 ANDed with the pixel data, Low byte. Should normally be FFh. REG06 index 0Eh (R/W): Pixel Mask Middle bit 0-7 ANDed with the pixel data, Middle byte. Should normally be FFh. REG06 index 0Fh (R/W): Pixel Mask High bit 0-7 ANDed with the pixel data, High byte. Should normally be FFh. REG06 index 10h (R/W): Pixel Repack bit 0 (15025/6) Set for 4x 8bit -> 1x 24bit, clear for 1x 8bit -> 8bit, 2x 8bit -> 1x 16bit or 3x 8biot -> 1x 24bit 0-3 (15021) Packaging: 2: 8bit -> 2x4bit, 4: 16bit -> 2x8bit, 5: 3x16bit -> 2x24bit (2/3 clock), 6: 2x16bit -> 24bit (1/2 clock), 8: 16bit -> 16bit (alternate?), 0: all others REG06 index 11h (R/W): Cursor (15021) bit 0-2 Cursor Delay. 0: None, 4: +1, 5: +2, 6: -1, 7: -2 3-4 Cursor type. 0: disabled, 1: 3 colors, 2: 2 color MS-Windows style, 3: 2 color X11 style 7 Cursor Polarity REG06 index 12h (R/W): Secondary Control (15021) bit 0-1 Mix control: 1: 8 -> 16 MixA or 8 -> 15 MixB, 2: 8 -> 16 MixB or 8 -> 15 MixA, 0 for all others. REG07 (R/W): Overlay Read Address Trident TKD8001 24bit DAC (also 9200CXr,9400CXi,9420DGi internal DAC): REG06 (R/W): Command Register 0 (not 9200) Power down DAC if set ? 1 (not 9400) In mode 0 this bit when set selects 8bit DACs, when clear 6bit DACs. Should be set in 24bit mode, clear in 15/16 bit modes ? 5-7 Mode: 0: Palette (16/256), 5: 15bit (32k), 7: 16bit (64k), 6: 24bit (16m colors) bit 2 should be set in this mode Note: This register can also be accessed at REG02 by reading REG02 four times. Then the command register can be read or written at REG02. This access will be terminated by any access to REG00, REG01 or REG03 or after a write to the command register (DAC type 4-Nr1w). Trident 9440AGi internal 24bit DAC: REG06 (R/W): Command Register 2 If set in the 15/16/24 bit modes pixels with the most significant bit set appears to be displayed as if in palette mode ? 4-7 Mode: 1: 15bit (32k), 3: 16bit (64k), 0Dh: 24bit (16m colors) All other values appears to default to palette mode Note: This register can also be accessed at REG02 by reading REG02 four times. Then the command register can be read or written at REG02. This access will be terminated by any access to REG00, REG01 or REG03 or after a write to the command register (DAC type 4-Nr1w). TI TLC34058, Brooktree Bt458 DACs These DACs are intended for high bandwidth systems and are not VGA compatible. They use 4 or 5 separate pixel ports in parallel for higher bandwidth REG04 (R/W) Index Register. bit 0-7 Index for accesses through 3C6h, 3C7h and 3C9h. For 3C7h and 3C9h there is also an internal counter for the (Red, Green and Blue) cycle. This counter is reset when this register is written. Each access to 3C7h or 3C9h will increment first the RGB counter and then this register. REG05 (R/W) Palette Data bit 0-7 Palette data port. 3C8h selects the entry in the palette RAM. Each read or write of this register increments index, first through the Red, Green & Blue and then increments register 3C8h REG06 (R/W) Control Data. bit 0-7 Data port for the Control registers. 3C8h is the index. Unlike 3C7h and 3C9h the index in 3C8h is not increased by reads and writes of this register REG06 index 4 (R/W): Read Mask Register bit 0-7 The pixel data is ANDed with this byte before being passed to the palette RAM. This is similar to 3C6h in standard VGA systems. REG06 index 5 (R/W): Blink Mask Register bit 0-7 In the blink off period the pixel data is ANDed with the inverse of this register, Ie. the '0' bits in this register will protect the corresponding bits of the pixel data from blinking, while '1' bits will force the corresponding pixel data bits low during the blink off period. REG06 index 6 (R/W): Command Register bit 0 OL0 Display Enable. If clear the overlay pin 0 (OL0) is forced to 0 1 OL1 Display Enable. If clear the overlay pin 1 (OL1) is forced to 0 2 OL0 Blink Enable. If set (and bit 0 set) the overlay pin 0 toggles between 0 and the actual value at the blink rate 3 OL1 Blink Enable. If set (and bit 1 set) the overlay pin 1 toggles between 0 and the actual value at the blink rate 4-5 Blink Rate Select. Selects the blink rate in vertical periods: 0: 16on/48off, 1: 16on/16off, 2: 32on/32off, 3: 64on/64off 6 RAM Enable. If the overlay select pins (OL0-1) are 0 this bit selects the output. Set for palette RAM data, clear for overlay register 0. 7 Multiplex Select. Set for 5:1 multiplexing, clear for 4:1 multiplexing - pixel port E is ignored and should be tied low REG06 index 7 (R/W): Test Register bit 0-3 Selects the data to be returned in bit 4-7 when reading this register. Selects upper or lower 4 bits of one of the 3 DAC inputs: 1: return 4MSB of Red 9: return 4LSB of Red 2: return 4MSB of Green 10: return 4LSB of Green 4: return 4MSB of Blue 12: return 4LSB of Blue 4-7 (R) Data selected by bits 0-3 REG07 (R/W) Overlay Data bit 0-7 Overlay data port. 3C8h selects the entry in the overlay RAM (0-3). Each read or write of this register increments index, first through the Red, Green & Blue and then increments register 3C8h TI TLC34075, ATI68875 True color DACs This DAC has an 8bit VGA port and a 32bit pixelport (P). The 32bit pixelport P can be multiplexed for greater bandwidth. 6 or 8 bit DACs can be controlled via the 8/6 pin (low=6bit, high=8bit). REG08 (R/W): General Control Register bit 0 If set HSYNCOUT is active high, active low if clear 1 If set VSYNCOUT is active high, active low if clear 2 Enables split shift register transfer (VRAM) if set 3 Enables special nibble mode if set 4 Pedestal Enable Control. Set for a 7.5 IRE pedestal, clear for a 0 IRE pedestal 5 Sync Enable Control. If set enables sync on green. 7 MUXOUT. If set the MUXOUT output pin is high, low if clear Note: bits 2 and 3 can not both be set. REG09 (R/W): Input Clock Selection Register bit 0-3 Selects the clock source (DOTCLK): 0: CLK0, 1: CLK1, 2: CLK2, 3: CLK3 (TTL), 4: /CLK3 (TTL) 8: CLK3 and /CLK3 are selected as an ECL clock source REG0A (R/W): Output Clock Selection Register bit 0-2 Selects SCLK from DOTCLK. 0: SCLK=DOTCLK, 1: SCLK=DOTCLK/2, 2: SCLK=DOTCLK/4 3: SCLK=DOTCLK/8, 4: SCLK=DOTCLK/16, 5: SCLK=DOTCLK/32 6,7: SCLK held at logic low 3-5 Selects VCLK from DOTCLK. 0: VCLK=DOTCLK, 1: VCLK=DOTCLK/2, 2: VCLK=DOTCLK/4 3: VCLK=DOTCLK/8, 4: VCLK=DOTCLK/16, 5: VCLK=DOTCLK/32 6,7: VCLK held at logic high REG0B (R/W): MUX Control Register bit 0-5 Selects bits/pixel, pixel port and multiplexing: 0Dh 24bpp from P. Red=P8-15, Green=P16-23, Blue=P24-31 10h 1bpp. 4 pixels/DOTCLK from P0-3 11h 1bpp. 8 pixels/DOTCLK from P0-7 12h 1bpp. 16 pixels/DOTCLK from P0-15 13h 1bpp. 32 pixels/DOTCLK from P0-31 14h 2bpp. 2 pixels/DOTCLK from P0-3 15h 2bpp. 4 pixels/DOTCLK from P0-7 16h 2bpp. 8 pixels/DOTCLK from P0-15 17h 2bpp. 16 pixels/DOTCLK from P0-31 18h 4bpp. 1 pixel/DOTCLK from P0-3 19h 4bpp. 2 pixels/DOTCLK from P0-7 1Ah 4bpp. 4 pixels/DOTCLK from P0-15 1Bh 4bpp. 8 pixels/DOTCLK from P0-31 1Ch 8bpp. 1 pixels/DOTCLK from P0-7 1Dh 8bpp. 2 pixels/DOTCLK from P0-15 1Eh 8bpp. 4 pixels/DOTCLK from P0-31 1Fh 4bpp. 4 pixels/DOTCLK from P0-31 (Special Nibble mode) If the NFLAG input is low the 4 pixels are from P0-3, P8-11, P16-19, P24-27 if high from P4-7, P12-15, P20-23, P28-31 2Dh 8bpp from VGA port REG0C (R/W): Palette Page Register bit 0-7 For 1,2 and 4 bits/pixel modes the upper bits of this register are used to select 1 of 128, 64 and 16 pages respectively in the palette RAM. The pixel data selects the entry within the page. REG0E (R/W): Test Register bit 0-2 (W) Test mode. Selects the current test mode. Reading this register will step to the next test (see Next below). Val: Next: Description: 0 1 Read Color Palette Red value 1 2 Read Color Palette Green value 2 0 Read Color Palette Blue value 3 0 Read Identification code. Returns 75h for 34075 4 5 Read Ones Accumulation Red value 5 6 Read Ones Accumulation Green value 6 4 Read Ones Accumulation Blue value 7 7 Analog Test. Result specified below. 3 (R) Analog Test result. Set if the voltage selected by bit 6 (Green) or bit 7 (Red) is larger than the one selected by bit 4 (145mV reference) or bit 5 (Blue), clear if not. 4 Select 145mV reference if set. Only applies to Analog test (bit 0-2 = 7) 5 Select Blue DAC if set. Only applies to Analog test (bit 0-2 = 7) 6 Select Green DAC if set. Only applies to Analog test (bit 0-2 = 7) 7 Select Red DAC if set. Only applies to Analog test (bit 0-2 = 7) REG0F (W): Reset State Note: Writing to this register will cause a hardware reset of the DAC. TI Viewpoint TVP3010,TVP3020,TVP3025,TVP3026 DACs Note: The TVP3010, TVP3020 and TVP3025 use 3 address lines to select 8 direct registers (REG00-REG07) while the TVP3026 uses 4 lines to select 16 direct registers (REG00-REG0F). The indexed registers (called REG06 index XXh) are also handled differently REG06 (R/W): Index Register bit 0-7 Index port to the indexed registers. First set this register, then read or write REG07 Note: On the TVP3026 the index is written to REG00 and data is read or written to/from REG0A REG06 index 00h W(R/W): Cursor X Position bit 0-11 Horizontal position of the cursor REG06 index 02h W(R/W): Cursor Y Position bit 0-11 Vertical position of the cursor REG06 index 04h (R/W): Sprite Origin X REG06 index 05h (R/W): Sprite Origin Y REG06 index 06h (R/W): Cursor Control bit 4 X Window Mode if set 6 Sprite Enable if set 7 (3025) Planar Access. Set for Bt485 mode, clear for 3020 mode REG06 index 08h W(R/W): Cursor RAM Address bit 0-15 Index into the cursor RAM on the DAC. Data is read or written at index 0Ah. Each access to index 0Ah will autoincrement this register REG06 index 0Ah (R/W): Cursor RAM Data bit 0-7 Cursor data. Reading or writing this register will access the location in Cursor RAM specified in index 8 and will increment that index to allow consecutive reads or writes. The cursor is stored as a 64x64x2 bitmap with 4 2bit pixels per byte The two bits are interpreted as: High (odd) Low (even) ix 6 bit 4=1 ix 6 bit 4=0 bit bit X11 mode "normal" 0 0 Transparent Color 0 0 1 Transparent Color 1 1 0 Color 0 Transparent 1 1 Color 1 Inverse screen (XOR) Color 0 is the color in index 23h-25h, Color 1 is the color in index 26h-28h REG06 index 0Eh (R/W): True Color Control (3025) bit 0 8bit mode?. 0: 16/32bit, 1: 4/8bit 1 Non-VGA mode. Set for non-VGA mode, clear for VGA mode 2 BTmode. Set for Bt485 mode, clear for TI3020 mode REG06 index 0Fh (R/W): VGA Switch Control (3025) REG06 index 10h W(R/W): Window Start X REG06 index 12h W(R/A): Window Stop X REG06 index 14h W(R/W): Window Start Y REG06 index 16h W(R/W): Window Stop Y REG06 index 18h (R/W): MUX Control 1 bit 0-2 (3020) Direct Color mode. 3: Selects 6-6-4 16bit mode (6red-6green-4blue). 4: Selects 5-5-5 15bit mode (5red-5green-5blue). 5: Selects 5-6-5 16bit mode (5red-6green-5blue). 6: Selects 8-8-8 24bit mode (8red-8green-8blue). 0-3 (3025) Direct Color mode 0Ch: Selects 5-5-5 mode (5red-5green-5blue). 0Dh: Selects 5-6-5 mode (5red-6green-5blue). 0Eh: Selects 8-8-8 mode (8red-8green-8blue). 6 (3025) D/T mode. 0: Selects "D" mode, 1: selects "T" mode. 7 Pseudo Color, set for palette modes REG06 index 19h (R/W): MUX Control 2 REG06 index 1Ah (R/W): Input Clock Select bit 0 (3020) If set selects ICLK1, if clear ICLK0 0-2 (3025) Selects the input clock. 0: ICLK0, 1: ICLK2, 2: ICLK2, 3: ICLK2_I ?, 4: ICLK2_E ? 5: PLL as input clock. 4 If set doubles the selected input clock. REG06 index 1Bh (R/W): Output Clock Select bit 0-1 Multiplex. 0: (R1), 1: 1:2 Mux (1x64 -> 2x 24/32bit) R2, 2: 1:4 Mux (1x64 -> 4x 15/16bit) R4, 3: 1:8 Mux (1x64 -> 8x 8bit) R8 3-4 Clock range. 0: <=60MHz (V1), 1: >60MHz & <=120MHz (V2), 2: >120MHz (V4), 3: V8 6 S ? 7 (3025) NS ? Note: Set to 3Eh in VGA passthrough mode REG06 index 1Ch (R/W): Palette Page REG06 index 1Dh (R/W): General Control bit 0 Vertical Sync Polarity. 0: Negative, 1: Positive 1 Horizontal Sync Polarity. 0: Negative, 1: Positive 5 Sync on Green if set REG06 index 1Eh (R/W): Misc Control (3025) bit 0 Powerdown 1 Dotclock disable 2 Internal 6/8 Control. If set selection of 6 or 8 bits DAC mode in palette modes is done by bit 3, if clear from the 6/8 input pin. 3 8Bpp. If set selects 8bit DAC and palette registers in palette modes, if clear selects 6bit DAC & registers. This bit only active if bit 2 is set. 5 VCLK Polarity. 6 LCLK Latch. 0: VCLK 7 Loop PLL RCLK. REG06 index 20h (R/W): Overscan Color Red REG06 index 21h (R/W): Overscan Color Green REG06 index 22h (R/W): Overscan Color Blue REG06 index 23h (R/W): Cursor Color 0 Red bit 0-7 The red component of the cursor background color. REG06 index 24h (R/W): Cursor Color 0 Green bit 0-7 The green component of the cursor background color. REG06 index 25h (R/W): Cursor Color 0 Blue bit 0-7 The blue component of the cursor background color. REG06 index 26h (R/W): Cursor Color 1 Red bit 0-7 The red component of the cursor foreground color. REG06 index 27h (R/W): Cursor Color 1 Green bit 0-7 The green component of the cursor foreground color. REG06 index 28h (R/W): Cursor Color 1 Blue bit 0-7 The blue component of the cursor foreground color. REG06 index 29h (R/W): Auxillary Control bit 0 Window Complement if set 3 (3020) Self Clock mode if set REG06 index 2Ah (R/W): General IO Control bit 0-4 REG06 index 2Bh (R/W): General IO Data REG06 index 2Ch (R/W): PLL Control (3025) bit 0-1 Write 0 to reset the internal counter for the PLL data registers Each write to index 2Dh/2Eh/2Fh will increment this field. REG06 index 2Dh (R/W): Pixel Clock PLL Data (3025) bit 0-? N. Divider (3-28). Stored as 1-26. Could probably be larger ?? 8-14 M. Divident (3-129). Stored as 1-127 16-17 P. Clock multiplier. 0: *8, 1: *3, 2: *2, 3: *1 19 PLL Enable. Enables the PLL clock if set Note: This register consists of 3 bytes at the same index. Writing 00h to index 2Ch resets the internal counter so that the next access to this index accesses the first byte. Each access autoincrements the internal counter. The clock is calculated as: Ref * P * (M+2)/(N+2) REG06 index 2Eh (R/W): MCLK PLL Data (3025) bit 0-? N. Divider (3-28). Stored as 1-26. Could probably be larger ?? 8-14 M. Divident (3-129). Stored as 1-127 16-17 P. Clock multiplier. 0: *8, 1: *3, 2: *2, 3: *1 19 PLL Enable. Enables the PLL clock if set 23 Set when writing new PLL data ? REG06 index 2Fh (R/W): Loop Clock PLL Data (3025) bit 0-? N. Divider (3-28). Stored as 1-26. Could probably be larger ?? 8-14 M. Divident (3-129). Stored as 1-127 16-17 P. Clock multiplier. 0: *8, 1: *3, 2: *2, 3: *1 19 PLL Enable. Enables the PLL clock if set REG06 index 30h W(R/W): Color Key OLVGA REG06 index 32h W(R/W): Color Key Red REG06 index 34h W(R/W): Color Key Green REG06 index 36h W(R/W): Color Key Blue REG06 index 38h (R/W): Color Key Control REG06 index 39h (R/W): MCLK/DCLK Control (3025) REG06 index 3Ah (R/W): Sense Test REG06 index 3Bh (R/W): Test Data REG06 index 3Ch W(R/W): CRC REG06 index 3Eh (R/W): CRC Control REG06 index 3Fh (R): ID bit 0-7 Chip ID. 20h for TVP3020, 25h for TVP3025, 26h for TVP3026 Guess: 10h for TVP3010 REG06 index D5h (R/W): Mode 85 Control (3025) REG0A (R/W): Data Register (3025) UMC UM70c178 Hi-Color DACs: REG06 (R/W): Command Register bit 0-4 (R) Always 0 5-7 Mode: 5: 15bit, 7: 16bit. Note: This register can also be accessed at REG02 by reading REG02 four times. Then the command register can be read or written at REG02. This access will be terminated by any access to REG00, REG01 or REG03 or after write of the command register. (DAC type 4-Nr1w). UMC UM70c188 TrueColor DACs: REG06 (R/W): Command Register bit 0-3 (R) Always 0 4 Set in 24bit mode, clear in all other modes 5-7 Mode: 5: 15bit, 7: 16bit. Don't care for 24bit Note: This register can also be accessed at REG02 by reading REG02 four times. Then the command register can be read or written at REG02. This access will be terminated by any access to REG00, REG01 or REG03 or after a read or write of the command register. (DAC type 4-1r1w). Forcing HiColor DACs into command mode: Note: This works on the Sierra, ATT, Winbond DACs and clones, not on the Brooktree or TI DACs, also the MUSIC DACs will require an extra read of 3C6h. procedure dactocomm; {switches DAC to command register} var x:word; begin x:=inp($3C8); {clear old state} x:=inp($3C6); x:=inp($3C6); x:=inp($3C6); {Read $3C6 4 times.} x:=inp($3C6); end; Now reads and writes to $3C6 will access the command register. Depending on the DAC type you may have multiple read/writes, one write/multiple reads or one read/write of the command register before it switches back to the PEL register. Any access to $3C7-$3C9 will switch back to the PEL mask register. Forcing HiColor DACs into normal mode: procedure dactopel; {switches DAC back to normal mode} var x:word; begin x:=inp($3C8); end; function testdac:string; var x,y,z,v,oldcommreg,oldpelreg:word; type pel=record index,red,green,blue:byte; end; procedure readpelreg(index:word;var p:pel); begin p.index:=index; disable; outp($3C7,index); p.red :=inp($3C9); p.blue :=inp($3C9); p.green:=inp($3C9); enable; end; procedure writepelreg(var p:pel); begin disable; outp($3C8,p.index); outp($3C9,p.red); outp($3C9,p.blue); outp($3C9,p.green); enable; end; function setcomm(cmd:word):word; begin dac2comm; outp($3c6,cmd); dac2comm; setcomm:=inp($3c6); end; procedure waitforretrace; begin repeat until (inp(CRTC+6) and 8)=0; repeat until (inp(CRTC+6) and 8)>0; {Wait until we're in retrace} end; function dacis8bit:boolean; var pel2,x,v:word; pel1:pel; begin pel2:=inp($3C8); readpelreg(255,pel1); v:=pel1.red; pel1.red:=255; writepelreg(pel1); readpelreg(255,pel1); x:=pel1.red; pel1.red:=v; writepelreg(pel1); outp($3C8,pel2); dacis8bit:=(x=255); end; function testdacbit(bit:word):boolean; begin dac2pel; outp($3C6,oldpel and (bit xor $FF)); dac2comm; disable; outp($3C6,oldcomm or bit); v:=inp($3C6); outp($3C6,v and (bit xor $FF)); enable; testdacbit:=(v and bit)<>0; end; begin setDAC(_dac8,'Normal'); dac2comm; oldcomm:=inp($3C6); dactopel; oldpel:=inp($3c6); dac2comm; outp($3c6,0); dac8:=dacis8bit; dac2pel; notcomm:=oldcomm xor 255; outp($3c6,notcomm); dac2comm; v:=inp($3c6); if v<>notcomm then if (setcomm($E0) and $e0)<>$e0 then begin {Bits 5-7 of command register NOT writable.} dac2pel; x:=inp($3C6); repeat y:=x; {wait for the same value twice} x:=inp($3C6); until (x=y); z:=x; dac2comm; if daccomm<>$8E then begin {If command register=$8e, we've got an SS24} y:=8; repeat x:=inp($3C6); dec(y); until (x=$8E) or (y=0); end else x:=daccomm; if x=$8e then setDAC(_dacss24,'SS24') else setDAC(_dac15,'Sierra SC11486'); dac2pel; end else begin if (setcomm($60) and $E0)=0 then begin if (setcomm(2) and 2)>0 then setDAC(_dacatt,'ATT 20c490') else setDAC(_dacatt,'ATT 20c490'); end else begin x:=setcomm(oldcomm); if inp($3c6)=notcomm then begin if setcomm($FF)<>$ff then setDAC(_dacadac1,'Acumos ADAC1') else begin dac8now:=dacis8bit; dac2comm; outp($3C6,(oldcomm or 2) and $FE); dac8now:=dacis8bit; if dac8now then if dacis8bit then setDAC(_dacatt,'ATT 20c491') else setDAC(_dacCL24,'Cirrus 24bit DAC') else setDAC(_dacatt,'ATT 20c492'); end; end else begin if trigdac=notcomm then setDAC(_dacCL24,'Cirrus 24bit DAC') else begin dac2pel; outp($3c6,$FF); case trigdac of $44:setDAC(_dacmus,'MUSIC ??'); $82:setDAC(_dacmus,'MUSIC MU9C4910'); $8e:setDAC(_dacss24,'Diamond SS2410'); else if testdacbit($10) then setDAC(_dacsc24,'Sierra 16m') else if testdacbit(4) then setDAC(_dacUnk9,'Unknown DAC #9') else setDAC(_dac16,'Sierra 32k/64k'); end; end; end; end; end; dac2comm; outp($3c6,oldcomm); end; dac2pel; outp($3c6,oldpel); if (dactype=_dac8) and (DAC_RS2<>0) and (DAC_RS3<>0) then begin oldpel :=inp($3C6); oldcomm:=inp($3C6+DAC_RS2); outp($3C6+DAC_RS2,oldpel xor $FF); if (inp($3C6)=oldpel) and (inp($3C6+DAC_RS2)=(oldpel xor $FF)) then SetDAC(_dacBt484,'Brooktree Bt484'); outp($3C6+DAC_RS2,oldcomm); outp($3C6,oldpel); end; if dactype=_dac8 then begin WaitforRetrace; outp($3C8,222); outp($3C9,$43); outp($3C9,$45); outp($3C9,$47); {Write 'CEGEDSUN' + mode to DAC index 222} outp($3C8,222); outp($3C9,$45); outp($3C9,$44); outp($3C9,$53); outp($3C8,222); outp($3C9,$55); outp($3C9,$4E); outp($3C9,13); {Should be in CEG mode now} outp($3C6,255); x:=(inp($3c6) shr 4) and 7; if x<7 then begin setDAC(_dacCEG,'Edsun CEG rev. '+chr(x+48)); WaitforRetrace; outp($3C8,223); outp($3C9,0); {Back in normal dac mode} end; end; end; This ID's all known DAC types, except: - Sierra "mark2" and "Mark3" are all ID'd as Mark 3. - Avance Logic ALG1101 DAC can not be ID'd. - TI 34075, ATI 68830, 68860 and 68875 can not be ID'd - The Edsun CEG test has not been verified.