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- Chips&Tech PC Video Video Windowing Controller
-
- 82c9001A
-
- The CT 82c9001 is used for framegrabbers like the Video Blaster.
-
-
-
- index 00h (R/W): I/O Address Register
- bit 1-7 These bits determine the lower 8 bits of the address the card
- responds at. If CS/ is low on RESET this register is initialised to
- 0D6h. If CD/ is high on RESET the register is loaded with the value
- on the databus during the first write to the chip.
-
- index 01h (R/W): Memory Access Register
- bit 4 If set the VRAM Write Mask is enabled.
-
- index 06h (R/W): Linear Memory Base Address Register
- bit 0-3 Starting Address of the linear in 1MB units.
-
- index 07h (R/W): Data Mask Register, Luminance Data
- bit 0-7 A set bit enables the corresponding bits in each byte of the
- Luminance data to be modified during data acquisition.
-
- index 08h (R/W): Data Mask Register, Chrominance Data
- bit 0-7 A set bit enables the corresponding bits in each byte of the
- Chrominance data to be modified during data acquisition.
-
- index 09h (R/W): Interrupt Mask Register
- bit 0 If set Video Even Vsync Interrupt is enabled.
- 1 If set Video Odd Vsync Interrupt is enabled.
- 2 (R) Video Vsync
- 3 (R) Video Field. 0=Even, 1=Odd
- 4 (R) VGA VSync
- 5 (R) VGA HSync
-
- index 10h-13h General Purpose I/O Register 0-3
-
- index 18h (R/W): General Purpose I/O Control Register
- bit 0 I2C Bus Clock. Reads/Writes the I2CK pin
- 1 I2C Bus Data. Reads/Writes the I2CO pin
- 2 I2C bus read back input pin I2CI. This pin should be tied to I2CO.
- 4 If clear enables decode of R10 on GPIO0.
- 5 If clear SCSMAT is output on GPOI1, else enables decode of R11 on
- GPIO1.
- 6 If clear enables decode of R12 on GPIO2.
- 7 If clear enables decode of R13 on GPIO3.
-
- index 20h (R/W): Video Acquisition Mode Register
- bit 0 If set start video acquisition. Type of acquisition determined by
- bits 1-3. If set Stop Acquisition and allow access to video memory.
- After an Acquisition this bit should be tested before accessing
- video memory.
- 1 If clear Continuos Video Acquisition, if set Acquire only a field or
- frame (see bit 2). Bit 0 cleared at the end of acquisition.
- 2 If clear Acquire a video frame (full picture), if set (only for
- interlaced video) acquire only a field.
- 3 If clear Acquire an even (first) field, if set Acquire an odd
- (second) field.
- 4 If set Video Hsync is active high.
- 5 If set Video Vsync is active high.
- 7 If clear video input is interlaced.
-
- index 21h (R/W): Acquisition Window Control Register
- bit 0 If set Video Input Cropping is enabled.
- 1 If set capture outside cropping window, if clear capture inside
- cropping window.
- 2 If set Horizontal Video Input Scaling is enabled.
- 3 If set Vertical Video Input Scaling is enabled.
- 4 Video Input Data Multiplexing. If set the input is non-multiplexed
- (i.e.. RGB), if clear input is multiplexed (i.e.. YUV).
- 5 Multiplexing Ratio. Only active if bit 4 is 0.
- 0: 4:1:1 or 2:1:1, 1: 4:2:2
- 6 If set select XFLD input for field signal, if clear use internally
- generated field signal.
- 7 If set invert field signal polarity.
-
- index 22h-23h W(R/W): Acquisition Window, X-Start Register
- bit 0-9 Horizontal Start of Acquisition Window measured in pixel clocks from
- the trailing edge of Hsync.
-
- index 24h-25h W(R/W): Acquisition Window, Y-start Register
- bit 0-9 Vertical Start of Acquisition Window measured in scanlines from the
- trailing edge of (Vsync + V Start Adjust (index 30h)).
-
- index 26h-27h W(R/W): Acquisition Window, X-end Register
- bit 0-9 Horizontal End of Acquisition Window measured in pixel clocks from
- the trailing edge of Hsync.
-
- index 28h-29h W(R/W): Acquisition Window, Y-end Register
- bit 0-9 Vertical Start of Acquisition Window measured in scanlines from the
- trailing edge of (Vsync + V Start Adjust (index 30h)).
-
- index 2Ah-2Ch 3(R/W): Acquisition Address Register
- bit 0-19 Linear Address of the start of the Acquisition Buffer.
- 1024 bytes are reserved for each line.
-
- index 2Dh (R/W): Acquisition Horizontal Scaling Register.
- bit 0-5 If enabled by index 21h bit 2, this is the number of pixels (1-63)
- written for each 64 input pixels.
-
- index 2Eh (R/W): Acquisition Vertical Scaling Register.
- bit 0-5 If enabled by index 21h bit 3, this is the number of lines (1-63)
- written for each 64 input lines.
-
- index 2Fh (R/W): Scaling Field Adjust Register.
- bit 0-6 Modifies the scaling value for the odd field during acquisition.
- This is a diagnostic register and should normally be set to the same
- value as index 2Eh.
-
- index 30h (R/W): Input Video Start Adjust
- bit 0-5 Number of scanlines from the trailing edge of Vsync to the start of
- the active video frame. Should always be non-zero.
-
- index 38h (R/W): Scaling Control Register.
- bit 0-1 Chroma Multiplex Adjust Bits.
- 2 Y-Over-Write-Mode. When acquiring from an interlaced source with a
- scaling of less than 1/2, this bit and the Field Grab bit (index 20h
- bit 2) should be set to write a scaled image from only one of the
- video fields.
- 3 X-Max Enable. If set prevents wrap around of memory X-address.
- 4 Y-Max Enable. If set prevents wrap around of memory Y-address.
- Should be set for PAL video.
- 7 Fast Write Enable. If set CPURDY is asserted one clock earlier than
- normal.
-
- index 40h (R/W): Display Area Control Register
- bit 0 If clear Overlay Window using an X-Y Window is enabled.
- 1 If clear Overlay Window using Color Keying is enabled.
- 2 If set display the Display Frame Buffer Data in the Non-color key or
- non X-Y Window area, else display VGA data.
- 3 If set display Frame Buffer Data in the X-Y Window area, else
- display VGA data. Only active if bit 0 is set.
- 4 If set display Frame Buffer Data in the Color Key area, else display
- VGA data. Only active if bit 1 is set.
- 5 If set display Frame Buffer Data in the X-Y Window or Color Key
- area, else display VGA data.
- 6-7 Skew between VGA data input and the multiplexer control output in
- VGA clocks: 0: 2 VGA clocks, 1: 3 clocks, 2: 4 clocks, 3: 5 clocks.
-
- index 41h-42h W(R/W): Display Window, X-start Register
- bit 0-9 Horizontal start of the Display Window in pixels from the trailing
- edge of the VGA Hsync.
-
- index 43h-44h W(R/W): Display Window, Y-start Register
- bit 0-9 Vertical start of the Display Window in lines from the trailing edge
- of the VGA Vsync
-
- index 45h-46h W(R/W): Display Window, X-end Register
- bit 0-9 Horizontal end of the Display Window in pixels from the trailing
- edge of the VGA Hsync.
-
- index 47h-48h W(R/W): Display Window, Y-end Register
- bit 0-9 Vertical end of the Display Window in lines from the trailing edge
- of the VGA Vsync
-
- index 49h (R/W): X-Panning, Low Register
- bit 0-7 Lower 8 bits of the Column Offset (*2) loaded into the VRAM during
- the data transfer cycle. For 4:1:1 coding bit 0 should be 0.
-
- index 4Ah (R/W): Y-Panning, Low Register
- bit 0-7 Lower 8 bits of the Row Offset loaded into the VRAM for the first
- active display line.
-
- index 4Bh (R/W): X,Y Panning, High Register
- bit 0 Bit 8 of the X-panning value. The lower 8 bits are in index 49h.
- 4 Bit 8 of the Y-panning value. The lower 8 bits are in index 4Ah.
-
- index 4Ch (R/W): Shift Clock Start Register
- bit 0-6 End of the display blank from the trailing edge of the VGA Hsync.
-
- index 4Dh (R/W): Sync Polarity Register
- bit 0-1 Horizontal Zoom. 0: No Zoom, 1: x2, 2: x4, 3: x8
- 2-3 Vertical Zoom. 0: No Zoom, 1: x2, 2: x4, 3: x8
- 4 VGA Hsync Polarity. If set the VGA Hsync is active high.
- 5 VGA Vsync Polarity. If set the VGA Vsync is active high.
-
- index 4Eh (R/W): Color Compare Register
- bit 0-7 The color to compare with.
-
- index 4Fh (R/W): Color Mask Register
- bit 0-7 Only the bit positions, which are 0 in this register are used in
- color comparisons
-
- index 50h (R/W): Display Window Interlace Control
- bit 0 If set the Display Window is interlaced.
- 1 If set use the VFLD input for the display window field signal,
- rather than the internally generated field signal.
- 2 If set invert the Display Window field signal polarity.
- 3-4 Replication of fields.
- 0,2: No replication.
- 1: Replicate even field.
- 3: Replicate odd field.
-
- index FFh (R/W): Chips Version/Enable Register
- bit 0 (W) PC Video Global Enable. Must be set to enable other registers.
- 1 (W) Enable memory if set.
- 4-7 (R) Silicon revision. 0 for initial release.
-