home *** CD-ROM | disk | FTP | other *** search
-
- OrCAD
-
- PROGRAMMABLE LOGIC DESIGN TOOLS
-
- SCHEMATIC SYMBOLS
-
-
- To define the internal functioning of a programmable device with schematics
- rather than with equations, the special library named PLDGATES.LIB is
- available, as explained in the user's guide. The following generic gates
- appear in the library.
-
- AND16 through AND2 And (all widths from 16 to 2)
- OR16 through OR2 Or ( " " " " " ")
- NAND16 through NAND2 Nand ( " " " " " ")
- NOR16 through NOR2 Nor ( " " " " " ")
- XOR16 through XOR2 Exclusive-or ( " " " " " ")
- XNOR16 through XNOR2 Exclusive-nor ( " " " " " ")
-
- NOT Inverter (single)
- TRI Tristate gate (single)
- TRINOT Inverting tristate gate (single)
-
- In addition, the PLD compiler will accept the following generic parts modelled
- after the TTL parts of the equivalent numbers.
-
- G00 Quad 2-input nand
- G02 Quad 2-input nor
- G04 Hex inverter
- G08 Quad 2-input and
- G10 Triple 3-input nand
- G11 Triple 3-input and
- G13 Dual 4-input nand, Schmitt triggered
- G14 Hex inverter, Schmitt triggered
- G18 Dual 4-input nand
- G19 Hex inverter
- G20 Dual 4-input nand
- G21 Dual 4-input and
- G26 Quad 2-input nand
- G27 Triple 3-input nor
- G28 Quad 2-input nor
- G30 8-input nand
- G32 Quad 2-input or
- G37 Quad 2-input nand
- G40 Dual 4-input nand
- G42 4:10 decoder
- G43 4:10 excess-3-to-decimal decoder
- G44 4:10 excess-3 Gray to decimal decoder
- G48 BCD to seven-segment decoder
- G51 And-nor array
- G54 4-wide and-nor-array
- G55 2-wide 4-input and-nor-array
- G73 Dual JK flip-flop with clear
- G74 Dual D flip-flop
- G75 4-bit latch
- G76 Dual JK flip-flop with set and clear
- G77 4-bit latch
- G80 Gated full adder
- G82 2-bit full adder
- G85 4-bit comparitor
- G86 Quad 2-input xor
- G96 5-bit shift register
- G107 Dual JK flip-flop with clear
- G109 Dual JK flip-flop with set and clear
- G112 Dual JK flip-flop with set and clear
- G114 Dual JK flip-flop with set, common clear and clock
- G125 Tri-state buffer (Active-low enable)
- G126 Tri-state buffer (Active-high enable)
- G132 Quad 2-input and, Schmitt triggered
- G133 13-wide nand
- G134 12-wide nand
- G138 3:8 decoder
- G139 Dual 2:4 decoder
- G145 4:10 decoder
- G147 10:4 priority encoder
- G148 8:3 priority encoder
- G150 16:1 multiplexer
- G151 8:1 multiplexer
- G152 8:1 multiplexer
- G153 Dual 4:1 multiplexer
- G154 4:16 decoder
- G155 Dual 2:4 decoder
- G157 Quad 2:1 multiplexer
- G158 Quad 2:1 multiplexer
- G160 4-bit decade counter, asynchronous clear
- G161 4-bit binary counter, asynchronous clear
- G162 4-bit decade counter, synchronous clear
- G163 4-bit binary counter, synchronous clear
- G164 8-bit shift register
- G174 Hex D flip-flops
- G175 Quad D flip-flops
- G180 9-bit parity checker
- G183 Dual 1-bit full adder
- G194 4-bit shift register
- G195 4-bit shift register
- G240 Tri-state drivers (inverting)
- G241 Tri-state drivers (true)
- G242 Quad bus transceivers, inverting
- G243 Quad bus transceivers, noninverting
- G244 Tri-state drivers (true)
- G245 Octal bus transceiver, noninverting
- G251 8:1 multiplexor, tristate output
- G253 Dual 4:1 multiplexor, tristate output
- G257 Quad 2:1 multiplexor, noninverting
- G258 Quad 2:1 multiplexor, inverting
- G260 Dual 5-input nor
- G266 Quad 2-input xnor
- G273 Octal flip-flops with clear
- G280 9-bit parity checker
- G298 Quad 2:1 multiplexors
- G352 Dual 4:1 multiplexer
- G365 Hex bus driver
- G366 Hex bus driver, inverting
- G367 Hex bus driver
- G368 Hex bus driver, inverting
- G373 8-bit latch
- G374 Eight-bit register
- G375 4-bit latch
- G445 4:10 decoder
- G446 Quad bus transceiver, inverting
- G449 Quad bus transceiver
- G465 Octal tristate buffer
- G466 Octal tristate buffer, inverting
- G467 Octal tristate buffer
- G468 Octal tristate buffer, inverting
- G521 8-bit identity comparitor
- G540 Octal tristate buffer, inverting
- G541 Octal tristate buffer
- G620 Octal bus transceiver, inverting
- G623 Octal bus transceiver
- G640 Octal bus transceiver
- G643 Octal bus transceiver
- G645 Octal bus transceiver
-
-
- Please note that some standard parts contain more logic than readily fits in
- ordinary programmable logic devices. The parity checkers and binary
- comparitors, for example, rely on internal exclusive-or gates, which expand
- exponentially when converted to sum-of-products form. These devices can be
- used to define programmable logic, but usually not with all pins connected.
- Some of the input pins must be tied to power or ground.
-
- Parts from the ordinary TTL library, such as LS00, do not work in this version.
- It is necessary to use the equivalent G00 part instead.
-
-