ModuleWare Reference Guide - Hornad

Primitive PartsCMOS Primitive (pcmos)CMOS Primitive (pcmos)This is a highly parameterized cmos primitive which has a scalar input, ascalar output and two control inputs.The rise, fall and turnoff delays can be specified by separate enumeratedparameters rise_delay, fall_delay and turnoff_delay respectively.If there is no delay specification, there is no propagation delay throughthe gate.If turnoff_delay is not specified, the smallest of the rise and fall delaysapplies on output transitions to X and Z. If turnoff_delay is specified, it determines the delay oftransitions to Z, and the smallest of the three delays determines the delay of transitions to X.Some combinations of data input values and control input values cause these gates to output oneof the two values without a preference for either value. The logic table for this gate includes twovalues representing such unknown results. The value L is a result representative of a value of 0or Z. The value H is a result representative of a value of 1 or Z.Functiondout = din generated according to the following truth tablesTruth TableTable 10-11. CMOS Primitive Truth Tablepcmos Control (pena)0 1 X ZD 0 0 Z L LA 1 1 Z H HT X X Z X XA Z Z Z Z ZTable 10-12. CMOS Primitive Truth Tablepcmos Control (nena)0 1 X ZD 0 Z 0 L LA 1 Z 1 H HT X Z X X XA Z Z Z Z Z240ModuleWare Reference Manual, Library Version 1.9September 18, 2008