ModuleWare Reference Guide - Hornad

Register PartsD Latch (dlatch)If load is set to asynchronous, then at every load trigger:qqb= rst_val= set_val= d= NOT(rst_val)= NOT(set_val)= NOT(d)If rst is active and gate trigger is presentIf set is active and gate trigger is presentIf gate trigger is presentIf rst is active and gate trigIf set is active and gate trigger is presentIf gate trigger is presentIf rst and set are asynchronous and load is set to synchronous:qqb= rst_val= set_val= NOT(rst_val)= NOT(set_val)if rst is active (irrespective of the gate trigger)if set is active (irrespective of the gate trigger)if rst is active (irrespective of the gate triggerif set is active (irrespective of the gate trigger)and at every gate trigger (high level if gate_type = ActiveHigh or low level if gate_type =ActiveLow):q = d if load is active or not connectedqb = NOT(d) ifload is active or not connectedIf load is set to asynchronous:qqb= rst_val= set_val= NOT(rst_val)= NOT(set_val)if rst is active (irrespective of the gate & load trigger)if set is active (irrespective of the gate & load trigger)if rst is active (irrespective of the gate & load trigger)if set is active (irrespective of the gate & load trigger)and at every load trigger:q = d if gate trigger is presentqb = NOT(d) ifgate trigger is presentTruth TablesThe tables are for positive polarities. For negative polarities, invert the values.Asynchronous rst and set and synchronous load:Table 7-4. D Latch Truth Table — Asynchronous rst and set, Synchronousloadload gate rst set q qb- - 1 - / NC rst_val NOT(rst_val)- - 0 / NC 1 set_val NOT(set_val)NC 1 0 / NC 0 / NC d NOT(d)144ModuleWare Reference Manual, Library Version 1.9September 18, 2008