ModuleWare Reference Guide - Hornad

Register PartsRS Flip-Flop (rsff)FunctionIf rst and set are synchronous, then at every clk trigger (rising edge if clk_type = Rising, fallingedge if clk_type = Falling):qqb= rst_val= set_val= RS Truth Table= NOT(rst_val)= NOT(set_val)= NOT(RS Truth Table)If rst is activeIf set is activeIf enable is active or not connectedIf rst is activeIf set is activeIf enable is active or not connectedIf rst and clr are asynchronous:qqb= rst_val= set_val= NOT(rst_val)= NOT(set_val)if rst is active (irrespective of the clk trigger)if set is active (irrespective of the clk trigger)if rst is active (irrespective of the clk trigger)if set is active (irrespective of the clk trigger)and at every clk trigger (rising edge if clk_type = Rising or falling edge if clk_type = Falling):q = RS Truth Table if enable is active or not connectedqb = NOT(RS Truth Table) if enable is active or not connectedTruth TablesThe tables are for positive polarities. For negative polarities, invert the values.Asynchronous rst and set:Table 7-20. RS Flip-Flop Truth Table — Asynchronous rst and setenable clk rst set q qb- - 1 - / NC rst_val NOT(rst_val)- - 0 / NC 1 set_val NOT(set_val)NC posedge 0 / NC 0 / NC RS TT NOT(RS TT)1 posedge 0 / NC 0 / NC RS TT NOT(RS TT)0 posedge 0 / NC 0 / NC q qbSynchronous rst and set:Table 7-21. RS Flip-Flop Truth Table — Synchronous rst and setenable clk rst set q qb- - 1 - / NC q qb- - 0 / NC 1 q qbModuleWare Reference Manual, Library Version 1.9 155September 18, 2008