Stimuli Inputs for Combinational Circuit Testing Throughout the initial a=4'b1011; simulation a initial remains constant begin After 20ns the #20b=4'b1011; simulation is finied.Allow #20b=4'b1110; At 140 ns oe changes effects of the last #20b=4'b1110; to 0 causing the y input change to output become Z #800e=1b0;-- be shown in simulation results. #20 $finish; f changes every 23ns causing end various functions always #23 f =f+1; to be examined Name 0·1·20·130·1·40· ·50· ·60··70·1·80·1·90·t·100 120 ·130 1·150ns 0 ps B b 6 + 0 oe ASIC Design,by Yan Bo 22ASIC Design, by Yan Bo 22 initial a=4'b1011; initial begin #20 b=4'b1011; #20 b=4'b1110; #20 b=4'b1110; #80 oe=1'b0; #20 $finish; end always #23 f = f +1; Stimuli Inputs for Combinational Circuit Testing Throughout the simulation a remains constant f changes every 23ns causing various functions to be examined At 140 ns oe changes to 0 causing the y output become Z After 20ns the simulation is finied. Allow effects of the last input change to be shown in simulation results