m6_2.do

台湾全华科技VHDL教材实例

vsim -t ps work.V6_2 

add wave a	 
add wave b	 
add wave Clk1
add wave Clk2
add wave o        

force clk1 0 0, 1 25000 -r 50000
force clk2 1 0, 0 25000 -r 50000
force a 1
force b 0
run 60000

force a 0
force b 1
run 50000