black nike shoes roshe cheapnicesports.com

Negative Edge Flip-Flop

 

Negative-edge Flip-Flop

flip_flop_neg_edge

three_star

VHDL CODE

1) flop_process : PROCESS(clk_sig, reset_sig)
2) BEGIN
3)      If(reset_sig = '0') THEN
4)         ff_out_q_sig <= '0';
5)      ELSIF(clk_sig 'event AND clk_sig = '0') THEN  
6)         ff_out_q_sig <= data_bit_sig;
7)      END If;
8) END PROCESS;     

                      

Here every thing is same except a minor change at line no 5. Since we wanted to code -ve Edge flip flop, where the output "ff_out_q_sig" gets updated with "data_bit_sig" at the falling edge (1 -> 0) of the clock. we have modified the condition at line no 5 to AND clk_sig = '0' thats it!
Now the new condition is, when the clk_sig ticks and clk_sig = '0' (i.e -ve edge).

Dark Grey Vans Authentic, Vans Authentic Dark Purple, Vans Authentic - Boys' Preschool Glow Skulls/white | Glow In The Dark http://carlosmantero.com33-dark-grey-vans-authentic-vans-authentic-dark-purple-vans-authentic-boys-preschool-glow-skulls-white-glow-in-the-dark.html