Counter Design with D Flip-Flop

Cemal U. OP (Company: Hacettepe University) #3943135
Rate this post
• ▲ useful
▼ not useful 
I will write a counter code in verilog that counts like this
(with D Flip Flop and some logic gates)

0000 -> 0
0010 -> 2
0100 -> 4
0110 -> 6
1000 -> 8
1010 -> 10
1100 -> 12
1001 -> 9
0110 -> 6
0011 -> 3
0000 -> 0

Can someone help me how I can write it ?  :) thanks
Reply Quote Edit Move Thread sperren Anmeldepflicht aktivieren Anpinnen Delete topic Thread mit anderem zusammenführen Report post
Lothar M. Moderator (Company: Titel) #3944478
Rate this post
• ▲ useful
▼ not useful 
Cemal Unal wrote:
> Can someone help me how I can write it ?  :)
What comes after the ending '0'?

If the counter loops again from the beginning, then implement a counter 
that counts in cycles from 0 to 9 and decode each counter step to your 
desired output value afterwards:
1
reg [3:0] cnt = 4'h0;

2


3
always @ (posedge clock)

4
begin : COUNTER

5
  if (cnt < 9) 

6
    cnt <= cnt + 1;

7
  else

8
    cnt = 4'h0;

9
end

10


11
always @ (cnt) 

12
begin : DECODER

13
  case (cnt)

14
    4'h0: out = 4'b0000;

15
    4'h1: out = 4'b0010;

16
    4'h2: out = 4'b0100;

17
    :

18
    4'h9: out = 4'b0011;

19
  endcase

20
end


And so you don't have to dig around with D-FFs and logic gates. The 
synthesizer/compiler has to deal with it...
Reply Quote Edit Delete Report post
Ale Guest #3944504
Rate this post
• ▲ useful
▼ not useful 
Lothar wrote a behavioral description of what you wanted... but you 
could write it using  primitives (d-flipflops and gates) to achieve the 
same result... as you wanted... You may wan to draw the circuit on a 
piece of paper, or you could use the schematic editor that some fpga 
packages provide
Reply Quote Edit Delete Report post
Watch this topic

Reply

Note: the original post is older than 6 months. Please don't ask any new questions in this thread, but start a new one.

Formatting
  • [c]C-Code[/c]
  • [vhdl]VHDL-Code[/vhdl]
  • [code]code in other languages, ASCII drawings[/code]
  • [math]formula (LaTeX syntax)[/math]
  • [[Title]] – link to an article
  • Link to another post: right-click its post ID (#8078628), copy the address, paste it into the text

More about formatting

Post long source code as an attachment, not in the text.

Your name and e-mail address

Already registered? Log in

Not shown to anyone. We send you a link; your post appears once you confirm it there.

By submitting you create a free account and accept the terms of use.