Flameman/flex10k-board

From eLinux.org
< Flameman
Revision as of 16:12, 15 May 2012 by Legacy (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

ALtera link


example

Asynchronous counter using Verilog


module counter( clk, count );
input clk;
output[3:0] count;

reg[3:0] count;
wire clk;

initial
    count = 4'b0;

always @( negedge clk )
    count[0] <= ~count[0];

always @( negedge count[0] )
    count[1] <= ~count[1];

always @( negedge count[1] )
    count[2] <= ~count[2];

always @( negedge count[2] )
    count[3] <= ~count[3];

endmodule