Counter Example

• Simple components with a register and extra computation

  • Customized interface and behavior, e.g.
    • counters
    • shift registers

// 8-bit counter with clear and count enable controls

module count8 (CLK, clr, cntEn, Dout);

input CLK;

input clr; // clear counter

input cntEn; // enable count

output [7:0] Dout; // counter value

reg [7:0] Dout;

always @(posedge CLK)

if (clr) Dout <= 0;

else if (cntEn) Dout <= Dout + 1;

endmodule

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