[HDLBits] Exams/ece241 2014 q7a

Design a 1-12 counter with the following inputs and outputs:

• Reset Synchronous active-high reset that forces the counter to 1
• Enable Set high for the counter to run
• Clk Positive edge-triggered clock input
• Q[3:0] The output of the counter
• c_enable, c_load, c_d[3:0] Control signals going to the provided 4-bit counter, so correct operation can be verified.

You have the following components available:

• the 4-bit binary counter (count4) below, which has Enable and synchronous parallel-load inputs (load has higher priority than enable). The count4 module is provided to you. Instantiate it in your circuit.
• logic gates

module count4(
	input clk,
	input enable,
	input load,
	input [3:0] d,
	output reg [3:0] Q
);

The c_enable, c_load, and c_d outputs are the signals that go to the internal counter's enable, load, and d inputs, respectively. Their purpose is to allow these signals to be checked for correctness.

module top_module (
    input clk,
    input reset,
    input enable,
    output [3:0] Q,
    output c_enable,
    output c_load,
    output [3:0] c_d
); //
    assign c_enable=enable;
    /*
    always@(posedge clk) begin
        if(reset||Q>=12) begin
            c_load<=0;
            c_d<=1;
        end
        else
            c_load<=1;
    end
    */
    assign c_load=(reset||(Q>=12&&enable)) ? 1:0;
    assign c_d=c_load;
    count4 the_counter (clk, c_enable, c_load, c_d,Q);
 
endmodule