题目：
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

解题：

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;assign c_load=reset || ((Q==12)&enable);assign c_d=1;count4 the_counter (.clk(clk), .enable(c_enable),.load(c_load),.d(c_d),.Q(Q));endmodule

结果正确

本题为1-12计数器，考察函数例化结合计数器的编程。