Verilog 如何编写多维阵列端口测试台
我有一个用Verilog代码编写的7位向上/向下计数器:Verilog 如何编写多维阵列端口测试台,verilog,Verilog,我有一个用Verilog代码编写的7位向上/向下计数器: module updowncount_7bit (clock,reset,hold,up_down,q); input clock,reset,hold,up_down; output reg [6:0] q; integer direction; always @(posedge clock) begin if(up_down) direction = 1; e
module updowncount_7bit (clock,reset,hold,up_down,q);
input clock,reset,hold,up_down;
output reg [6:0] q;
integer direction;
always @(posedge clock)
begin
if(up_down)
direction = 1;
else
direction = -1;
if (!reset)
q <= 0;
else if (!hold)
q <= q + direction;
end
endmodule
您似乎没有从测试台上将
reset
应用到您的模块。因此,q
将始终是X
,这看起来就像您看到的一样
module counter_7bit_tb;
wire [6:0]f_tb;
reg clock_in_tb, reset_tb, hold_tb, up_down_tb;
updowncount_7bit dut(clock_in_tb, reset_tb,hold_tb, up_down_tb, f_tb);
initial begin
clock_in_tb = 0;reset_tb= 1; hold_tb = 0;up_down_tb=1;
#10;
forever begin
#10 clock_in_tb= ~clock_in_tb ;
end
end
endmodule