实现一个电路，当 8 个滑动开关中的奇数个设置为“1”时，该电路会点亮 LED。
这是我正在尝试的项目。在不使用库的情况下，我想到的只有一种解决方案（我还不知道库）。它将 LED 分配给所有开关组合。
知道如何使用/不使用 IEEE 库来优化代码吗？
`timescale 1ns / 1ps
module challenge1(
input [7:0] sw,
output [1:0] led
);
assign led[0] = ( ~sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & sw[4] & ~sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & sw[4] & ~sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & sw[4] & ~sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & sw[4] & sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & sw[4] & sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & sw[4] & sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & ~sw[5] & sw[4] & sw[3] & sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & ~sw[4] & ~sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & ~sw[4] & ~sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & ~sw[4] & sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & ~sw[4] & sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & ~sw[4] & sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & ~sw[4] & sw[3] & sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & sw[4] & ~sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & sw[4] & ~sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & sw[4] & ~sw[3] & sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & sw[4] & sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & sw[4] & sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & sw[4] & sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & ~sw[6] & sw[5] & sw[4] & sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & ~sw[4] & sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & ~sw[4] & sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & ~sw[4] & sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & ~sw[4] & sw[3] & sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & sw[4] & ~sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & sw[4] & ~sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & sw[4] & ~sw[3] & sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & sw[4] & sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & sw[4] & sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & sw[4] & sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & ~sw[5] & sw[4] & sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & ~sw[4] & ~sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & ~sw[4] & ~sw[3] & sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & ~sw[4] & sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & ~sw[4] & sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & ~sw[4] & sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & ~sw[4] & sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & sw[4] & ~sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & sw[4] & ~sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & sw[4] & ~sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & sw[4] & sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & sw[4] & sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & sw[4] & sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( ~sw[7] & sw[6] & sw[5] & sw[4] & sw[3] & sw[2] & sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & ~sw[4] & sw[3] & sw[2] & sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & sw[4] & ~sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & sw[4] & ~sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & sw[4] & ~sw[3] & sw[2] & sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & sw[4] & sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & sw[4] & sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & sw[4] & sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & ~sw[5] & sw[4] & sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & ~sw[4] & ~sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & ~sw[4] & ~sw[3] & sw[2] & sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & ~sw[4] & sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & ~sw[4] & sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & ~sw[4] & sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & ~sw[4] & sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & sw[4] & ~sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & sw[4] & ~sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & sw[4] & ~sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & sw[4] & sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & sw[4] & sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & sw[4] & sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & ~sw[6] & sw[5] & sw[4] & sw[3] & sw[2] & sw[1] & sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & ~sw[4] & ~sw[3] & sw[2] & sw[1] & sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & ~sw[4] & sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & ~sw[4] & sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & ~sw[4] & sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & ~sw[4] & sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & sw[4] & ~sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & sw[4] & ~sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & sw[4] & ~sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & sw[4] & sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & sw[4] & sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & sw[4] & sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & ~sw[5] & sw[4] & sw[3] & sw[2] & sw[1] & sw[0] ) |
( sw[7] & sw[6] & sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & sw[5] & ~sw[4] & ~sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( sw[7] & sw[6] & sw[5] & ~sw[4] & ~sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & sw[6] & sw[5] & ~sw[4] & ~sw[3] & sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & sw[5] & ~sw[4] & sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & sw[6] & sw[5] & ~sw[4] & sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & sw[5] & ~sw[4] & sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & sw[5] & ~sw[4] & sw[3] & sw[2] & sw[1] & sw[0] ) |
( sw[7] & sw[6] & sw[5] & sw[4] & ~sw[3] & ~sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & sw[6] & sw[5] & sw[4] & ~sw[3] & ~sw[2] & sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & sw[5] & sw[4] & ~sw[3] & sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & sw[5] & sw[4] & ~sw[3] & sw[2] & sw[1] & sw[0] ) |
( sw[7] & sw[6] & sw[5] & sw[4] & sw[3] & ~sw[2] & ~sw[1] & ~sw[0] ) |
( sw[7] & sw[6] & sw[5] & sw[4] & sw[3] & ~sw[2] & sw[1] & sw[0] ) |
( sw[7] & sw[6] & sw[5] & sw[4] & sw[3] & sw[2] & ~sw[1] & sw[0] ) |
( sw[7] & sw[6] & sw[5] & sw[4] & sw[3] & sw[2] & sw[1] & ~sw[0] ) ;
endmodule
这里给出两种方法，方法一是mkrieger1在评论中提供的。
module challenge1(
input [7:0] sw,
output [1:0] led
);
reg [3:0] ones_count = 0;
wire led_0;
// Method 1, xor reduction
assign led_0 = ^sw;
// method 2, loop over the vector, count the ones
always @(*) begin
ones_count = 0;
for(integer i = 0; i < 7 ; i++)
if(sw[i] == 1'b1)
ones_count = ones_count + 1;
else
ones_count = ones_count;
end
//
assign led[0] = ones_count[0];
assign led[1] = 1'b0;
endmodule
测试台
module challenge1_tb();
reg [7:0] sw;
reg [1:0] led;
initial begin
$monitor("sw = %b, dut.ones_count = %0d, led[0] = %b, dut.led_0 =%b",sw,dut.ones_count,led[0],dut.led_0);
for(int i = 0; i < 8 ; i++) begin
sw = i;
#1;
end
end
challenge1 dut(
.sw(sw),
.led(led)
);
initial begin
$dumpfile("dump.vcd");
$dumpvars;
end
endmodule
产品
sw = 00000000, dut.ones_count = 0, led[0] = 0, dut.led_0 =0
sw = 00000001, dut.ones_count = 1, led[0] = 1, dut.led_0 =1
sw = 00000010, dut.ones_count = 1, led[0] = 1, dut.led_0 =1
sw = 00000011, dut.ones_count = 2, led[0] = 0, dut.led_0 =0
sw = 00000100, dut.ones_count = 1, led[0] = 1, dut.led_0 =1
sw = 00000101, dut.ones_count = 2, led[0] = 0, dut.led_0 =0
sw = 00000110, dut.ones_count = 2, led[0] = 0, dut.led_0 =0
sw = 00000111, dut.ones_count = 3, led[0] = 1, dut.led_0 =1