(编辑)我正在verilog算术项目和我卡在符号扩展部分(假设这是问题)。我有4位输入A,B,应该有8位输出。对于一些进程(总和,子...)我需要使用符号扩展来使8位输出。所以对于算术的主体,我有这个代码。这是代码的一半。我不包括半部分cuz它只是长..verilog算术(符号扩展)编辑
module arithmetic(A, B, AN0, DP, sum, sub, mult, div, comp, shiftLeft,
shiftRight, signExtend);
input signed [3:0] A, B;
output [7:0] sum, sub, mult, div, comp, shiftLeft, shiftRight,
signExtend;
output AN0, DP;
//sum
reg [4:0] qsum;
[email protected] (A, B)
qsum = A+B;
assign sum = {{3{qsum[4]}},qsum};
//sub
reg [4:0] qsub;
[email protected] (A, B)
qsub = A-B;
assign sub = {{3{qsub[4]}},qsub};
//mult
reg [7:0] qmult;
[email protected] (A, B)
qmult = A * B;
assign mult = qmult;
,当我检查我的模拟,它没有任何价值,但Z,并且多个X。它甚至不显示任何输入值。为什么会这样?谢谢
(编辑)这是我的测试平台代码。有8个操作(总和,减,乘,除法,比较器,shiftleft,shiftright,符号扩展)
module lap3_top_tb();
reg signed [3:0] A, B;
reg [2:0] Operation;
wire [7:0] Result;
wire DP, AN0;
lab3_top ulap3_top(
.A(A),
.B(B),
.Operation(Operation),
.Result(Result),
.DP(DP),
.AN0(AN0)
);
initial begin
A = 6; B = 7; Operation = 0;
#20;
A = -6; B = -7; Operation = 0;
#20;
A = 6; B = 7; Operation = 1;
#20;
A = -6; B = -7; Operation = 1;
#20;
A = 6; B = 7; Operation = 2;
#20;
A = -6; B = 7; Operation = 2;
#20;
A = 7; B = 4; Operation = 3;
#20;
A = 7; B = 0; Operation = 3;
#20;
A = 6; B = 7; Operation = 4;
#20;
A = -6; B = -7; Operation = 4;
#20;
A = 1; B = 6; Operation = 5;
#20;
A = 1; B = -6; Operation = 5;
#20;
A = 1; B = 6; Operation = 6;
#20;
A = 1; B = -6; Operation = 6;
#20;
A = 6; B = 0; Operation = 7;
#20;
A = -5; B = 0; Operation = 7;
#20;
end
endmodule
的lap3_top文件在这里。 (mux_8_1会选择直通结果输出和缩小。如果你需要的代码,让我知道!但我想MUX正常工作)
module lap3_top(A, B, Operation, Result, AN0, DP);
input signed [3:0] A, B;
input [2:0] Operation;
output AN0, DP;
output [7:0] Result;
wire a, b, c, d, e, f, g, h;
arithmetic uarithmetic(
.A(A),
.B(B),
.AN0(AN0),
.DP(DP),
.sum(a),
.sub(b),
.mult(c),
.div(d),
.comp(e),
.shiftLeft(f),
.shiftRight(g),
.signExtend(h)
);
mux_8_1 umux8_1(
.A(a),
.B(b),
.C(c),
.D(d),
.E(e),
.F(f),
.G(g),
.H(h),
.Operation(Operation),
.Result(Result)
);
endmodule
非常感谢你的家伙!
你好杰克,你能分享一些你的测试台代码吗? –
你还可以发布你的'lab3_top'模块,看看'testbench'到'sum'模块的所有连接吗? – Roman