我正在尝试设计一个基于 4 位乘法器的 8 位乘法器。所以这是我的代码:
module _8bit_multiply(a, b, q);
input [7:0] a;
input [7:0] b;
output [15:0] q;
wire [7:0] q0;
wire [7:0] q1;
wire [11:0] q2;
wire [11:0] q3;
wire [7:0] x0;
wire [11:0] x1;
wire [7:0] sum0;
wire [12:0] sum1;
wire [12:0] sum2;
wire co0;
wire co1;
wire temp;
_4bit_multiply m1(a[3:0], b[3:0], q0);
assign q[3:0] = q0[3:0];
assign x0[3:0] = q0[7:4];
_4bit_multiply m2(a[7:4], b[3:0], q1);
nbit_adder s1(x0, q1, 0, sum0, co0);
_4bit_multiply m3(a[3:0], b[7:4], q2);
_4bit_multiply m4(a[7:4], b[7:4], x1);
assign q3[11:4] = x1[7:0];
nbit_adder s2(q2, q3, 0, sum1, co1);
nbit_adder s3(sum0, sum1, co0, sum2, temp);
nbit_adder s4(sum2, 0, co1, sum2, temp);
assign q[15:4] = sum2[12:0];
endmodule
然后我得到这个错误:
错误 (12014): 扇出到“q[15]”的网络“sum2[11]”不能分配多个值
错误 (12015):网络由“nbit_adder:s3|s[11]”馈送错误 (12015):
网络由“nbit_adder:s4|s[11]”提供
不仅如此。我应该怎么办 ?