这是我64位乘法器的完整代码。它在我胆大妄为(3星(的Full_multiplier Line第17行中给出了错误。该错误是VSIM-3053非法输出或端口'Out2'的INOUT端口连接。
module full_multiplier(input [63:0] a, b, input [1:0] select, input clk, output reg [63:0] out);
wire [10:0] exp;
wire state;
wire out1;
wire [51:0] man;
wire sign;
check_zero ch1( a, b, 2'b10, clk,state);
check_sign c1(sign,a,b,clk,state);
addexp a1(exp, a, b,clk,state);
mul1 m1( man, a, b, clk,state);
**normalize n1(out, sign, exp, man, clk);**
endmodule
module check_zero (input [63:0] a, b, input [1:0] select, input clk, output reg state);
parameter done = 1'b0, next= 1'b1;
always @(posedge clk) begin
if ((a[51:0] == 0) && (b[51:0] == 0)) begin
//out <= 64'b0;
state <= done;
end else if (a[51:0]==0 && select==0) begin
// out <= b;
state <= done;
end else if (b[51:0]==0 && select==0) begin
// out <= a;
state <= done;
end else if (a[51:0]==0 && select==1) begin
// out[63] <= ~b[63];
// out[62:0] <= ~b[62:0];
state <= done;
end else if (b[51:0]==0 && select==1) begin
// out <= a;
state <= done;
end else if (a[51:0]==0 && select==2) begin
// out <= 0;
state <= done;
end else if (b[51:0]==0 && select==2) begin
// out <= 0;
state <= done;
end else if (a[51:0]==0 && select==3) begin
// out <= 0;
state <= done;
end else if (b[51:0]==0 && select==3) begin
// out[63] <= 1;
// out[62:52] <= 2047;
// out[51] <= 1;
// out[50:0] <= 0;
state <= done;
end else begin
state<=next;
end
end
endmodule
module check_sign(output reg sign,
input [63:0] x,
input [63:0] y,
input clk,
input state);
always@ (posedge clk) begin
if (state==1) begin
sign <= y[63] ^ x[63];
end else begin
sign =0;
end
end
endmodule
module addexp(output reg [10:0] exp,
input [63:0] x,
input [63:0] y,
input clk,
input state);
always@ (posedge clk) begin
if (state==1) begin
exp <= x[62:52] + y[62:52]- 1023;
end else begin
exp <=1023;
end
end
endmodule
module mul1(
output reg [51:0] c,
// output reg [7:0] addexp,
input [63:0] x,
input [63:0] y,
input clk,
input state);
reg [103:0] p;
reg [103:0]a;
integer i;
always @(posedge clk) begin
if (state==1) begin
a=x;
p=0; // needs to zeroed
for(i=0;i<51;i=i+1) begin
if(y[i]) begin
p=p+a; // must be a blocking assignment
end
a=a<<1;
end
for(i=103;i>=0;i=i-1) begin
if (p[i]) begin
c=p[i+:52];
// addexp=i-51;
p=0;
end
end
end else begin
c=0;
end
end
endmodule
module normalize(output reg [63:0] out2,
input sign,
input [10:0] exp,
input [51:0] man,
input clk);
always@ (posedge clk) begin
out2 <= {sign,exp,man};
end
endmodule
module tb_mul1;
reg [63:0] a;
reg [63:0] b;
reg clk;
wire [63:0] out;
full_multiplier m1 ( a, b,2'b10, clk, out);
initial #200 $finish;
initial begin clk=0; forever #5 clk=~clk; end
initial begin
a = 64'h000_0_0000_0000_0000;
b = 64'h000_0_0000_0000_0000;
#20;
#20;
b = 64'h080_8_0000_0000_0001;
a = 64'h080_F_FFFF_FFFF_FFFF;
#60 b = 64'h080_8_0000_0000_0003;
#60 b = 64'h081_8_0000_0000_0000;
#60 a = 64'h080_8_0000_0040_0000;
#60 b = 64'h090_8_0000_0000_0001;
#60 a = 64'h880_8_0000_0040_0000;
#60 a = 64'h890_8_0000_0040_0000;
#60 a = 64'h890_8_0000_0000_0001;
#60 b = 64'h890_8_0000_0000_0001;
#60 b = 64'h890_1_0000_0000_0000;
#60 $stop;
end
endmodule
在您的顶级模块中，您将信号声明为reg：
module full_multiplier(input [63:0] a, b, input [1:0] select, input clk, output reg [63:0] out);
这似乎是因为您曾经在该模块中分配给该信号。现在，您正在从标准化的输出端口获取该信号的值。这意味着现在应该简单地使用电线，而不是使用REG。如果将模块更改为(删除REG(：
module full_multiplier(input [63:0] a, b, input [1:0] select, input clk, output [63:0] out);
然后应该编译。