modelsim中的Verilog错误-接近“=&引用;:语法错误,意外'=';,应为标识符或类型\标识符或NETTYPE\标识符
我在modelsim 10.4中遇到以下错误: 错误:(vlog-13069)D:/divya/verilog/pipelined alu/alu.v(5):靠近“=”:语法错误,意外的“=”,需要标识符或类型标识符或NETTYPE标识符 守则:modelsim中的Verilog错误-接近“=&引用;:语法错误,意外'=';,应为标识符或类型\标识符或NETTYPE\标识符,verilog,simulation,hdl,modelsim,Verilog,Simulation,Hdl,Modelsim,我在modelsim 10.4中遇到以下错误: 错误:(vlog-13069)D:/divya/verilog/pipelined alu/alu.v(5):靠近“=”:语法错误,意外的“=”,需要标识符或类型标识符或NETTYPE标识符 守则: module func(output reg[15:0] out,input[15:0] a,b,input[3:0] select); case(select) 0:out=a+b; 1:out=a-b; 2:out=a*b; 3:out
module func(output reg[15:0] out,input[15:0] a,b,input[3:0] select);
case(select)
0:out=a+b;
1:out=a-b;
2:out=a*b;
3:out=a;
4:out=b;
5:out=a&b;
6:out=a|b;
7:out=a^b;
8:out=~a;
9:out=~b;
10:out=a>>1;
11:out=a<<1;
default:out=16'hxxxx;
endcase
endmodule
模块功能(输出寄存器[15:0]输出,输入[15:0]a、b,输入[3:0]选择);
案例(精选)
0:out=a+b;
1:out=a-b;
2:out=a*b;
3:out=a;
4:out=b;
5:out=a&b;
6:out=a | b;
7:out=a^b;
8:out=~a;
9:out=~b;
10:out=a>>1;
11:out=a在实现上述组合逻辑时,需要确保将功能描述放在程序块中,就像始终@(*)
或赋值
语句一样(使用哪一个取决于逻辑长度和其他次要因素)。下面是一些格式的代码(请记住,编码风格不仅仅是为了美观;它还有助于发现错误并使阅读代码更容易!):
模块功能(输出寄存器[15:0]输出,
输入[15:0]a,b,
输入[3:0]选择);//我喜欢将io分成多行,以便于阅读
始终@(*)开始//需要将逻辑放入程序块中!
案例(精选)
0:out=a+b;
1:out=a-b;
2:out=a*b;//注意,与这里的所有其他操作相比,这需要相当多的逻辑,组合乘法需要很多门
3:out=a;
4:out=b;
5:out=a&b;
6:out=a | b;
7:out=a^b;
8:out=~a;
9:out=~b;
10:out=a>>1;
11:out=a
module func(output reg [15:0] out,
input [15:0] a, b,
input [3:0] select); // I like to break up io on multiple lines to make it easier to read
always @(*) begin // Need to put logic in a procedural block!
case(select)
0: out = a + b;
1: out = a - b;
2: out = a * b; // Note that this would take quite a bit of logic compared to all the other operations here, combinational multiply take alot of gates
3: out = a;
4: out = b;
5: out = a & b;
6: out = a | b;
7: out = a ^ b;
8: out = ~a;
9: out = ~b;
10: out = a >> 1;
11: out = a << 1;
default: out = 16'hxxxx;
endcase
end
endmodule