[英]Passing a module name as parameter
I want to create this generic wrapper for a bunch of modules I am writing. 我想为我正在编写的一堆模块创建这个通用包装器。 The wrapper should provide the ability to connect these modules to different type of NoCs without having to change the behavior of the inner modules.
包装器应该能够将这些模块连接到不同类型的NoC,而无需改变内部模块的行为。
I thought that one way to do this would be the following. 我认为这样做的一种方法如下。 Considering a very simple module to wrap:
考虑一个非常简单的包装模块:
module add #(
parameter COLUMN_WIDTH = 32
)
(
//data in
input logic [COLUMN_WIDTH-1:0] col_1,
input logic [COLUMN_WIDTH-1:0] col_2,
//data out
output logic [COLUMN_WIDTH-1:0] col_o
);
assign col_o = col_1 + col_2;
endmodule
The wrapper should be the following: 包装器应该如下:
module wrapper #(
parameter COLUMN_WIDTH = 32,
parameter WRAPPED_MODULE = add
)
(
//data in
input logic [COLUMN_WIDTH-1:0] col_1,
input logic [COLUMN_WIDTH-1:0] col_2,
//data out
output logic [COLUMN_WIDTH-1:0] col_o,
/* std signals */
input logic clk,
input logic reset_i // reset everything
);
logic [COLUMN_WIDTH-1:0] max_result;
WRAPPED_MODULE #(.COLUMN_WDITH(COLUMN_WIDTH),
) a(
.*
);
always @(posedge clk) begin
if (reset_i)
max_result <= 0;
else
max_result <= (col_o > max_result) ? col_o : max_result;
end
endmodule
The error I get is the following: 我得到的错误如下:
Error-[IND] Identifier not declared
wrapper.sv, 4
Identifier 'add' has not been declared yet. If this error is not expected,
please check if you have set `default_nettype to none.
Which makes sense since a parameter is not the same as a macro. 这是有道理的,因为参数与宏不同。 A complete design should possibly instantiate a bunch of wrapped modules and I don't want to duplicate code by creating a wrapper for each inner module.
一个完整的设计应该可以实例化一堆包装的模块,我不想通过为每个内部模块创建一个包装来复制代码。 How can I do that?
我怎样才能做到这一点?
A parameter cannot be a module name. 参数不能是模块名称。 It can be a data_type, implicit data_type, or
type
它可以是data_type,隐式data_type或
type
IEEE Std 1800-2012 § A.2.1.1 Module parameter declarations : IEEE Std1800-2012§A.2.1.1 模块参数声明 :
parameter_declaration ::=parameter_declaration :: =
parameter data_type_or_implicit list_of_param_assignments参数data_type_or_implicit list_of_param_assignments
|| parameter type list_of_type_assignments
参数类型list_of_type_assignments
A workaround is to use a generate block and compare the value of the parameter. 解决方法是使用生成块并比较参数的值。
module wrapper #(
parameter COLUMN_WIDTH = 32,
parameter string WRAPPED_MODULE = "add"
)
(
// ...
);
// ...
generate
if (WRAPPED_MODULE=="add") begin
add #(.COLUMN_WDITH(COLUMN_WIDTH) ) a( .* );
end
else begin
// ...
end
endgenerate
// ...
endmodule
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.