如何在systemverilog中获取值数组作为plusargs？ [英] how to get array of values as plusargs in systemverilog?

问题描述

如何在systemverilog中获取值数组作为参数，我的要求是我需要从命令行获取未定义大小的命令数组，以及如何将这些参数获取到数组/队列中

How to get the array of values as arguments in systemverilog, my requirement is I need get an array of commands of undefined size from the command line ,and how to get these arguments to an array/Queue

例如：

+ CMDS = READ，WRITE，READ_N_WRITE ：应该

推荐答案

$ value $ plusargs 支持数组，它确实支持字符串。参见 IEEE Std 1800-2012 § 21.6命令行输入。在SystemVerilog中解析字符串只是有点麻烦，但仍然非常可行，尤其是当分隔符表示为单个字符时。这是一个使用SystemVerilog队列的通用字符串解析器，用于重新编码在substr standard / 1800-2012.html rel = nofollow noreferrer> IEEE Std 1800-2012 § 7.10队列和§ 6.16.8 Substr

$value$plusargs does not support arrays, it does support strings. See IEEE Std 1800-2012 § 21.6 "Command line input". Parsing a string in SystemVerilog is only a little cumbersome but still very doable, especially when the separator is represented as a single character. Here is a generic string parser using a SystemVerilog queue for recoding the indexes and string method substr defined in IEEE Std 1800-2012 § 7.10 "Queue" and § 6.16.8 "Substr"

function void parse(output string out [], input byte separator, input string in);
    int index [$]; // queue
    foreach(in[i]) begin // find commas
        if (in[i]==separator) begin
            index.push_back(i-1); // index before comma
            index.push_back(i+1); // index after comma
        end
    end
    index.push_front(0); // first index
    index.push_back(in.len()-1); // last index
    out = new[index.size()/2];
    foreach (out[i]) begin
        out[i] = in.substr(index[2*i],index[2*i+1]);
        /*$display("cmd[%0d] == in.substr(%0d,%0d) == \"%s\"",
                         i, index[2*i],index[2*i+1], out[i]);  */
    end
endfunction : parse

然后将其与<$ c组合$ c> $ value $ plusargs 来解析输入：

Then combine it with $value$plusargs to parse the input:

string cmd[];
string plusarg_string;
if ( $value$plusargs("CMDS=%s",plusarg_string) ) begin
    parse(cmd, ",", plusarg_string);
end
foreach(cmd[i])
    $display("CMD[%0d]:'%s'",i,cmd[i]);

完整的示例： http://www.edaplayground.com/s/6/570

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