How to read multidimensional array in Verilog using $readmemh?

Question

I have a multi-dimensional array:

logic [7:0] memory[1:0][1:0];

and a comma-separated file.txt:

1,2
3,4

I am not able to load this file with $readmemh:

initial
begin
   $readmemh("file.txt", memory);
end

Could you suggest a solution?

As the answer below already deals with what will work, Ill just mention this in a comment; the problem specifically is the commas, readmem files can only contain white space, comments, addresses and/or numbers (either binary for readmemb or hex for readmemh). So, to separate values, just use spaces and/or new lines. See section 21.4 of the 2012 LRM. — Unn
– Unn, Commented Oct 10, 2019 at 22:36

user3303020 · Accepted Answer · 2019-10-10 00:04:24Z

1

logic [7:0] mem [1:0][1:0]

For the above 4 elements array each of 8 bits. Define the mem.dat file as follows

01 02
03 04

Then read the file in one shot using readmemh

initial
begin
   $readmemh("mem.dat", mem);
end

answered Oct 10, 2019 at 0:04

user3303020

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1 Comment

Your example would be even more helpful if both unpacked array ranges were not the same, [3:0][1:0] for example.