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Kun_Digital_Design's avatar
Kun_Digital_Design
Icon for New Contributor rankNew Contributor
3 years ago

Failure for initialization ROM memory by using $readmemh task

Hi, I initialized my ROM memory (instr_mem) by using the $readmemh task. The ROM was successfully complied and simulated, but the waveform show 32'hxxxxxxxx in instr_mem. It seems the 'instr_mem' ...
ak6dn's avatar
ak6dn
Icon for Regular Contributor rankRegular Contributor
3 years ago

You need to provide a lot more context.

What version of Quartus?

What simulator and version?

Show the contents (at least some lines, not all) of your memory init file.

In your waveform display, can you add other signals like addr1[5:0]?

BTW you can collapse the data bit display, no need to show individual bits.

  • Kun_Digital_Design's avatar
    Kun_Digital_Design
    Icon for New Contributor rankNew Contributor
    3 years ago

    Quartus Prime # Version 20.1.1

    mem_Instruction.txt

    2402000a
24080005
2509012c
240a01f4
254b0022
256b002d
0000000c
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000

    The screenshot of waveform of addr1[5:0] signal