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Altera_Forum's avatar
Altera_Forum
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14 years ago

write master intermittent issues

I have an SOPC system and a write master. I use the write master to write in a 128 bit word into onchip memory every 1 second (the same address). Some of the time, it works fine but when I make a very small change (i.e., so the 128 bit word changes) the jtag uart output from nios stops outputting, so I just get a blank console screen where it should be periodically outputting the memory contents. It's strange because for some 128 bit words it works fine and for others, it doesn't and i'm having troublee identifiying the problem.

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    --- Quote Start ---

    i'm having troublee identifiying the problem.

    --- Quote End ---

    1) Use SignalTap to probe the Avalon bus when you have the problem.

    2) Simulate the system using Modelsim and recreate the stimulus that is causing the hardware problem.

    3) Debug, and repeat from (1).

    Cheers,

    Dave
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    Ok, will try that. My code is

    while(1)

    {

    printf("Data in MEM1\n");

    for(j = 0; j < 4; j++){

    printf("%X\n",IORD(ONCHIP_MEMORY2_0_BASE, j));

    alt_busy_sleep(1000000);

    }

    }