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Altera_Forum's avatar
Altera_Forum
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17 years ago

Fast clock speed remote_update

I'm not fully au-fait with the correct terminology so forgive me if I use the wrong worms :)

I need to use the remote_update megafunction.

The cyclone 3 devices on the boards I'm working on run at clock speeds of 75MHz and 100Mhz.

According to our hardware guy, the remote_update function will only work at a max of 40MHz.

Is this correct? If so, can anyone give a suggestion of a work around at higher clock speeds?

One suggestion was to create another NIOS2 core that runs at 40Mhz, but that sounds a bit like overkill just for this one function.

1 Reply

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

    The hardware guy is probably correct. I know on Stratix II I have to be careful how fast I run the remote update block or it doesn't work properly.

    Use a PLL to get the slower clock and connect this clock just to the remote update core. SOPC builder will automatically insert clock domain crossing logic between your nios processor and the remote_update core.

    Don't create another CPU. That's ridiculous.

    Jake