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Altera_Forum
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12 years ago

Multi Device AS configuration scheme

Dear Sir,

In the multi-device AS configuration in which devices receive the same data with multiple .sof, nCONFIG, nSTATUS and CONF_DONE pins of Master and slave FPGA’s are shorted together. My questions are

1) What is the Purpose of shorting these pins.

2) This type of arrangement provides a single CONF_DONE of whole system. I want to monitor the CONF_DONE of each device separately on a LED. Is this possible in this type of configuration?

3) OR if i want to bring CONF_DONE of each device to master FPGA, what changes should I do?

Thanks in Advance.

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

    In this thread (see Post#2):

    http://www.alteraforum.com/forum/showthread.php?t=42710

    I analyzed the timing of Cyclone IV devices, with the first configured in AS mode, and the subsequent devices configured in PS mode. Because of the difference in clock edges between these modes, configuration timing can potentially be violated. I'd recommend performing the same analysis for your multi-device chain.

    Cheers,

    Dave