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MKlee2's avatar
MKlee2
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7 years ago

Cyclone V Gbx Transceivers - can't fit more than 4, should be able to use 6? Error (14566): The Fitter cannot place 5 periphery component(s) due to conflicts with existing constraints (5 Channel PLL(s)).

Device: 5CSXFC6C6U23C7 Problem: I'm trying to use a transceiver with 5 channels (2.5Gbps preset with more channels), but the fitter throws me an error about occupied pll locations. From my unders...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
7 years ago
Hi Matthias, As I understand it, you observe some Fitter error during your compilation with CV XCVR design. As I check the CV part that you are using, there are total of 6 XCVR channels. By default, you should be able to implement maximum of 5 duplex XCVR with one channel reserved for CMU PLL. Would you mind to share a simple test design with Native PHY which could replicate the error observation so that I could further look into it? Thank you.
  • MKlee2's avatar
    MKlee2
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    7 years ago

    Thank you for your answer, attached is a simple test design.

    I believe it might be related to my pin planning/placing, maybe you point out what went wrong.

  • MKlee2's avatar
    MKlee2
    Icon for New Contributor rankNew Contributor
    7 years ago

    I played a bit around with my pin planning and it seems to work if I leave AB2/1 and Y2/1 free and use F2/1 D2/1 instead.

    Could you please tell me why I need to leave out this specific(?) pins? I also tried leaving out other pins on the same bank and use AB2... again,

    but this would result in an error again.