Article ID: 000084669 Content Type: Troubleshooting Last Reviewed: 09/27/2011

Unsupported Input Clock Frequencies Available in RapidIO Parameter Editor

Environment

  • Quartus® II Subscription Edition
  • BUILT IN - ARTICLE INTRO SECOND COMPONENT

    Critical Issue

    Description

    The RapidIO parameter editor offers the following unsupported input clock frequencies for RapidIO MegaCore functions that target a Cyclone IV GX device:

    • 78.125 MHz at data rate 1.250 Gbaud
    • 78.125 MHz and 500 MHz at data rate 2.500 Gbaud
    • 78.125 MHz, 97.65625 MHz, 195.3125 MHz, and 390.625 MHz at data rate 3.125 Gbaud

    If you select one of these input clock frequencies, the closest supported input clock frequency is implemented in the RapidIO MegaCore function variation.

    This issue affects all RapidIO variations that target a Cyclone IV GX device.

    The transceiver block in the RapidIO variation is configured with a different input clock frequency than the frequency you specified.

    Resolution

    Avoid selecting an unsupported input clock frequency in the RapidIO parameter editor.

    This issue is fixed in version 10.0 SP1 of the RapidIO MegaCore function.

    Related Products

    This article applies to 1 products

    Cyclone® IV FPGAs

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