Article ID: 000078924 Content Type: Troubleshooting Last Reviewed: 02/26/2013

Why can't I pack two independent 18x18 multipliers into single ArriaV DSP block?

Environment

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

    Critical Issue

    Description Under certain conditions, the Quartus® II software may not be able pack two independent 18x18 multipliers into the same Arria® V DSP Block.  
    Resolution

    To work around this issue, add follow line into your quartus.ini file under the project directory:

    fsac_ff_enable_mac_scan_chain_packing=OFF

    If you do not already have a quartus.ini file, use the text editor and create this file in your project directory, then add the above line. 

    This is scheduled to be fixed in a future release of the Quartus II software.

    Related Products

    This article applies to 9 products

    Arria® V GT FPGA
    Arria® V GX FPGA
    Arria® V GZ FPGA
    Arria® V ST SoC FPGA
    Arria® V SX SoC FPGA
    Stratix® V E FPGA
    Stratix® V GS FPGA
    Stratix® V GT FPGA
    Stratix® V GX FPGA

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