Article ID: 000075480 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Why can't I implement two multiply accumulator (MAC) blocks within the Stratix DSP block when using the shiftout register feature?

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BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description If you use the shiftout register feature in Stratix® device DSP blocks, the bottom multiply-accumulate block becomes unusable if the shiftout signals are driven to regular routing instead of the dedicated DSP block routing. There are not enough outputs to accomodate both the shiftout signals and the second multiply-accumulate outputs.

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Stratix® FPGAs