Multiply-Add and Multiply-Accumulate Implementation - 2022.1 English

Vivado Design Suite User Guide: Synthesis (UG901)

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2022.1 English

During Multiply-Add and Multiply-Accumulate implementation:

Vivado synthesis can implement an inferred Multiply-Add or Multiply-Accumulate macro on DSP block resources.

Vivado synthesis attempts to take advantage of the pipelining capabilities of DSP blocks.

Vivado synthesis pulls up to:

°Two register stages present on the multiplication operands.

°One register stage present after the multiplication.

°One register stage found after the Adder, Subtractor, or Adder/Subtractor.

°One register stage on the add/sub selection signal.

°One register stage on the Adder optional carry input.

Vivado synthesis can implement a Multiply Accumulate in a DSP block if its implementation requires only a single DSP resource.

If the macro exceeds the limits of a single DSP then Vivado synthesis does the following:

°Processes it as two separate Multiplier and Accumulate macros.

°Makes independent decisions on each macro.