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 are 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, Vivado synthesis does the following:
- Processes it as two separate Multiplier and Accumulate macros.
- Makes independent decisions on each macro.