- Two independent 18-bit (signed/unsigned) pre-adders.
- One 26-bit pre-adder.
When you enable pre-adder in 18 × 18 multiplication modes, ay and az are used as the input bus to the top pre-adder while by and bz are used as the input bus to the bottom pre-adder. When you enable pre-adder in 27 × 27 multiplication mode, ay and az are used as the input bus to the pre-adder.
The pre-adder supports both addition and subtraction operations. When both pre-adders within the same DSP block are used, they must share the same operation type (either addition or subtraction).
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