Visible to Intel only — GUID: kly1417415541896
Ixiasoft
3.2.2. Pre-adder
The pre-adder can be configured in the following configurations:
- 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).
Did you find the information on this page useful?
Feedback Message
Characters remaining: