Adder Input Negation

Versal ACAP DSP Engine Architecture Manual (AM004)

Document ID
AM004
Release Date
2022-09-11
Revision
1.2.1 English

When FPOPMODE[5] (FPOPMODE[6]) is set to 1, it negates P0 (P1). Thus all four combinations of input negation are possible. See the following table.

Table 1. Adder Input Negation with FPOPMODE[6:5]
FPOPMODE[6] FPOPMODE[5] P
0 0 P0 + P1
0 1 P1 – P0
1 0 P0 – P1
1 1 –P0 – P1