Intel® Agilex™ Variable Precision DSP Blocks User Guide

ID 683037
Date 11/17/2022

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2.1.6. Adder or Subtractor for Fixed-point Arithmetic

Depending on the operational mode, you can use the adder or subtractor as one 38-bit adder for fixed-point arithmetic addition or subtraction between two multipliers within a DSP block.

Use the dynamic SUB port to select the adder to perform addition or subtraction operation.
Table 6.  Adder Operations with SUB Dynamic Control Signal
Operation Description SUB Signal
Addition Adds the results of the two multipliers within one DSP block. 0
Subtraction Subtracts the results between two multipliers within the same DSP block. 1