Intel® Stratix® 10 Variable Precision DSP Blocks User Guide

ID 683832
Date 8/13/2021
Public
Document Table of Contents

2.3. Pre-adder for Fixed-Point Arithmetic

Each variable precision DSP block has two 19-bit pre-adders. You can configure these pre-adders in the following configurations:

  • 18-bit (signed or unsigned) addition or 18-bit (signed) subtraction for 18 x 19 mode
  • 26-bit addition or subtraction for 27 x 27 mode

For 18 x 19 mode, 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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