Cyclone® V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683375
Date 10/18/2023
Document Table of Contents

3.5.2. Pre-Adder

Cyclone® V Devices

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

  • Two independent 19-bit pre-adders
  • One 27-bit pre-adder

The pre-adder supports both addition and subtraction in the following input configurations:

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