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

ID 683213
Date 10/18/2023
Public
Document Table of Contents

3.4.2. Internal Coefficient and Pre-Adder

To use the pre-adder feature, all input data and multipliers must have the same clock setting.

The input cascade support is not available when you enable the pre-adder feature.

Table 20.  Internal Coefficient and Pre-Adder Features in Arria V Devices
Mode Arria® V GX, GT, SX, and ST Arria® V GZ
18-bit

The coefficient feature and pre-adder feature can be used independently.

The coefficient feature must be enabled when the pre-adder feature is enabled.

27-bit

The coefficient feature and pre-adder feature can be used independently.

The coefficient feature and pre-adder feature can be used independently.

With pre-adder enabled:

  • If the multiplicand input comes from dynamic input due to width limitation in the input registers—the input data width is restricted to 22 bits.
  • If the multiplicand input comes from the internal coefficients—the data width of the multiplicand is 27 bits.
Note: When you enable the pre-adder feature, all input data must have the same clock setting.