Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 4/01/2024
Public
Document Table of Contents

5.1.6.3.2. Descriptor Endianness

The descriptor addresses must be aligned to the used bus width (word, dword, or lword for 64-bit). The data bus can be configured for either little-endian or big-endian format. The table below provides information on the structure of the normal descriptor with respect to the data bus endianness.
Table 119.  Descriptor Endianness

Data Bus Endianness

Descriptor Endianness

Description

Little-endian

Same-endian

RX/TX descriptors in same-endian mode for 64-bit, little-endian data bus

Big-endian

Reverse-endian

RX/TX descriptors in reverse-endian mode for 64-bit, big-endian data bus