DDR Bandwidth Read Utilization - 2022.2 English

Vitis Guidance Messaging (UG1315)

Document ID
UG1315
Release Date
2022-10-19
Version
2022.2 English

Description

This rule checks indicates the associated DDR memory bank has low read bandwidth usage.

Explanation

Low read bandwidth usage indicates that the kernel is not reading the data from the DDR memory at the maximum potential. This impacts the time to read from the DDR memory. The read bandwidth usage is mainly dependent on transfer rate, which is the total bytes transferred to the DDR memory per bus active time.

Resolution

To improve the read bandwidth usage, improve the total bytes transferred and decrease the maxi bus active time.

To improve the total bytes transferred, increase the port width size on the interface to 512.

To improve the DDR memory per bus active time, use more burst access instead of single access on the AXI.