DDRC QOS Mechanism Overview

Transmission Type

Read direction: Low Priority Read (LPR), Variable Priority Read (VPR), High Priority Read (HPR)

Write direction: Priority Write (NPW), Variable Priority Write (VPW)

Transmission types:

Type	Direction	Has Dedicated CAM?	Support Timeout?
LPR	READ	No	No
VPR	READ	No	Yes
HPR	READ	Yes	No
NPW	WRITE	No	No
VPW	WRITE	No	Yes

QOS Mapping Relationships

According to the arqos/awqos signals of the AXI protocol, you can map the master transmission to different types, as follows:

You can map the region type of each port by configuring the PCFGQOS_n and PCFGWQOS_n registers, and the boundaries of each region are defined by level, refer to Related Register Descriptions.