The QoS register space starts at 0x400 and extends to 0x7FC. Each master interface that is configured to support QoS filtering contains the registers at the following offsets:

0x0  – QoS Tidemark

0x4  – QoS Access Control

When more than one master interface with QoS support is included, the register maps for each interface are stacked at 0x20 intervals. The AMBA Designer master interface number configuration option determines the address offset for any particular master interface.

It is recommended that you assign low master interface numbers to master interfaces that require QoS support. This approach aligns well with the cyclic priority scheme because master interfaces that require QoS support are typically those that can be considered high-ranking slaves.

There are two registers for each slave interface: