4.3.20. Bus ID register, SYS_BUSID

This register at 0x10000080 enables multiprocessor systems to identify the processor bus.

AXI bus

For AXI buses, the AXI port used to create the read will append its own ID bits for forwarded accesses from the matrix. This value is returned on a read.

AHB bus

For AHB buses the returned value is passed from the HSEL input into the bus matrix.

Figure 4.13. SYS_BUSID register

To view this graphic, your browser must support the SVG format. Either install a browser with native support, or install an appropriate plugin such as Adobe SVG Viewer.


Table 4.24. Bus ID

BitsAccessDescription
[31:6]-

Reserved. Use read-modify-write to preserve value.

[5:0]Read-onlyResponds with ID of the bus that the access was made with.

Copyright © 2005-2011 ARM Limited. All rights reserved.ARM DUI 0411D
Non-Confidential