RealView Emulation Baseboard User GuideHBI-0140 Rev C
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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

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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.

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