ARM Technical Support Knowledge Articles

Is it legal for an AHB wrapping burst to be aligned with respect to the total number bytes in the burst, such that it does not wrap?

Applies to: AHB, AMBA Design Kit (ADK)


Yes, this behavior is compliant with the AHB protocol.

Consider a four-beat wrapping burst of word (4-byte) transfers (which will wrap at 16-byte boundaries).

If the start address of the transfer is 0x30, then the burst consists of four transfers to addresses 0x30, 0x34, 0x38, and 0x3C. 

Again, although HBURST is set to WRAP4, the burst will not actually wrap, which is allowed.

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