ARM Technical Support Knowledge Articles

How does AHB differ from AHB-lite?

Applies to: AHB

Answer

AHB-lite is a simplified version of the full AMBA 2 AHB specification, supporting only a single Master.

This removes the need for arbitration signals, HBUSREQ and HGRANT, and HRESP only needs to be 1 bit as SPLIT and RETRY slave responses are only used for multi-master support.

The removal of any arbitration logic also means the AHB Master HLOCK output (driven ahead of the LOCKed transfer address phase) needs to be retimed to be the address phase aligned HMASTLOCK signal (a function usually performed by the AHB arbiter).

Article last edited on: 2008-09-09 15:47:56

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