AMBA Design Kit Technical Reference Manual 3.13. Asynchronous AHB-AHB bridge

3.13. Asynchronous AHB-AHB bridge

The asynchronous AHB-AHB bridge, Ahb2AhbAsync32 and Ahb2AhbAsync64, provides a unidirectional link between two AHB domains with asynchronous clocks. Its function is to enable a master to access a slave on another bus, with the transfer initiated from one side only. The asynchronous bridge is not intended for performance applications, because the synchronization logic increases the overhead of a registered bridge design.

The asynchronous AHB-AHB bridge has the following features:

32 or 64-bit data bus
transfer sequences can be locked across the bridge
bursts are split into single transfers to prevent excessive latency from BUSY transfers
SPLIT and RETRY responses are serviced by the bridge, so remain local to the issuing slave.

Figure 3.31 shows the asynchronous AHB-AHB bridge module.

Figure 3.31. Asynchronous AHB-AHB bridge module components

Copyright © 2003, 2007 ARM Limited. All rights reserved.	ARM DDI 0243C
Non-Confidential
PDF version