SMC Networks ARM PL241 - Manual (Page 22)

Functional Overview
2-2 Copyright © 2006 ARM Limited. All rights reserved. ARM DDI 0389B
2.1 Functional description
Figure 2-1 shows an AHB MC (PL241) configuration.
Figure 2-1 AHB MC (PL241) configuration
This section is divided into:
• AHB interface
• AHB to APB bridge
• Clock domains on page 2-3
• Low-power interface on page 2-3
• SMC on page 2-4.
2.1.1 AHB interface
The AHB MC fully supports the AMBA AHB 2.0 specification. This interface
component converts the incoming AHB transfers to the required transfers of the internal
interconnect protocol. Because of the design of the internal interconnect, some
optimizations are made in the interface to improve performance.
See AHB interface operation on page 2-7 for more information.
2.1.2 AHB to APB bridge
The internal memory controllers of the AHB MC use the AMBA3 APB protocol for
their configuration ports. To enable the AHB MC to externally function as an AHB
device, the APB configuration ports are connected to an AHB to APB bridge. The
bridge converts incoming AHB transfers from the configuration port to the APB
transfers that the internal memory controller requires. This bridge is part of the
PrimeCell infrastructure components, part BP127.
See AHB to APB bridge operation on page 2-10 for more information.
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