AMBA Design Kit Technical Reference Manual - ARM Information ...

Functional Overview2.2 ADK componentsThe ADK is made up of components that are summarized in the following sections:• AHB components• APB components on page 2-5• Behavioral models on page 2-6.2.2.1 AHB componentsThis section summarizes the AHB components. For more details see Chapter 3 AHBComponents.Reset controller• generates a system-wide reset from power-on reset and watchdog reset signals.Arbiter• uses a simple priority algorithm to control the master that has access to the AHBbus• provides three masters plus dummy• arbitration scheme defined in a separate sub-block for easy modification andreuse.Retry slave, 32 or 64-bit• a starting point for a typical AHB slave design• simple four-word register bank plus read-only registers providing arithmeticcombinations of the writable registers• higher order address bits control the response• supports retry response and wait states.Static memory interface• AHB access to the external RAM and ROM• intended as a simple example• replaceable with PrimeCell Static Memory Controller (SMC) (PL241).ARM DDI 0243C Copyright © 2003, 2007 ARM Limited. All rights reserved. 2-3