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

Functional OverviewPrimeCell General Purpose Input/Output (GPIO) (PL061)• sixteen individually-programmable input/output pins, eight input, eight output,with enables for usage as eight input/output pins when combined with externaltristate drivers• control word read-back capability• additional test registers and modes implemented for functional verification andmanufacturing test.2.2.3 Behavioral modelsThis section summarizes the behavioral models. For more details see Chapter 5Behavioral Models.Internal memory• 32 or 64-bit wide on-chip SRAM model• memory can be initialized from an ASCII file• variable size (default 1KB).Test interface driver• reads test input file• outputs vectors to the test interface controller• checks read data from the test interface controller against expected valuesFile reader master (32 or 64-bit)• enables generation of legal AHB transactions from an external stimulus file• interfaces through the AHB-Lite to AHB wrapper.2-6 Copyright © 2003, 2007 ARM Limited. All rights reserved. ARM DDI 0243C