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92 Software Developer’s Manual
PCI Local Bus Interface
4.7 CardBus Application (82541PI/GI/EI Only)
The 82541PI/GI/EI has some features to facilitate its use in a CardBus application, following
revision 7 of the PC Card specification.
To use the 82541PI/GI/EI on CardBus, an external flash memory is required. Configure the Base
Address Registers to 32-bit (required for CardBus) and enable CLKRUN in EEPROM. Setting
these bits also enables the CardBus Information Space (CIS) pointer in the PCI Configuration
Space. When enabled, the CIS pointer starts the first tuple of the CIS chain at byte address 20h in
the Flash device. The PC Card specification requires that this tuple be a CISTPL_LINKTARGET
tuple. The tuple chain can then continue within the memory.
When operating as a CardBus card, the 82541PI/GI/EI supports full functionality with the
exception of wake up.