This section summarizes the specific PC 98 power management requirements for PC Card. Power management requirements for specific device classes are defined in the related chapters in Part 4 of this guide.
17. Socket controller complies with device class power management reference specification
Required
This applies for both PC Card 16-only controllers and CardBus controllers.
The PC Card Controller Device Class Power Management Reference Specification, Version 1.0 or higher, provides class-specific definitions of the OnNow device power states (D0–D3) for these devices. The specification also covers device functionality expected in each power state and the possible wake-up event definitions for the class (for example, whether card insertion should wake the system).
18. PC Card 16 cards implement power-related events using ReqAttn bit and #STSCHG mechanism
Required
Any PC Card 16 card that is capable of signaling a wake-up event to the system (as defined in the device class power management reference specification for its class) must implement the ReqAttn bit and its associated enable bit in the Extended Status register , and must signal on the #STSCHG line.
19. CardBus controllers and cards implement power management specifications
Required
PCI-to-CardBus bridges must comply with the requirements defined in PCI Bus Power Management Interface Specification, Revision 1.0 or higher. CardBus cards must also comply with the requirements defined in PCI Bus Power Management Interface Specification, Revision 1.0 or higher.
The CardBus card must use the CSTSCHG pin to signal wake-up events. This is because there is no PME# pin on the CardBus interface, and the CardBus must use PME_EN in the card’s Configuration Space to enable wake-up events. Specifically, setting the PME_EN bit in the card’s Configuration Space must provide the same behavior as setting both the GWAK and WKUP bits in the card’s Function Event Mask register.
For more information about PCI power management specifications, see the “PCI” chapter in Part 3 of this guide.