PCI1211 datasheet(39/130 Pages) TI

39 / 130 page

PCI1211 GGU/PGE

PC CARD CONTROLLERS

SCPS033A – OCTOBER 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

suspend mode

The SUSPEND signal is provided for backward compatibility, and gates the PCI reset (RST) signal from the

PCI1211. However, additional functionality has been defined for SUSPEND to provide additional

power-management options.

SUSPEND provides a mechanism to gate the PCLK from the PCI1211, as well as gate RST. This can potentially

save power while in an idle state; however, it requires substantial design effort to implement. Some issues to

consider are:

D What if a card is present in the socket?

D What if the card in the socket is powered?

D How to pass CSC (insertion/removal) events.

Even without the PCI clock to the PCI1211 core, there are asynchronous-type functions (such as RI_OUT) that

can pass CSC events, wake-up events, etc., back to the system. Figure 16 is a functional implementation

diagram for SUSPEND.

PCI1211

Core

SUSPEND

RST

GNT

PCLK

SUSPENDIN

RSTIN

PCLKIN

INTERNAL SIGNALS

EXTERNAL SIGNALS

Figure 16. SUSPEND Functional Implementation

Figure 17 is a signal diagram of the suspend function.

PCI1211 Datasheet(PDF) 39 Page - Texas Instruments