PCI1221 datasheet(41/123 Pages) TI

41 / 123 page

PCI1221 GHK/PDV

PC CARD CONTROLLERS

SCPS042 – JULY 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

suspend mode (continued)

PRST

GNT

SUSPEND

PCLK

PRSTIN

SUSPENDIN

PCLKIN

External Terminals

Internal Signals

Figure 18. Signal Diagram of Suspend Function

ring indicate

The RI_OUT output is an important feature in power management, allowing a system to go into a suspended

mode and wake up on modem rings and other card events. TI designed flexibility permits this signal to fit wide

platform requirements. RI_OUT on the PCI1221 can be asserted under any of the following conditions:

D A 16-bit PC Card modem in a powered socket asserts RI to indicate to the system the presence of an

incoming call.

D A powered down CardBus card asserts CSTSCHG (CBWAKE) requesting system and interface wake up.

D A CSC event occurs, such as insertion/removal of cards, battery voltage levels.

CSTSCHG from a powered CardBus card is indicated as a CSC event, not as a CBWAKE event. These two

RI_OUT events are enabled separately. Figure 15 shows various enable bits for the PCI1221 RI_OUT function;

however, it does not show the masking of CSC events. See Table 10 for a detailed description of CSC interrupt

masks and flags.

PCI1221 데이터시트(PDF) 41 Page - Texas Instruments