PCI6421 datasheet(138/204 Pages) TI

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6−2

6.1

Socket Event Register

This register indicates a change in socket status has occurred. These bits do not indicate what the change is, only

that one has occurred. Software must read the socket present state register for current status. Each bit in this register

can be cleared by writing a 1 to that bit. The bits in this register can be set to a 1 by software through writing a 1 to

the corresponding bit in the socket force event register. All bits in this register are cleared by PCI reset. They can be

immediately set again, if, when coming out of PC Card reset, the bridge finds the status unchanged (i.e., CSTSCHG

reasserted or card detect is still true). Software needs to clear this register before enabling interrupts. If it is not cleared

and interrupts are enabled, then an unmasked interrupt is generated based on any bit that is set. See Table 6−2 for

a complete description of the register contents.

Bit

Name

Socket event

Type

Default

Bit

Name

Socket event

Type

RWC

Default

Socket event

Offset:

CardBus Socket Address + 00h

Type:

Read-only, Read/Write to Clear

Default:

0000 0000h

Table 6−2. Socket Event Register Description

BIT

SIGNAL

TYPE

FUNCTION

31−4

RSVD

These bits return 0s when read.

3†

PWREVENT

RWC

Power cycle. This bit is set when the PCI6x21/PCI6x11 controller detects that the PWRCYCLE bit in the

socket present state register (offset 08h, see Section 6.3) has changed. This bit is cleared by writing a 1.

2†

CD2EVENT

RWC

CCD2. This bit is set when the PCI6x21/PCI6x11 controller detects that the CDETECT2 field in the socket

present state register (offset 08h, see Section 6.3) has changed. This bit is cleared by writing a 1.

1†

CD1EVENT

RWC

CCD1. This bit is set when the PCI6x21/PCI6x11 controller detects that the CDETECT1 field in the socket

present state register (offset 08h, see Section 6.3) has changed. This bit is cleared by writing a 1.

0†

CSTSEVENT

RWC

CSTSCHG. This bit is set when the CARDSTS field in the socket present state register (offset 08h, see

Section 6.3) has changed state. For CardBus cards, this bit is set on the rising edge of the CSTSCHG

signal. For 16-bit PC Cards, this bit is set on both transitions of the CSTSCHG signal. This bit is reset by

writing a 1.

† This bit is cleared only by the assertion of GRST when PME is enabled. If PME is not enabled, then this bit is cleared by the assertion of PRST

or GRST.

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