PCI6421 datasheet(133/204 Pages) TI

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5−21

5.19 ExCA Card Detect and General Control Register

This register controls how the ExCA registers for the socket respond to card removal. It also reports the status of the

VS1 and VS2 signals at the PC Card interface. Table 5−14 describes each bit in the ExCA card detect and general

control register.

Bit

Name

ExCA card detect and general control

Type

Default

ExCA card detect and general control

Offset:

CardBus Socket Address + 816h:

Card A ExCA Offset 16h

Card B ExCA Offset 56h

Type:

Read-only, Write-only, Read/Write

Default:

XX00 0000b

Table 5−14. ExCA Card Detect and General Control Register Description

BIT

SIGNAL

TYPE

FUNCTION

7 †

VS2STAT

VS2. This bit reports the current state of the VS2 signal at the PC Card interface, and, therefore, does not

have a default value.

0 = VS2 is low.

1 = VS2 is high.

6 †

VS1STAT

VS1. This bit reports the current state of the VS1 signal at the PC Card interface, and, therefore, does not

have a default value.

0 = VS1 is low.

1 = VS1 is high.

SWCSC

Software card detect interrupt. If card detect enable, bit 3 in the ExCA card status change interrupt

configuration register (ExCA offset 805h, see Section 5.6) is set, then writing a 1 to this bit causes a

card-detect card-status-change interrupt for the associated card socket.

If the card-detect enable bit is cleared to 0 in the ExCA card status-change interrupt configuration register

(ExCA offset 805h, see Section 5.6), then writing a 1 to the software card-detect interrupt bit has no effect.

This bit is write-only.

A read operation of this bit always returns 0. Writing a 1 to this bit also clears it. If bit 2 of the ExCA global

control register (ExCA offset 81Eh, see Section 5.20) is set and a 1 is written to clear bit 3 of the ExCA

card status change interrupt register, then this bit also is cleared.

CDRESUME

Card detect resume enable. If this bit is set to 1 and a card detect change has been detected on the CD1

and CD2 inputs, then the RI_OUT output goes from high to low. The RI_OUT remains low until the card

status change bit in the ExCA card status-change register (ExCA offset 804h, see Section 5.5) is cleared.

If this bit is a 0, then the card detect resume functionality is disabled.

0 = Card detect resume disabled (default)

1 = Card detect resume enabled

3−2

RSVD

These bits return 0s when read. Writes have no effect.

REGCONFIG

to a card removal event. This bit is encoded as:

0 = No change to ExCA registers upon card removal (default)

1 = Reset ExCA registers upon card removal

RSVD

This bit returns 0 when read. A write has no effect.

† One or more bits in this register are 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.

PCI6421 Datasheet(PDF) 133 Page - Texas Instruments

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