PCI7421 datasheet(138/298 Pages) TI

138 / 298 page

5−10

5.6

ExCA Card Status-Change Interrupt Configuration Register

This register controls interrupt routing for CSC interrupts, as well as masks/unmasks CSC interrupt sources. See

Table 5−8 for a complete description of the register contents.

Bit

Name

ExCA card status-change interrupt configuration

Type

Default

ExCA card status-change interrupt configuration

Offset:

CardBus Socket Address + 805h:

Card A ExCA Offset 05h

Card B ExCA Offset 45h

Type:

Read/Write

Default:

00h

Table 5−8. ExCA Card Status-Change Interrupt Configuration Register Description

BIT

SIGNAL

TYPE

FUNCTION

7−4

CSCSELECT

Interrupt select for card status change. These bits select the interrupt routing for card status-change

interrupts. This field is encoded as:

0000 = CSC interrupts routed to PCI interrupts if bit 5 of the diagnostic register (PCI offset 93h) is set

to 1b. In this case bit 4 of ExCA 803 is a don’t care. This is the default setting.

0000 = No ISA interrupt routing if bit 5 of the diagnostic register (PCI offset 93h) is set to 0b. In this case,

CSC interrupts are routed to PCI interrupts by setting bit 4 of ExCA 803h to 1b.

0001 = IRQ1 enabled

0010 = SMI enabled

0011 = IRQ3 enabled

0100 = IRQ4 enabled

0101 = IRQ5 enabled

0110 = IRQ6 enabled

0111 = IRQ7 enabled

1000 = IRQ8 enabled

1001 = IRQ9 enabled

1010 = IRQ10 enabled

1011 = IRQ11 enabled

1100 = IRQ12 enabled

1101 = IRQ13 enabled

1110 = IRQ14 enabled

1111 = IRQ15 enabled

3†

CDEN

Card detect enable. Enables interrupts on CD1 or CD2 changes. This bit is encoded as:

0 = Disables interrupts on CD1 or CD2 line changes (default)

1 = Enables interrupts on CD1 or CD2 line changes

2†

READYEN

Ready enable. This bit enables/disables a low-to-high transition on the PC Card READY signal to generate

a host interrupt. This interrupt source is considered a card status change. This bit is encoded as:

0 = Disables host interrupt generation (default)

1 = Enables host interrupt generation

1†

BATWARNEN

Battery warning enable. This bit enables/disables a battery warning condition to generate a CSC interrupt.

This bit is encoded as:

0 = Disables host interrupt generation (default)

1 = Enables host interrupt generation

0†

BATDEADEN

Battery dead enable. This bit enables/disables a battery dead condition on a memory PC Card or assertion

of the STSCHG I/O PC Card signal to generate a CSC interrupt.

0 = Disables host interrupt generation (default)

1 = Enables host interrupt generation

† 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.

PCI7421 Datasheet(PDF) 138 Page - Texas Instruments

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