PCI1221 datasheet(87/123 Pages) TI

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ExCA interrupt and general-control register (index 03h)

Bit

Name

ExCA interrupt and general control

Type

R/W

Default

ExCA interrupt and general control

Type:

Read/write (see individual bit descriptions)

Offset:

CardBus socket address + 803h; Card A ExCA offset 03h

Card B ExCA offset 43h

Default:

00h

Description: This register controls interrupt routing for I/O interrupts, as well as other critical 16-bit

PC Card functions. See Table 42 for a complete description of the register contents.

Table 42. ExCA Interrupt and General-Control Register (Index 03h)

BIT

SIGNAL

TYPE

FUNCTION

RINGEN

R/W

Card ring indicate enable. Bit 7 enables the ring indicate function of BVD1/RI. This bit is encoded as:

0 = Ring indicate disabled (default)

1 = Ring indicate enabled

RESET

R/W

Card reset. Bit 6 controls the 16-bit PC Card RESET, and allows host software to force a card reset. Bit 6

affects 16-bit cards only. This bit is encoded as

0 = RESET signal asserted (default)

1 = RESET signal deasserted

CARDTYPE

R/W

Card type. Bit 5 indicates the PC card type. This bit is encoded as:

0 = Memory PC Card installed (default)

1 = I/O PC Card installed

CSCROUTE

R/W

PCI Interrupt CSC routing enable bit. When bit 4 is set (high), the card status change interrupts are routed

to PCI interrupts. When low, the card status change interrupts are routed using bits 7–4 in the ExCA card

status change interrupt configuration register. This bit is encoded as:

0 = CSC interrupts are routed by ExCA registers (default).

1 = CSC interrupts are routed to PCI interrupts.

3-0

INTSELECT

R/W

Card interrupt select for I/O PC Card functional interrupts. Bits 3-0 select the interrupt routing for I/O

PC Card functional interrupts. This field is encoded as:

0000 = No interrupt routing (default).

0001 = IRQ1 enabled

0010 = SMI enabled

0011 = IRQ3 enabled

0100 = IRQ4 enabled

0101 = IRQ5 enabled

0100 = 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

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