PCI6621 datasheet(120/204 Pages) TI

120 / 204 page

5−8

5.4

ExCA Interrupt and General Control Register

This register controls interrupt routing for I/O interrupts as well as other critical 16-bit PC Card functions. See

Table 5−6 for a complete description of the register contents.

Bit

Name

ExCA interrupt and general control

Type

Default

ExCA interrupt and general control

Offset:

CardBus Socket Address + 803h:

Card A ExCA Offset 03h

Card B ExCA Offset 43h

Type:

Read/Write

Default:

00h

Table 5−6. ExCA Interrupt and General Control Register Description

BIT

SIGNAL

TYPE

FUNCTION

RINGEN

Card ring indicate enable. Enables the ring indicate function of the BVD1/RI terminals. This bit is encoded

as:

0 = Ring indicate disabled (default)

1 = Ring indicate enabled

6 †

RESET

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

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

0 = RESET signal asserted (default)

1 = RESET signal deasserted.

5 †

CARDTYPE

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

0 = Memory PC Card is installed (default)

1 = I/O PC Card is installed

CSCROUTE

PCI interrupt − CSC routing enable bit. This bit has meaning only if the CSC interrupt routing control bit

(PCI offset 93h, bit 5) is 0. In this case, when this bit 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 (ExCA offset 805h, see Section 5.6). This bit is encoded

as:

0 = CSC interrupts routed by ExCA registers (default)

1 = CSC interrupts routed to PCI interrupts

If the CSC interrupt routing control bit (bit 5) of the diagnostic register (PCI offset 93h, see Section 4.40)

is set to 1, this bit has no meaning, which is the default case.

3−0

INTSELECT

Card interrupt select for I/O PC Card functional interrupts. These bits select the interrupt routing for I/O

PC Card functional interrupts. This field is encoded as:

0000 = No IRQ selected (default). CSC interrupts are routed to PCI Interrupts. This bit setting is ORed

with bit 4 (CSCROUTE) for backward compatibility.

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

† 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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