Texas Instruments PCI7411, PCI7611, PCI7621, PCI7421 ExCA Interrupt and General Control Register

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	7	6	5		4	3	2	1	0
Name				ExCA interrupt and general control
Type	RW	RW	RW		RW	RW	RW	RW	RW
Default	0	0	0		0	0	0	0	0

Register: 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
			Card ring indicate enable. Enables the ring indicate function of the BVD1/RI	terminals. This bit is encoded
7	RINGEN	RW	as:
			0 = Ring indicate disabled (default)
			1 = Ring indicate enabled
			Card reset. This bit controls the 16-bit PC Card RESET signal, and allows host software to force a card
6 †	RESET	RW	reset. This bit affects 16-bit cards only. This bit is encoded as:
			0 = RESET signal asserted (default)
			1 = RESET signal deasserted.
			Card type. This bit indicates the PC Card type. This bit is encoded as:
5 †	CARDTYPE	RW	0 = Memory PC Card is installed (default)
			1 = I/O PC Card is installed
			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
4	CSCROUTE	RW	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.
			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
3−0	INTSELECT	RW	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.

5−8