PCI1420 Datasheet, PDF (100/137 Pages) Texas Instruments – PC Card Controllers

5.4 ExCA Interrupt and General Control Register (Index 03h)
The ExCA interrupt and general control 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
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
ExCA interrupt and general control
Read/Write
CardBus socket address + 803h; Card A ExCA offset 03h
Card B ExCA offset 43h
00h
Table 5–6. ExCA Interrupt and General Control Register (Index 03h)
BIT
SIGNAL TYPE
FUNCTION
Card ring indicate enable. Bit 7 enables the ring indicate function of BVD1/RI. This bit is encoded as:
7
RINGEN
R/W
0 = Ring indicate disabled (default)
1 = Ring indicate enabled
Card reset. Bit 6 controls the 16-bit PC Card RESET, and allows host software to force a card reset. Bit 6
6
RESET
R/W
affects 16-bit cards only. This bit is encoded as:
0 = RESET signal asserted (default)
1 = RESET signal deasserted
Card type. Bit 5 indicates the PC card type. This bit is encoded as:
5
CARDTYPE R/W
0 = Memory PC Card installed (default)
1 = I/O PC Card installed
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 (CSCSELECT field)
4 CSCROUTE R/W in the ExCA card status change interrupt configuration register (see Section 5.6). This bit is encoded as:
0 = CSC interrupts are routed by ExCA registers (default).
1 = CSC interrupts are routed to PCI interrupts.
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) . CSC interrupts routed to PCI interrupts. This bit setting is
OR’ed with bit 4 (CSCROUTE) for backwards compatibility.
0001 = IRQ1 enabled
0010 = SMI enabled
0011 = IRQ3 enabled
0100 = IRQ4 enabled
0101 = IRQ5 enabled
3–0 INTSELECT R/W
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
5–8