PCI1251B Datasheet, PDF (14/126 Pages) Texas Instruments – PC CARD CONTROLLER

PCI1251B GFN/GJG
PC CARD CONTROLLER
SCPS043A – OCTOBER 1998
Terminal Functions (Continued)
Table 10. System Interrupt
TERMINAL
I/O
NAME
GFN NO. GJG NO. ^TYPE
GPIO3/INTA
V13
T12
I/O
IRQSER/INTB W13
W12
I/O
IRQMUX7
Y12
P11
IRQMUX6
U11
R10
IRQMUX5
W10
R9
IRQMUX4
Y9
IRQMUX3
W9
W9
T9
O
IRQMUX2
V9
R8
IRQMUX1
U9
T8
IRQMUX0
Y8
V8
RI_OUT/PME Y13
P12
O
FUNCTION
Parallel PCI interrupt. INTA can be optionally mapped to GPI03 when parallel PCI interrupts
are used.
See programmable interrupt subsystem on page 32 for details on interrupt signaling.
GPIO3/INTA defaults to a general-purpose input.
Serial interrupt signal. IRQSER provides the IRQSER-style serial interrupting scheme.
Serialized PCI interrupts can also be sent in the IRQSER stream. See programmable
interrupt subsystem on page 32 for details on interrupt signaling. This terminal can be used
to signal PCI INTB when one of the parallel interrupt modes is selected in the device control
register.
Interrupt request/secondary functions multiplexed. The primary function of these terminals
is to provide the ISA-type IRQ signaling supported by the PCI1251B. These interrupt
multiplexer outputs can be mapped to any of 15 IRQs. The device control register must be
programmed for the ISA IRQ interrupt mode and the IRQMUX routing register must have
the IRQ routing programmed before these terminals are enabled.
All of these terminals have secondary functions, such as PCI INTB, PC/PCI DMA
request/grant, ring indicate output, and zoomed video status, that can be selected with the
appropriate programming of this register. When the secondary functions are enabled, the
respective terminals are not available for IRQ routing.
See the IRQMUX routing register for programming options.
Ring indicate out and power management event output. Terminal provides an output for
ring-indicate or PME signals.
Table 11. PC/PCI DMA
TERMINAL
NAME GFN NO. GJG NO.
PCGNT/
IRQMUX6
U11
R10
PCREQ/
IRQMUX7
Y12
P11
I/O
TYPE
I/O
O
FUNCTION
PC/PCI DMA grant. PCGNT is used to grant the DMA channel to a requester in a system
supporting the PC/PCI DMA scheme.
Interrupt request MUX 6. When configured for IRQMUX6, this terminal provides the IRQMUX6
interrupt output of the interrupt multiplexer, and can be mapped to any of 15 ISA-type IRQs.
IRQMUX6 takes precedence over PCGNT, and should not be enabled in a system using
PC/PCI DMA.
This terminal is also used for the serial EEPROM interface.
PC/PCI DMA request. PCREQ is used to request DMA transfers as DREQ in a system
supporting the PC/PCI DMA scheme.
Interrupt request MUX 7. When configured for IRQMUX7, this terminal provides the IRQMUX7
interrupt output of the interrupt multiplexer, and can be mapped to any of 15 ISA-type IRQs.
IRQMUX7 takes precedence over PCREQ, and should not be enabled in a system using
PC/PCI DMA.
This terminal is also used for the serial EEPROM interface.
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