PCI4451 datasheet(35/216 Pages) TI

35 / 216 page

2–17

Table 2–12. System Interrupt Terminals

TERMINAL

I/O

FUNCTION

NAME

GFN NO.

GJG NO.

I/O

FUNCTION

INTA

(MFUNC0)

W11

W10

I/O

Parallel PCI interrupt. INTA can be mapped to MFUNC0 when parallel PCI interrupts are

used.

See Section 3.5, Programmable Interrupt Subsystem, for details on interrupt signaling.

MFUNC0/INTA defaults to a general-purpose input.

INTB

(MFUNC1)

Y11

P10

I/O

Parallel PCI interrupt. INTB can be mapped to MFUNC1 when parallel PCI interrupts are

used.

See Section 3.5, Programmable Interrupt Subsystem, for details on interrupt signaling.

MFUNC1/INTB defaults to a general-purpose input.

INTC

(MFUNC2)

Y10

I/O

Parallel PCI interrupt. INTC can be mapped to MFUNC2 when parallel PCI interrupts are

used.

See Section 3.5, Programmable Interrupt Subsystem, for details on interrupt signaling.

MFUNC2/INTC defaults to a general-purpose input.

IRQSER

W13

P12

I/O

Serial interrupt signal. IRQSER provides the IRQSER-style serial interrupting scheme.

Serialized PCI interrupts can also be sent in the IRQSER stream. See Section 3.5,

Programmable Interrupt Subsystem, for details on interrupt signaling.

MFUNC6

MFUNC5

MFUNC4

MFUNC3

MFUNC2

MFUNC1

MFUNC0

V10

Y10

Y11

W11

P10

W10

Interrupt request/secondary functions multiplexed. The primary function of these terminals

is to provide programmable options supported by the PCI4451. These interrupt multiplexer

outputs can be mapped to various functions.

All of these terminals have secondary functions, such as PCI interrupts, PC/PCI DMA, OHCI

LEDs, GPE 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 multifunction routing.

See Section 4.36, Multifunction Routing Status Register, for programming options.

RI_OUT/PME

Y13

R11

Ring indicate out and power management event output. Terminal provides an output to the

system for ring-indicate or PME signals. Alternately, RI_OUT can be routed on MFUNC7.

Table 2–13. PC/PCI DMA Terminals

TERMINAL

I/O

FUNCTION

NAME

GFN NO.

GJG NO.

I/O

FUNCTION

PCGNT

(MFUNC2)

PCGNT

(MFUNC3)

Y10

V10

I/O

PC/PCI DMA grant. PCGNT is used to grant the DMA channel to a requester in a system

supporting the PC/PCI DMA scheme. PCGNT is available on MFUNC2 or MFUNC3.

This terminal is also used for the serial EEPROM interface.

PCREQ

(MFUNC7)

PCREQ

(MFUNC4)

PCREQ

(MFUNC0)

P20

W11

N19

W10

PC/PCI DMA request. PCREQ is used to request DMA transfers as DREQ in a system

supporting the PC/PCI DMA scheme. PCREQ is available on MFUNC7, MFUNC4, or MFUNC0.

This terminal is also used for the serial EEPROM interface.

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