PC87365 datasheet(21/215 Pages) NSC

21 / 215 page

1.0 Signal/Pin Connection and Description (Continued)

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1.4

DETAILED SIGNAL/PIN DESCRIPTIONS

This section describes all signals. Signals are organized in functional groups.

1.4.1

ACCESS.bus Interface (ACB)

1.4.2

Bus Interface

1.4.3

Clock

1.4.4

Fan Speed Control and Monitor (FSCM)

Signal

Pin(s)

I/O Buffer Type Power Well

Description

SCL

I/O

INSM/OD6

VDD

ACCESS.bus Clock Signal. An internal pull-up is optional,

depending upon the ACCESS.bus conﬁguration register.

SDA

I/O

INSM/OD6

VDD

ACCESS.bus Data Signal. An internal pull-up is optional,

depending upon the ACCESS.bus conﬁguration register.

Signal

Pin(s)

I/O Buffer Type Power Well

Description

LAD0-3

15-18

I/O

INPCI/OPCI

VDD

LPC Address-Data. Multiplexed command, address bi-

directional data and cycle status.

LCLK

INPCI

VDD

LPC Clock. Practically, the PCI clock (up to 33 MHz).

LDRQ

OPCI

VDD

LPC DMA Request. Encoded DMA request for LPC I/F.

LFRAME

INPCI

VDD

LPC Frame. Low pulse indicates the beginning of new LPC

cycle or termination of a broken cycle.

LRESET

INPCI

VDD

LPC Reset. Practically, the PCI system reset.

PIRQ3-7

PIRQ9-12

PIRQ14-15

117-121

122-125

126-127

INTS

VDD

Parallel Interrupt. Converts Parallel Port interrupts into Serial

Interrupts by means of the Interrupt Serializer.

SERIRQ

I/O

INPCI/OPCI

VDD

Serial IRQ. The interrupt requests are serialized over a single

pin, where each internal IRQ signal is delivered during a

designated time slot.

SMI

OD12

VDD

System Management Interrupt.

Signal

Pin(s)

I/O Buffer Type Power Well

Description

CLKIN

INT

VDD

Clock In. 48 MHz clock input.

Signal

Pin(s)

I/O Buffer Type Power Well

Description

FANIN0

FANIN1

FANIN2

128

INTS

VDD

Fan Inputs. Used to feed the fan’s tachometer pulse to the Fan

Speed Monitor. The rising edge indicates the completion of a half

(or full) revolution of the fan.

FANOUT0

FANOUT1

FANOUT2

O2/14

VDD

Fan Outputs. Pulse Width Modulation (PWM) signals, used to

control the speed of cooling fans by controlling the voltage

supplied to the fan’s motor.

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