PC87372 datasheet(18/144 Pages) NSC

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1.0 Signal/Pin Connection and Description (Continued)

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Revision 1.2

1.4.5

Keyboard and Mouse Controller (KBC)

1.4.6

General-Purpose I/O (GPIO)

1.4.7

Fan Speed Monitor (FSM)

Signal

Pin(s)

I/O Buffer Type Power Well

Description

KBCLK

I/O

INTS/OD14

VDD3

Keyboard Clock. Keyboard clock signal. External pull-up resistor

is required for PS/2 compliance. This pin is monitored during

VDD3 power-off for wake-up event detection.

KBDAT

I/O

INTS/OD14

VDD3

Keyboard Data. Keyboard data signal. External pull-up resistor is

required for PS/2 compliance. This pin is monitored during VDD3

power-off for wake-up event detection.

MCLK

I/O

INTS/OD14

VDD3

Mouse Clock. Mouse clock signal. External pull-up resistor is

required for PS/2 compliance. This pin is monitored during VDD3

power-off for wake-up event detection.

MDAT

I/O

INTS/OD14

VDD3

Mouse Data. Mouse data signal. External pull-up resistor is

required for PS/2 compliance. This pin is monitored during VDD3

power-off for wake-up event detection.

KBRST

I/O

INT/OD8,

O4/8

VDD3

KBD Reset. Keyboard reset (P20) quasi-bidirectional output.

GA20

I/O

INT/OD8,

O4/8

VDD3

Gate A20. KBC gate A20 (P21) quasi-bidirectional output.

Signal

Pin(s)

I/O Buffer Type Power Well

Description

GPIOE00-07 103-106,

108-109,

111-112

I/O

INTS/

OD8,O4/8

VSB3

General-Purpose I/O Ports. Each pin is configured

independently as input or I/O, with or without static pull-up and

with either open-drain or push-pull output type. These pins

have event detection capability to generate a wake-up event

or an interrupt.

GPIOE10-13 116, 114,

115, 113

GPIO14

101

I/O

INTS/

OD12,O2/12

General-Purpose I/O Port. This pin is configured

independently as input or I/O with or without static pull-up and

with either open-drain or push-pull output type.

Signal

Pin(s)

I/O Buffer Type Power Well

Description

FANTACH1

FANTACH2

111,

112

IINTS

VDD3

Fan Tachometer Inputs. Input to the Fan Speed Monitor for the

fan tachometer pulse. The rising edge indicates the completion of

either a half or full fan revolution.

PC87372 Datasheet(PDF) 18 Page - National Semiconductor (TI)

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