W83977EF-AW datasheet(20/142 Pages) WINBOND

Part #	W83977EF-AW

Description	WINBOND ISA I/O

Download	142 Pages

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W83977EF-AW/W83977EG-AW

-18-

4.7 KBC Interface

SYMBOL

I/O

FUNCTION

KDATA

59

I/O16u

Keyboard Data

MDATA

60

I/O16u

PS2 Mouse Data

KCLK

67

I/O16u

Keyboard Clock

MCLK

68

I/O16u

PS2 Mouse Clock

GA20

56

I/O12t

KBC GATE A20 (P21) Output. (CR2A bit 6 = 0, default)

GP11

I/O12t

General purpose I/O port 1 bit 1. (CR2A bit 6 = 1)

(IRQIN2)

Alternate Function from GP11: Interrupt channel input.

KBRST

57

I/O12t

W83C45 Keyboard Reset (P20) Output. (CR2A bit 7 = 0, default)

GP12

I/O12t

General purpose I/O port 1 bit 2. (CR2A bit 7 = 1)

(WDTO)

Alternate Function 1 from GP12 : Watchdog timer output.

KBLOCK

58

INts

W83C45 KINH (P17) Input. (CR2B bit 0 = 0, default)

GP13

I/O16t

General purpose I/O port 1 bit 3. (CR2B bit 0 = 1)

4.8 POWER PINS

SYMBOL

FUNCTION

VCC

20, 55, 85,

115

+5V power supply for the digital circuitry

VSB

71

+5V stand-by power supply for the digital circuitry

GND

25, 62, 90,

120

Ground

4.9 ACPI Interface

SYMBOL

I/O

FUNCTION

VBAT

64

NA

battery voltage input

XTAL1

63

INC

32.768Khz Clock Input

XTAL2

61

O8t

32.768Khz Clock Output

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