W83977EF-AW datasheet(13/142 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

Publication Release Date: Apr. 2006

-11-

Revision 1.2

4.2 General Purpose I/O Port

SYMBOL

I/O

FUNCTION

PWR_CTL#

69

OD16u

Power supply control

GP20

(KBRST)

I/O16tu

General purpose I/O port 2 bit 0.

Alternate Function from GP20: Keyboard reset (KBC P20)

SMI #

70

OD12t

For the power management, the SMI is active low by the power

management events, that generate and SCI in ACPI mode.

(CR2B bit 4_3 = 00, default)

GP21

I/O12t

General purpose I/O port 2 bit 1. (CR2B bit 4_3 = 01)

(P13)

Alternate Function from GP21: KBC P13 I/O port.

P16

I/O12t

KBC P16 I/O port. (CR2B bit 4_3 = 10)

PANSWOT#

GP22

72

OD12t

I/O12t

Panel Switch output. (CR2B bit 5 = 0, default)

General purpose I/O port 2 bit 2. (CR2B bit 5 = 1)

(P14)

Alternate Function from GP22: KBC P14 I/O port.

PANSWIN#

GP23

73

INt

I/O12t

Panel Switch input. (CR2B bit 7_6 = 00, default)

General purpose I/O port 2 bit 3. (CR2B bit 7_6 = 01)

(P15)

Alternate Function from GP23: KBC P15 I/O port

SUSC#

(GA20)

39

INts

Suspend C input

Alternate Function from GP25: GATE A20 (KBC P21)

GP25

I/O12

General purpose I/O port 2 bit 5.

4.3 Serial Port Interface

SYMBOL

I/O

FUNCTION

CTSA#

CTSB#

41

48

INt

Clear To Send is the modem control input.

The function of these pins can be tested by reading Bit 4 of the

handshake status register.

DSRA#

DSRB#

42

49

INt

Data Set Ready. An active low signal indicates the modem or

data set is ready to establish a communication link and transfer

data to the UART.

RTSA#

43

I/O8t

UART A Request To Send. An active low signal informs the

modem or data set that the controller is ready to send data.

HEFRAS

During power-on reset, this pin is pulled down internally and is

defined as HEFRAS, which provides the power-on value for

CR26 bit 6 (HEFRAS). A 4.7 k

Ω is recommended if intends to

pull up. (select 370H as configuration I/O port

′s address)

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W83977EF-AW Datasheet(PDF) 13 Page - Winbond

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