For Information Equipment

MN89302

Pin Descriptions (continued)

Pin No.

Symbol

I/O

Level

Function Description

94

LCAS

O

CMOS

Lower Column Address Strobe (LCAS)

This output is the strobe signal for the lower column address

latch. In the 2WE mode, however, it functions as the LWE

signal.

92

WE

O

CMOS

Write Enable

This output is the data write signal. In the 2WE mode, however,

it functions as the UWE signal.

112 to 97

MD[15:0]

I/O

TTL

Memory Data

These pins represent the data bus to the DRAM.

26

BIOSEN

O

CMOS

BIOS Enable

This output enables ROM BIOS output.

49

BACKON

O

CMOS

Backlight ON

This output requests backlighting.

"L" level: OFF; "H" level: ON

50

LCDON

O

CMOS

LCD Drive ON

This output requests power-ON for the LCD panel.

"L" level: OFF; "H" level: ON

51

LOGICON

O

CMOS

LCD Logic ON

This output requests power-ON for LCD panel logic circuits.

"L" level: OFF; "H" level: ON

56

LP

O

CMOS

Line Pulse

This output provides pulses indicating the end of a line of the

LCD panel.

55

FP

O

CMOS

Frame Pulse

This output provides pulses indicating the start of a frame of the

LCD panel.

54

DISP

O

CMOS

Display Enable

This output enables the LCD display. An external RAMDAC

uses this signal as a blanking signal. A TFT LCD uses it as an

enable signal.

57

DCLK

O

CMOS

Data Shift Clock

This pin provides a data shift clock signal for an STN LCD panel

or a dot clock signal for a TFT LCD panel or external RAMDAC.

77 to 70

UD[7:0]

O

CMOS

Upper Data[7:0]

67 to 60

LD[7:0]

O

CMOS

Lower Data[7:0]

This pins provide display data. Usage varies with the LCD panel

type.