Datasheet > IT8700F

IT8700F

更新时间： 2022-01-19 04:07:00

品牌	Logo	应用领域
其他 - ETC		PC
页数	文件大小	规格书
1页	20K
描述
Simple LPC I/O\|Initialization (early I/O)

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IT8700F 数据手册

Integrated Technology Express, Inc.

Application Note of IT8700F

for Early I/O Initialization

Jun. 12, 2001

When the battery is installed on motherboard or the ATX power connector is plugged in the

motherboard, the bouncing glitches may be generated on “ VBAT” (from battery) or“ 5VSB”

(from ATX power supply). Such kind of bouncing glitches may cause the initialization of

“ Environment Controller Configuration Registers” of IT8700F to be unstable.

For preventing any abnormal behaviors of IT8700F, to program some bits of “ Environment

Controller Configuration Registers” to suitable value, after power-on and before POST

sequence, is necessary (We may call it as an “ Early I/O initialization” sequence.).

The registers which should be programmed to suitable values in the Early I/O

initialization are described as follows;

Environment Controller Configuration Registers (LDN=04h):

Index F0h = 00h

Index F1h = 00h

Index F2h = 00h

Index F3h = 00h

Index F4h = 00h

Index F5h = 00h (Especially, must Bit 7~6 = 00)

By the way, please also set

LDN0, Index F1h/ Bit 7 = 1

LDN3, Index F0h/ Bit 3 = 1 (If the POST Data Port function is used, please

still set LDN3/IndexF0/Bit3 to 1 after POST.)

Moreover, for 720K floppy diskette, please set

LDN5, Index 2Bh = F0h

LDN5, Index 2Ch = 08h

And set FIFO threshold of FDC to 0Fh.

ITTM-AN-01019

By : Moses

Check : Gary

Page 1

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