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參數(shù)資料
| 型號(hào)： | IT8700F |
| 英文描述： | Simple LPC I/O|Initialization (early I/O) |
| 中文描述： | 簡(jiǎn)單LPC的I / O |初始化（早期I / O） |
| 文件頁(yè)數(shù)： | 1/1頁(yè) |
| 文件大?。?/td> | 16K |
| 代理商： | IT8700F |
Integrated Technology Express, Inc.
ITTM-AN-01019
By : Moses
Check : Gary
Page
1
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IT8702F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Super-Low Pin Count Input/Output (LPC I/O) |
| IT8705AF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Simple Low Pin Count Input/Output (simple LPC I/O) |
| IT8705F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Simple Low Pin Count Input/Output (simple LPC I/O) |
| IT8706R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Special General Purpose I/O |
| IT8707F/AX | 制造商:INTEGRATED TECHNOLOGY EXPRESS INC 功能描述:CONTROLLER MISCELLANEOUS |
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