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參數資料
型號: W83877TF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設及接口
英文描述: Multi-Function I/O Port Controller(用于個人計算機的多功能輸入/輸出口控制器)
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封裝: QFP-100
文件頁數: 103/154頁
文件大小: 821K
代理商: W83877TF
W83877TF
Publication Release Date: March 1998
- 77 -
Version 0.61
FDD A type 1, 0 (Bit 1, 0):
These two bits select the type of FDD A.
00
Selects normal mode. When RWC = 0, the data transfer rate is 250 Kb/s. When
RWC = 1, the data transfer rate is 500 Kb/s.
Three mode FDD select (EN3MODE = 1):
01
RWC
= 0, selects 1.2 MB high-density FDD.
10
RWC = 1, selects 1.44 MB high-density FDD.
11
Don't care RWC
,
selects 720 KB double-density FDD.
8.2.9 Configuration Register 8 (CR8), default = 00H
When the device is in Extended Function mode and EFIR is 08H, the CR8 register can be accessed
through EFDR. The bit definitions are as follows:
7 6 5 4 3 2 1 0
Floppy Boot Drive 0
Floppy Boot Drive 1
Media ID 0
Media ID 1
SWWP
DISFDDWR
reserved
reserved
Bit 7 - bit 6: Reserved.
DISFDDWR (Bit 5):
This bit enables or disables FDD write data.
0
Enables FDD write
1
Disables FDD write (forces pins WE, WD to stay high)
Once this bit is set high, the FDC operates normally, but because pin WE
is inactive, the FDD will not
write data to diskettes. For example, if a diskette is formatted with DISFDDWR = 1, after the format
command has been executed, messages will be displayed that appear to indicate that the format is
complete. If the diskette is removed from the disk drive and inserted again, however, typing the DIR
command will reveal that the contents of the diskette have not been modified and the diskette was
not actually reformatted.
相關PDF資料
PDF描述
W83971D AC97 AUDIO CODEC
W83977AF PLUG & PLAY 1.0A COMPLIANT
W83977EF WINBOND I/O
W83977F PLUG & PLAY 1.0A COMPLIANT
W83977TF-AW I/O chip disk drive adapter
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