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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: 46/154頁
文件大小: 821K
代理商: W83877TF
W83877TF
Publication Release Date: March 1998
- 36 -
Version 0.61
Status Register 2 (ST2)
1
2
3
4
5
6
7
0
BC (Bad Cylinder)
1 Bad Cylinder
0 No error
SN (Scan Not satisfied)
1 During execution of the Scan command
0 No error
SH (Scan Equal Hit)
1 During execution of the Scan command, if the equal condition is satisfied
0 No error
WC (Wrong Cylinder)
1 Indicates wrong Cylinder
DD (Data error in the Data field)
1 If the FDC detects a CRC error in the data field
0 No error
CM (Control Mark)
1 During execution of the read data or scan command
0 No error
Not used. This bit is always 0
MD (Missing Address Mark in Data Field).
1 If the FDC cannot find a data address mark
(or the address mark has been deleted)
when reading data from the media
Status Register 3 (ST3)
1
2
3
4
5
6
7
0
US0 Unit Select 0
US1 Unit Select 1
HD Head Address
TS Two-Side
TO Track 0
RY Ready
WP Write Protected
FT Fault
2.2.8 Digital Input Register (DI Register) (Read base address + 7)
The Digital Input Register is an 8-bit read-only register used for diagnostic purposes. In a PC/XT or
AT only Bit 7 is checked by the BIOS. When the register is read, Bit 7 shows the complement of
DSKCHG
,
while other bits of the data bus remain in tri-state. Bit definitions are as follows:
x
x
Reserved for the hard disk controller
During a read of this register, these bits are in tri-state
DSKCHG
x
x
x
x
x
x
0
1
2
3
4
5
6
7
In the PS/2 mode, the bit definitions are as follows:
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參數描述
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