w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 40

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

Status Register 1 (ST1)
Status Register 2 (ST2)
Status Register 3 (ST3)
7
6
7
5
6
4
5
3
4
2
3
7
1
2
6
0
1
5
Missing Address Mark. 1 When the FDC cannot detect the data address mark
or the data address mark has been deleted.
NW (Not Writable). 1 If a write Protect signal is detected from the diskette drive during
execution of write data.
ND (No DATA). 1 If specified sector cannot be found during execution of a read, write or verifly data.
Not used. This bit is always 0.
OR (Over Rum). 1 If the FDC is not serviced by the host system within a certain time interval during data transfer.
DE (data Error).1 When the FDC detects a CRC error in either the ID field or the data field.
EN (End of track). 1 When the FDC tries to access a sector beyond the final sector of a cylinder.
Not used. This bit is always 0.
0
4
3
1 If the FDC detects a CRC error in the data field
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
0 No error
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)
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
-39 -
2
1
0
US0 Unit Select 0
US1 Unit Select 1
HD Head Address
TS Two-Side
TO Track 0
WP Write Protected
FT Fault
RY Ready
Publication Release Date: April 1998
W83977ATF
PRELIMINARY
Revision 0.52