W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 43

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

Status Register 0 (ST0)
Status Register 1 (ST1)
Status Register 2 (ST2)
7-6
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
7
7
5
6
6
5
4
4
3
5
3
4
2
2
3
1-0
1
2
US1, US0 Drive Select:
00 Drive A selected
01 Drive B selected
10 Drive C selected
11 Drive D selected
HD Head address:
1 Head selected
0 Head selected
NR Not Ready:
1 Drive is not ready
0 Drive is ready
EC Equipment Check:
1 When a fault signal is received from the FDD or the track
0 signal fails to occur after 77 step pulses
0 No error
SE Seek end:
1 seek end
0 seek error
IC Interrupt Code:
00 Normal termination of command
01 Abnormal termination of command
10 Invalid command issue
11 Abnormal termination because the ready signal from FDD changed state during command executio
0
1
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
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)
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
Not used. This bit is always 0
0 No error
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Publication Release Date: May 2006
Revision 0.60