GM82C803CN Datasheet, PDF (33/84 Pages) List of Unclassifed Manufacturers – 2.88 MB FDC/ Dual UARTs with FIFO/PIO(EPP/ ECP)/ IDE Interface/ S-IR/ PnP

GM82C803CN
Table 4-13. Status Register 2 (ST2)
Bit
Symbol
Name
7
Unused
6
CM
Control Mark
5
DE
Data Error
4
WC
Wrong Cylinder
3
SE
Scan Equal
2
SN
Scan Not
1
BC
Bad Cylinder
0
MA
Missing Address
Mark
Table 4-14. Status Register 3 (ST3)
Bit
Symbol
7
6
WP
5
4
TO
3
WP
2
HS
1,0
DS1,0
Name
Unused
Write Protected
Unused
Track 0
Write Protected
Head Select
Drive Select 1,0
Function
Always 0.
Any one of the following :
1. During Read Data command, the FDC encounters
a deleted data address mark.
2. During Read Deleted Data command , the FDC
encounters a data address mark.
The FDC detect a CRC error in data field.
The track address from the sector ID field is different
from the track address maintained inside the FDC.
During Scan command, the Equal condition satisfied.
During Scan command, the FDC cannot find a sector on
the cylinder which meets the desired condition.
The track address from the sector ID field is different from
the track address maintained inside the FDC and is equal to
FF(hex) which indicates a bad track with a hard error
according to the IBM soft-sectored format.
The FDC cannot detect a data address mark or a deleted
data address mark.
Function
Always 0.
Indicates the status of the WRTPRT pin.
Always 1.
Indicates the status of the TRK00 pin.
Same as Bit 6.
Same as Bit 2 of ST0.
Same as Bit 1,0 of ST0.