F71872
3
2
NR
HD
R
-
Not ready.
0: Drive is ready
1: Drive is not ready.
R
R
-
-
Head address.
The current head address.
1-0 DS
Drive select.
00: Drive A selected.
01: Drive B selected.
10: Drive C selected.
11: Drive D selected.
Status Registers 1
Bit
Name
R/W Default
Description
7
EN
DE
OR
R
R
R
-
-
-
End of Track.
Set when the FDC tries to access a sector beyond the final sector of a cylinder.
6
4
Data Error.
The FDC detect a CRC error in either the ID field or the data field of a sector.
Overrun/Underrun.
Set when the FDC is not serviced by the host system within a certain time
interval during data transfer.
3
2
Reserved
ND
-
-
-
Unused. This bit is always “0”
R
No Data.
Set when the following conditions occurred:
1. The specified sector is not found during any read command.
2. The ID field cannot be read without errors during a READ ID command.
3. The proper sector sequence cannot be found during a READ TRACK
command.
1
0
NW
MA
R
R
-
-
No Writable
Set when WPT# is active during execution of write commands.
Missing Address Mark.
Set when the following conditions occurred:
1. Cannot detect an ID address mark at the specified track after
encountering the index pulse form the INDEX# pin twice.
2. Cannot detect a data address mark or a deleted data address mark on the
specified track.
Status Registers 2
Bit
Name
R/W Default
Description
7
6
Reserved
CM
-
-
-
Unused. This bit is always “0”.
R
Control Mark.
Set when following conditions occurred:
1. Encounters a deleted data address mark during a READ DATA command.
2. Encounters a data address mark during a READ DELETED DATA
command.
41
July, 2007
V0.28P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
