BIT
NO.
0
SYMBOL
MA
NAME
Missing
DESCRIPTION
Any one of the following:
Address
Mark
1. The FDC did not detect an ID address mark at the specified track after
encountering the index pulse from the IDX pin twice.
2. The FDC cannot detect a data address mark or a deleted data address
mark on the specified track.
Table 33 - Status Register 2
BIT
NO.
7
SYMBOL
NAME
DESCRIPTION
Unused. This bit is always “0”.
6
CM
Control
Mark
Any one of the following:
1. Read Data command - the FDC encountered a deleted data address
mark.
2. Read Deleted Data command - the FDC encountered a data address
mark.
5
4
DD
Data Error The FDC detected a CRC error in the data field.
in Data
Field
WC
Wrong
Cylinder
The track address from the sector ID field is different from the track address
maintained inside the FDC.
3
2
1
Unused. This bit is always “0”.
Unused. This bit is always “0”.
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.
BC
Bad
Cylinder
0
MD
Missing
Data
Address
Mark
SMSC DS – FDC37N769
Page 30 of 137
Rev. 02-16-07
DATASHEET
SMSC [ SMSC CORPORATION ]
