PHASE
Command
FORMAT A TRACK
DATA BUS
R/W D7 D6 D5 D4 D3 D2 D1
W 0 MFM 0 0 1
1
0
D0
REMARKS
1 Command Codes
W 0 0 0 0 0 HDS DS1 DS0
W
- - - - - - - - N- - - - - - - -
Bytes/Sector
W
- - - - - - - - SC - - - - - - - -
Sectors/Cylinder
W
- - - - - - - GPL - - - - - - -
Gap 3
W
- - - - - - - - D- - - - - - - -
Filler Byte
Execution for
W
Each Sector
Repeat:
W
W
W
Result
R
R
R
R
R
R
R
- - - - - - - - C- - - - - - - -
- - - - - - - - H- - - - - - - -
- - - - - - - - R- - - - - - - -
- - - - - - - - N- - - - - - - -
- - - - - - - ST0 - - - - - - -
- - - - - - - ST1 - - - - - - -
- - - - - - - ST2 - - - - - - -
- - - - - - Undefined - - - - - -
- - - - - - Undefined - - - - - -
- - - - - - Undefined - - - - - -
- - - - - - Undefined - - - - - -
Input Sector
Parameters
FDC formats an entire
cylinder
Status information after
Command execution
PHASE
Command
Execution
RECALIBRATE
DATA BUS
R/W D7 D6 D5 D4 D3 D2 D1
W 000001 1
D0
REMARKS
1 Command Codes
W 0 0 0 0 0 0 DS1 DS0
Head retracted to Track 0
Interrupt.
SMSC DS – FDC37N869
Page 42
Rev. 11/09/2000