FORMAT A TRACK
DATA BUS
PHASE
R/W D7
D6
MFM
0
D5 D4 D3
D2
D1
D0
REMARKS
Command
W
W
W
W
W
W
0
0
0
0
0
0
1
0
1
0
1
Command Codes
HDS DS1 DS0
──────── N ────────
Bytes/Sector
Sectors/Cylinder
Gap 3
──────── SC ────────
─────── GPL ───────
──────── D ────────
Filler Byte
Execution for
Each Sector
Repeat:
W
──────── C ────────
Input Sector Parameters
W
W
W
──────── H ────────
──────── R ────────
──────── N ────────
FDC formats an entire
cylinder
Result
R
─────── ST0 ───────
Status information after
Command execution
R
R
R
R
R
R
─────── ST1 ───────
─────── ST2 ───────
────── Undefined ──────
────── Undefined ──────
────── Undefined ──────
────── Undefined ──────
RECALIBRATE
DATA BUS
PHASE
R/W D7 D6 D5 D4 D3 D2
D1
D0
REMARKS
Command
W
W
0
0
0
0
0
0
0
0
0
0
1
0
1
1
Command Codes
DS1 DS0
Execution
Head retracted to Track 0
Interrupt.
SENSE INTERRUPT STATUS
DATA BUS
PHASE
Command
Result
R/W D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
Command Codes
W
R
0
0
0
0
1
0
0
0
─────── ST0 ───────
Status information at the end
of each seek operation.
R
─────── PCN ───────
SPECIFY
DATA BUS
PHASE
R/W D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
Command
W
W
W
0
0
0
0
0
0
1
1
Command Codes
─── SRT ───
─── HUT ───
────── HLT ──────
ND
SENSE DRIVE STATUS
DATA BUS
PHASE
R/W D7 D6 D5 D4 D3
D2
D1
D0
REMARKS
Command
W
W
R
0
0
0
0
0
0
0
0
0
0
1
0
0
Command Codes
HDS DS1 DS0
Result
─────── ST3 ───────
Status information about
FDD
SMSC LPC47B27x
- 42 -
Rev. 08-10-04
DATASHEET
SMSC [ SMSC CORPORATION ]
