SEEK
DATA BUS
PHASE
R/W D7 D6 D5 D4 D3
D2
D1
D0
REMARKS
Command
W
W
W
0
0
0
0
0
0
0
0
1
0
1
1
1
Command Codes
HDS DS1 DS0
─────── NCN ───────
Execution
Head positioned over
proper cylinder on
diskette.
CONFIGURE
DATA BUS
PHASE
R/W D7 D6
D5
D4
D3
D2
D1
D0
REMARKS
Command
W
0
0
0
1
0
0
1
1
Configure
Information
W
W
W
0
0
0
0
0
0
0
0
0
EIS EFIFO POLL
─── FIFOTHR ───
Execution
───────── PRETRK ─────────
RELATIVE SEEK
DATA BUS
PHASE
R/W D7 D6 D5 D4 D3
D2
D1
D0
REMARKS
Command
W
W
W
1
0
DIR
0
0
0
0
0
1
0
1
1
1
HDS DS1 DS0
─────── RCN ───────
DUMPREG
DATA BUS
PHASE
R/W
D7
D6
D5
D4
D3 D2
D1
D0
REMARKS
Command
W
0
0
0
0
1
1
1
0
*Note:
Registers
placed in
FIFO
Execution
Result
R
R
R
R
R
R
R
R
R
R
────── PCN-Drive 0 ───────
────── PCN-Drive 1 ───────
────── PCN-Drive 2 ───────
────── PCN-Drive 3 ───────
──── SRT ────
─────── HLT ───────
─────── SC/EOT ───────
D3 D2 D1 D0 GAP
─── HUT ───
ND
LOCK
0
0
WGATE
EIS EFIFO POLL
── FIFOTHR ──
──────── PRETRK ────────
SMSC LPC47B27x
- 43 -
Rev. 08-10-04
DATASHEET
SMSC [ SMSC CORPORATION ]
