PERPENDICULAR MODE
DATA BUS
PHASE
R/W
REMARKS
D7
0
D6 D5 D4 D3 D2
D1
D0
Command
W
0
0
0
1
0
0
1
0
Command Codes
OW
D3 D2 D1 D0
GAP WGATE
INVALID CODES
DATA BUS
PHASE
R/W
REMARKS
D7 D6 D5 D4 D3 D2 D1 D0
Command
W
Invalid Codes
Invalid Command Codes (No
Op - FDC37C669 goes into
Standby State)
Result
R
ST0
ST0 = 80H
LOCK
DATA BUS
PHASE
Command
Result
R/W
W
REMARKS
D7
LOCK
0
D6 D5
D4
1
D3 D2 D1 D0
0
0
0
0
0
0
1
0
0
0
0
0
Command Codes
R
LOCK
SC is returned if the last command that was issued was the Format command. EOT is returned if the
last command was a Read or Write.
These bits are used internally only. They are not reflected in the Drive Select pins. It is the
NOTE:
user's responsibility to maintain correspondence between these bits and the Drive Select pins (DOR).
56
SMSC [ SMSC CORPORATION ]
