W83977TF
PRELIMINARY
(16) Dumpreg
PHASE
Command
Result
R/W
W
R
R
R
R
R
R
R
R
R
R
D7
0
D6
0
D5
0
D4
0
1
D3
1
D2
1
D1
0
D0
REMARKS
Registers placed in FIFO
----------------------- PCN-Drive 0--------------------
----------------------- PCN-Drive 1 -------------------
----------------------- PCN-Drive 2--------------------
----------------------- PCN-Drive 3 -------------------
--------SRT ------------------ | --------- HUT --------
----------- HLT -----------------------------------| ND
------------------------ SC/EOT ----------------------
LOCK 0
D3
D2
D1
D0 GAP
WG
0 EIS EFIFO POLL | ------ FIFOTHR --------
-----------------------PRETRK -------------------------
(17) Perpendicular Mode
PHASE
Command
R/W
W
W
(18) Lock
PHASE
Command
Result
R/W
W
R
D7
0
D6
0
D5
0
0
D4
1
LOCK
D3
0
0
1
0
D2
0
0
D1
0
0
D0
REMARKS
Command Code
D7
0
OW
D6
0
0
D5
0
D3
D4
1
D2
D3
0
D1
D2
0
1
D1
0
D0
REMARKS
Command Code
D0 GAP WG
LOCK 0
(19) Sense Drive Status
PHASE
Command
Result
R/W
W
W
R
D7
0
0
D6
0
0
D5
0
0
D4
0
0
0
D3
0
D2
1
0
D1
0
D0
REMARKS
Command Code
Status information about
disk drive
HDS DS1 DS0
---------------- ST3 -------------------------
(20) Invalid
PHASE
Command
Result
R/W
W
R
D7
D6
D5
D4
D3
D2
D1
D0
REMARKS
Invalid codes (no operation-
FDC goes to standby state)
ST0 = 80H
------------- Invalid Codes -----------------
-------------------- ST0 ----------------------
-28-
Publication Release Date: April 1998
Revision 0.62