
W83977F/ W83977AF
PRELIMINARY
Publication Release Date: March 1998
-30-
Revision 0.58
(16) Dumpreg
PHASE
Command
Result
R/W
W
R
R
R
R
R
R
R
R
R
R
D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 1 1 1 0
----------------------- 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 -------------------------
REMARKS
Registers placed in FIFO
(17) Perpendicular Mode
PHASE
R/W
D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
Command
W
W
0 0 0 1 0 0 1 0
OW 0 D3 D2 D1 D0 GAP WG
Command Code
(18) Lock
PHASE
R/W
D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
Command
W
LOCK 0 0 1 0 1 0 0
Command Code
Result
R
0 0 0 LOCK 0 0 0 0
(19) Sense Drive Status
PHASE
Command
R/W
W
W
R
D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 1 0 0
0 0 0 0 0 HDS DS1 DS0
---------------- ST3 -------------------------
REMARKS
Command Code
Result
Status information about
disk drive
(20) Invalid
PHASE
R/W
D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
Command
W
------------- Invalid Codes -----------------
Invalid codes (no
operation- FDC goes to
standby state)
Result
R
-------------------- ST0 ----------------------
ST0 = 80H