W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 35

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

(17) Perpendicular Mode
(18) Lock
(19) Sense Drive Status
(20) Invalid
5.2
There are several status, data, and control registers in W83977F/G, W83977AF/AG. These registers
are defined below:
Command
Command
Result
Command
Result
Command
Result
PHASE
PHASE
PHASE
PHASE
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
Register Descriptions
base address + 0
base address + 1
base address + 2
base address + 3
base address + 4
base address + 5
base address + 7
ADDRESS
OFFSET
R/W
R/W
R/W
R/W
W
W
W
R
W
W
W
R
R
LOCK 0
OW
0
0
0
0
D7
D7
D7
D7
0
0
0
0
0
------------- Invalid Codes -----------------
---------------- ST3 -------------------------
D6
D6
-------------------- ST0 ----------------------
D6
D6
D3
0
0
0
0
0
D5
D5
D5
D5
DT (FIFO) REGISTER
LOCK
D2
1
0
1
0
SB REGISTER
MS REGISTER
SA REGISTER
TD REGISTER
DI REGISTER
D4
D4
D4
D4
0
D1
0
0
0
0
READ
-27 -
D3
D3
D3
D3
HDS DS1 DS0
D0 GAP WG
1
0
0
1
D2
D2
D2
D2
1
0
0
0
D1
D1
D1
D1
REGISTER
0
0
0
0
D0
D0
D0
D0
Publication Release Date: May 2006
Invalid codes (no operation-
FDC goes to standby state)
ST0 = 80H
Status information about disk
drive
Command Code
Command Code
DT (FIFO) REGISTER
Command Code
DO REGISTER
DR REGISTER
CC REGISTER
TD REGISTER
WRITE
REMARKS
REMARKS
REMARKS
REMARKS
Revision 0.60