W83877TF Datasheet, PDF (29/154 Pages) Winbond – I/O chip disk drive adapter

W83877TF
ND:
OW:
PCN:
POLL:
PRETRK:
R:
RCN:
R/W:
SC:
SK:
SRT:
ST0:
ST1:
ST2:
ST3:
WG:
Non-DMA Mode
Overwritten
Present Cylinder Number
Polling Disable
Precompensation Start Track Number
Record
Relative Cylinder Number
Read/Write
Sector/per cylinder
Skip deleted data address mark
Step Rate Time
Status Register 0
Status Register 1
Status Register 2
Status Register 3
Write gate alters timing of WE
2.1.9 FDC Instruction Sets
(1) Read Data
PHASE
Command
R/W
W
W
W
W
D7 D6 D5 D4 D3 D2 D1 D0
MT MFM SK
0
0
1
1
0
0
0
0
0
0 HDS DS1 DS0
---------------------- C ------------------------
---------------------- H ------------------------
W
W
W
W
W
Execution
---------------------- R ------------------------
---------------------- N ------------------------
-------------------- EOT -----------------------
-------------------- GPL -----------------------
-------------------- DTL -----------------------
Result
R
R
R
R
R
R
R
-------------------- ST0 -----------------------
-------------------- ST1 -----------------------
-------------------- ST2 -----------------------
---------------------- C ------------------------
---------------------- H ------------------------
---------------------- R ------------------------
---------------------- N ------------------------
REMARKS
Command codes
Sector ID information
prior to command
execution
Data transfer between the
FDD and system
Status information after
command execution
Sector ID information
after command execution
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Publication Release Date: March 1998
Version 0.61