GM82C765B Datasheet, PDF (24/36 Pages) Hynix Semiconductor – FLOPPY DISK SUBSYSTEM CONTROLLER

GM82C765B
TABLE 14. WRITE DELETED DATA
PHASE
COMMAND
R/W D7 D6 D5 D4
W MT MF 0 0
W
XX XX
D3 D2 D2 D0
REMARKS
1
X
0
HS
0
US1
1
US0
Command Codes
W
C
Sector ID information prior to
W
H
command execution. The four bytes
W
R
are compared against header on
W
N
floppy disk.
W
EOT
W
GPL
W
DTL
EXECUTION
Data transfer between FDD and main
system
RESULTS
R
R
R
R
R
R
R
STO
Status information after command
ST1
execution.
ST2
C
Sector ID information after command
H
execution.
R
N
TABLE 15. READ A TRACK
PHASE
COMMAND
R/W D7 D6 D5 D4
W
0 MF SK 0
W
XX XX
D3 D2 D2 D0
REMARKS
0
X
0
HS
1
US1
0
US0
Command Codes
W
C
W
H
Sector ID information prior to
W
R
command execution.
W
N
W
EOT
W
GPL
W
DTL
EXECUTION
RESULTS
R
R
R
R
R
R
R
Data transfer between FDD and main
system. FDD reads all data fields from
index hole to EOT
STO
Status information after command
ST1
execution.
ST2
C
Sector ID information after command
H
execution.
R
N
24