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UPD765B Datasheet(PDF) 12 Page - NEC

Part # UPD765B
Description  Single/Double Density Floppy-Disk Controller
PDF  17 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD765B Datasheet(HTML) 12 Page - NEC

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uPD765A/ uPD765B
Command Symbol Description (cont)
Command Symbol Description (cont)
SRT
SRT stands for the steooino rate for the FDD (1 to
(Step Rate Time)
16 ms in 1 ms increments). Stepping rate applies
to all drives (FH=1ms,
EH=2ms,
etc.).
STO-ST3
(Status O-3)
STO-ST3 stands for one of four registers which
store the status information after a command has
been executed. This information IS available
dur-
ing the result phase after command execution.
These registers should not be confused with the
main status register (selected by Ao=O).
STO-ST3 may be read only after a command has
been executed and contains
information relevant
to that particular command
Table 4. Instruction Set (Notes 1,2)
Name
Function
STP
US0, US1
(Unit Select)
During a scan operation if STP=1, the data in
contiguous sectors is compared byte by byte with
data sent from the processor (or DMA); and if
STP=2, then alternate sectorsare read and com-
pared
US stands for a selected drive number 0 or
3
Phase
Read Data
Command
Instruction
Code
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Remarks
w
MT
MF
SK
0
0
1
10
Command codes
W
X
X
X
X
X
HD
US1
US0
(Note 3)
W
C
Sector ID
prior to command execution
The 4 bytes
W
H
are compared against header on floppy disk.
w
R
W
N
W
EOT
w
GQL
w
DTL
Execution
Result
ST0
ST1
ST2
C
H
Data transfer between the FDD and main system
Status Information after command execution
Sector ID Information after command execution
RR
R
N
Read Deleted Data
Command
W
MT
MF
SK
0
1
1
0
0
Command codes
W
X
X
X
X
X
HD
US,
US0
W
C
Sector ID rnformation
to command execution
The 4 bytes
W
H
are compared against header on floppy disk
W
R
w
N
W
EOT
W
GPL
W
DTL
Execution
Data transfer between the FDD and main system
Result
ST0
ST1
ST2
C
H
Status information after command execution
Sector ID information after command execution
R
R
RR
N
Note:
(1) Symbols used in this table are described at the end of this section
(2) A0 should equal 1 for all operations.
(3) X = Don’t care, usually made to equal 0.



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