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參數(shù)資料
| 型號： | UPD765A |
| 廠商： | NEC Corp. |
| 英文描述： | Single/Double Density Floppy-Disk Controller |
| 中文描述： | 單/雙密度軟盤控制器 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大?。?/td> | 344K |
| 代理商： | UPD765A |
uPD765A/ uPD765B
Command Symbol Description
(cont)
Command Symbol Description
(cont)
Name
STP
SRT
(Step Rate Time)
SRT stands for the steooino rate for the FDD
(1
to
16 ms in 1 ms
increments). Stepping
rate applies
to all drives (FH=1ms,
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 maybe read only after a command has
been executed and
contains
information relevant
to that particular command
EH=2ms,
etc.).
S TO-S T3
(Status O-3)
Table
4.
Instruction
Set (Notes
1,2)
Function
US0,
US1
(Unit
Select)
During
a scan
operation
if
STP=1,
the data in
contiguous sectors
is compared byte by byte with
data sent fromthe 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
D4
R/W
D7
D6
D5
D3
D2
D1
D0
Remarks
w
W
W
W
w
W
W
w
w
MT
X
MF
X
SK
0
0
1
1
0
Command codes
(Note 3)
Sector ID
are compared against header on floppy
disk.
X
X
X
HD
US1
US0
C
H
R
N
prior to command
execution
The 4 bytes
EOT
GQL
DTL
Execution
Result
ST0
ST1
ST2
C
H
R
N
Data transfer between the FDD and main system
Status Information after command execution
Sector ID Information after command
execution
R
R
Read Deleted
Data
Command
W
W
W
W
W
w
W
W
W
MT
X
MF
X
SK
0
1
1
0
0
Command codes
X
X
X
HD
US,
US0
C
Sector ID rnformation
are compared
against
header on floppy disk
to command
execution
The 4 bytes
H
R
N
EOT
GPL
DTL
Execution
Result
Data transfer between the FDD and main
system
ST0
ST1
S T 2
C
H
R
N
Status
information
after command execution
Sector ID
information
after command
execution
R
RR
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
=
Dont care, usually made to equal 0.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD765AC | 制造商:NEC Electronics Corporation 功能描述:DISK CONTROLLER, 40 Pin, DIP |
| UPD765AC-2 | 制造商:NEC Electronics Corporation 功能描述:DISK CONTROLLER, 40 Pin, DIP |
| UPD76F0107GC(A)-8EU-A | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD76F0108GC(A)-UEU-AX | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD76F0108GC(A)-UEU-SSA-AX | 制造商:Renesas Electronics Corporation 功能描述: |
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