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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)： | 1/17頁 |
| 文件大小： | 344K |
| 代理商： | UPD765A |
NEC
NEC Electronics Inc.
uPD765A/uPD765B
S ingle/Double Density
Floppy-Disk Controller
Description
The
uPD765A/B
is an LSI floppy disk controller (FDC)
chip which contains the circuitry and control functions
for interfacing a processor to 4 floppy disk drives. It is
capableof either
IBM
3740singledensity format (FM), or
IBM System 34 double density format (MFM) including
double-sided recording. The
uPD765A/B
provides con-
trol signals which simplify the design of an external
phase-locked loop and write precompensation circuitry.
The FDC simplifies and handles most of the burdens as-
sociated with implementing a floppy disk interface.
Hand-shaking signals are provided in the
uPD765A/B
which make
DMA operation easy to
incorporate with the
aid of an external DMA controller chip, such as the
uPD8257. The
FDC will operate in eitherthe DMA or
non-
DMA mode. In the non-DMA mode the FDC generates
interrupts to !he processor every time a data byte is to
be transferred. In the DMA mode, the processor need
only load the command into the FDC and all data
transfers occur under control of the FDC and DMA
controllers.
There are
16 commands which
the
will execute. Most of these commands require multiple
8-bit bytes to fully specify the operation which the
processor wishes the FDC to perform. The following
commands are available.
Read Data
Read ID
Specify
Read Diagnostic
Scan Equal
Scan High or Equal
Scan Low or Equal
Version
Features
Address mark detection circuitry is internal to the FDC
which simplifies the phase-locked loop and read elec-
tronics. The track stepping rate, head load time, and
head
unload
time
are
uPD765A/uPD765B
offers additional features such as
multi-track and multi-side read and write commands
and single and double density capabilities.
FM, MFM Control
Variable recording length: 128,256,
.8192
bytes/
sector
IBM-compatible format (single- and
double-
sided, single- and double-density)
Multi-sector and multi-track transfer capability
Drive up to 4 floppy or micro floppydisk drives
Data scan capability-will scan a single sector or
an entire cylinder comparing byte-for-byte host
memory and disk data
Data transfers in DMA or non-DMA mode
Parallel seek operations on up to four drives
Compatible with
uPD8080/85,
and
uPD780
Single-phase clock: 8 MHz maximum
3
+5V only
Z80
uPD765A/uPD765B
Read Deleted Data
Write Data
Write ID (Format Write)
Write Deleted Data
Seek
Recalibrate
Sense Interrupt Status
Sense Drive Status.
Ordering Information
user-programmable.
The
uPD8086/88,
V-series
(Z80@)
microprocessors
is
a
registered
trademark
of the Zilog
Corporation
Pin Configuration
Device Number
uPD765AC2
uPD765B
Package
40-pin
plastic DIP
40-pin
plastic DIP
Type
Max
Freq.
of Operation
8
MHz
8
MHz
NECEL-000324
5-3
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相關代理商/技術參數(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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