UPD765B

更新时间： 2024-01-27 18:51:26

品牌	Logo	应用领域
日电电子 - NEC		存储微控制器和处理器次级存储控制器外围集成电路光电二极管
页数	文件大小	规格书
17页	334K
描述
Single/Double Density Floppy-Disk Controller

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中文翻译

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技术参数
数据手册

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UPD765B 技术参数

生命周期：	Obsolete	包装说明：	0.600 INCH, PLASTIC, DIP-40
Reach Compliance Code：	unknown	风险等级：	5.83
Is Samacsys：	N	外部数据总线宽度：	8
JESD-30 代码：	R-PDIP-T40	端子数量：	40
最高工作温度：	70 °C	最低工作温度：	-10 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装形状：	RECTANGULAR	封装形式：	IN-LINE
认证状态：	Not Qualified	最大压摆率：	140 mA
最大供电电压：	5.5 V	最小供电电压：	4.5 V
标称供电电压：	5 V	表面贴装：	NO
技术：	MOS	温度等级：	COMMERCIAL
端子形式：	THROUGH-HOLE	端子位置：	DUAL
uPs/uCs/外围集成电路类型：	SECONDARY STORAGE CONTROLLER, FLOPPY DISK DRIVE	Base Number Matches：	1

UPD765B 数据手册

uPD765A/uPD765B

Single/Double Density

Floppy-Disk Controller

NEC

NEC Electronics Inc.

Description

Features

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.

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 user-programmable. The

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

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

IBM-compatible format (single- and double-

sided, single- and double-density)

uPD8257. The

FDC will operate in eitherthe DMA or non-

Multi-sector and multi-track transfer capability

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.

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

There are 16 commands which the uPD765A/uPD765B

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.

Compatible with uPD8080/85,

uPD8086/88,

V-series

and uPD780 (Z80@) microprocessors

Single-phase clock: 8 MHz maximum

+5V only

Z80

R e a d D a t a

R e a d D e l e t e d D a t a

Write Data

Write ID (Format Write)

Write Deleted Data

Seek

Recalibrate

Sense Interrupt Status

Sense Drive Status.

registered

trademark

of the Zilog

Corporation

R e a d I D

Specify

Read Diagnostic

S c a n E q u a l

Scan High or Equal

S c a n L o w o r E q u a l

Version

Pin Configuration

Ordering Information

D e v i c e N u m b e r

Package Type

Max Freq. of Operation

uPD765AC2

40-pin plastic DIP

MHz

uPD765B

40-pin plastic DIP

MHz

NECEL-000324

5-3

12 3 4 5 6 7...17

中文翻译

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与UPD765B相关器件

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UPD76F0018	RENESAS	获取价格	RISC MICROCONTROLLER, PQFP144, 20 X 20 MM, 0.50 MM PITCH, PLASTIC, LQFP-144
UPD76F0018GJ-UEN	NEC	获取价格	RISC Microcontroller, 32-Bit, FLASH, 20MHz, CMOS, PQFP144, 0.50 MM PITCH, LQFP-144
UPD77015	NEC	获取价格	16 bits, Fixed-point Digital Signal Processor
UPD77015GC	NEC	获取价格	16 bits, Fixed-point Digital Signal Processor
UPD77015GC-9EU	ETC	获取价格	16-Bit Digital Signal Processor
UPD77016	NEC	获取价格	16 bits, Fixed-point Digital Signal Processor
UPD77016GF-20	RENESAS	获取价格	IC,DSP,16-BIT,CMOS,QFP,160PIN,PLASTIC
UPD77016GM-KMD	NEC	获取价格	16 bits, Fixed-point Digital Signal Processor
UPD77017	NEC	获取价格	16 bits, Fixed-point Digital Signal Processor
UPD77017GC	NEC	获取价格	16 bits, Fixed-point Digital Signal Processor

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