DP8473

更新时间： 2024-11-29 23:16:31

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
28页	358K
描述
DP8473 Floppy Disk Controller PLUS-2

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中文翻译

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数据手册

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DP8473 数据手册

July 1990

DP8473 Floppy Disk Controller PLUS-2^TM

General Description

Features

Fully mPD765A and IBM-BIOS compatible

This controller is a full featured floppy disk controller that is

software compatible with the mPD765A, but also includes

many additional hardware and software enhancements.

These enhancements include additional logic specifically re-

quired for an IBM PC, PC-XT , PC-AT , or PS/2 design.

Integrates all PCXT , PCAT , and most PS/2 Logic

Ð On chip 24 MHz Crystal Oscillator

Ð DMA enable logic

Ð IBM compatible address decode of A0–A2

Ð 12 mA mP bus interface buffers

Ð 48 mA floppy drive interface buffers

Ð Data rate and drive control registers

Precision analog data separator

This controller incorporates a precision analog data separa-

tor, that includes a self trimming delay line and VCO. Up to

three external filters are switched automatically depending

on the data rate selected. This provides optimal perform-

ance at the standard PC data rates of 250/300 kb/s, and

500 kb/s. It also enables optimum performance at 1 Mb/s

(MFM). These features combine to provide the lowest possi-

ble PLL bandwidth, with the greatest lock range, and hence

the widest window margin.

Ð Self-calibrating PLL and delay line

Ð Automatically chooses one of three filters

Ð Intelligent read algorithm

Two pin programmable precompensation modes

Other enhancements

Ð up to 1 Mb/s data rate

This controller includes write precompensation circuitry. A

shift register is used to provide a fixed 125 ns early-late

precompensation for all tracks at 500k/300k/250 kb/s (83

ns for 1 MB/s), or a precompensation value that scales with

(Continued)

Ð Implied seek up to 4000 tracks

Ð IBM or ISO formatting

Low power CMOS, with power down mode

Connection Diagrams

Plastic Leaded Chip Carrier

Dual-In-Line Package

TL/F/9384–1

Top View

Order Number DP8473V

See NS Package Number V52A

TL/F/9384–2

Top View

Order Number DP8473N

See NS Package Number N48A

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

PLUS-2^TMis a trademark of National Semiconductor Corporation.

IBMÉ, PCXTÉ, PCATÉ and PS/2É are registered trademarks of International Business Machines Corporation.

1995 National Semiconductor Corporation

TL/F/9384

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6 7...28

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