Datasheet > PC8477BVF-1

PC8477BVF-1

更新时间： 2024-09-19 22:16:07

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
54页	576K
描述
Advanced Floppy Disk Controller

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数据手册

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PC8477BVF-1 数据手册

August 1993

PC8477B (SuperFDC^TM)

Advanced Floppy Disk Controller

16 byte FIFO (default disabled)

Ð Burst and Non-Burst modes

Ð Programmable threshold

General Description

The PC8477B CMOS advanced floppy disk controller is an

enhanced version of National’s DP8473 floppy controller.

The PC8477B is software compatible with the DP8473 and

NEC mPD765 floppy disk controllers. In addition, it is pin and

software compatible with the Intel 82077AA floppy control-

ler. The PC8477B, a 24 MHz crystal, a device chip select,

and a resistor package are all that is needed for a complete

PC-AT , PS/2 or EISA floppy controller solution.

Perpendicular Mode Recording drive support

High performance internal analog data separator (no

external filter components required)

Low power CMOS with manual power down mode

Automatic power down mode, for complete software

transparency

Integrates all PC-AT, and PS/2 logic

Ð On chip Oscillator

Ð PC compatible FDC address decode

Ð PS/2 Model 30 and Model 50/60/80 diagnostic

registers

The PC8477B includes advanced features such as

16 byte FIFO (Burst and Non-Burst modes), support of Per-

pendicular Recording Mode disk drives, PS/2 diagnostic

registers for Model 30 and Models 50/60/80, standard

CMOS disk I/O, and additional commands to control these

new features. The 16 byte FIFO will increase system per-

formance at higher data rates and with multi-tasking bus

structures. This controller is designed to fit into all PC-AT,

EISA, and PS/2 designs, as well as other advanced applica-

tions.

Ð DMA control circuitry

Ð High current CMOS disk interface outputs

Ð Data Rate and Digital Output registers

Ð 12 mA mP bus interface buffers

Data Rate Support: 250/300 kb/s, 500 kb/s,

and 1 Mb/s

Write precompensation software programmable

68 pin PLCC package

Features

Pin and software compatible with Intel 82077AA FDC

60 pin PQFP package

Ideal for space limited applications

Software compatible with NSC’s DP8473

Functional Block Diagram

TL/F/11332–3

FIGURE 1-1

SuperFDC^TMis a trademark of National Semiconductor Corporation.

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

IBMÉ, PC-ATÉ and PS/2É are registered trademarks of International Business Machines Corp.

1995 National Semiconductor Corporation

TL/F/11332

RRD-B30M75/Printed in U. S. A.

12 3 4 5 6 7...54

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