FDC37C93X データシートの表示（PDF） - SMSC -> Microchip

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FDC37C93X

Plug and Play Compatible Ultra I/O™ Controller

SMSC -> Microchip 

FLOPPY DISK CONTROLLER

The Floppy Disk Controller (FDC) provides the

interface between a host microprocessor and

the floppy disk drives. The FDC integrates the

functions of the Formatter/Controller, Digital

Data Separator, Write Precompensation and

Data Rate Selection logic for an IBM XT/AT

compatible FDC. The true CMOS 765B core

guarantees 100% IBM PC XT/AT compatibility

in addition to providing data overflow and

underflow protection.

The FDC is compatible to the 82077AA using

SMSC's proprietary floppy disk controller core.

FDC INTERNAL REGISTERS

The Floppy Disk Controller contains eight

internal registers which facilitate the interfacing

between the host microprocessor and the disk

drive. Table 2 shows the addresses required to

access these registers. Registers other than the

ones shown are not supported. The rest of the

description assumes that the primary addresses

have been selected.

PRIMARY

ADDRESS

3F0

3F1

3F2

3F3

3F4

3F4

3F5

3F6

3F7

3F7

Table 2 - Status, Data and Control Registers

(Shown with base addresses of 3F0 and 370)

SECONDARY

ADDRESS

REGISTER

370

R

Status Register A

371

R

Status Register B

372

R/W Digital Output Register

373

R/W Tape Drive Register

374

R

Main Status Register

374

W Data Rate Select Register

375

R/W Data (FIFO)

376

Reserved

377

R

Digital Input Register

377

W Configuration Control Register

SRA

SRB

DOR

TSR

MSR

DSR

FIFO

DIR

CCR

12

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