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FDC37C669FR

Super I/O Floppy Disk Controller with Fast Infrared Support

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 FDC37C669FR is compatible to the

82077AA using SMSC's proprietary floppy disk

controller core.

FLOPPY DISK CONTROLLER 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

FDC description assumes the Base I/O Address

is 3F0.

Table 2 - Status, Data and Control Registers

BASE I/O

ADDRESS

REGISTER

+0

R Status Register A

+1

R Status Register B

+2

R/W Digital Output Register

+3

R/W Tape Drive Register

+4

R Main Status Register

+4

W Data Rate Select Register

+5

R/W Data (FIFO)

+6

Reserved

+7

R Digital Input Register

+7

W Configuration Control Register

SRA

SRB

DOR

TSR

MSR

DSR

FIFO

DIR

CCR

For information on the floppy disk on Parallel Port pins, refer to Configuration Register CR4 and

Parallel Port Floppy Disk Controller description.

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