FDC37C669TQFP View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37C669TQFP

PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support

SMSC -> Microchip 

FLOPPY DISK CONTROLLER

FLOPPY DISK CONTROLLER INTERNAL REGISTERS

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 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.

The FDC37C669 is compatible to the 82077AA

using SMSC's proprietary floppy disk controller core.

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.

18

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