FDC37N869TQFP View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37N869TQFP

5V and 3.3V Super I/O Controller with Infrared Support for Portable Applications

SMSC -> Microchip 

FUNCTIONAL DESCRIPTION

Super I/O Registers

Table 3 shows the addresses of the various device blocks of the Super I/O immediately after power up. The base

addresses must be set in the configuration registers before accessing these devices. The base addresses of the

FDC, Serial and Parallel Ports can be moved via the configuration registers.

Host Processor Interface

The host processor communicates with the FDC37N869 using the Super I/O registers. Register access is

accomplished through programmed I/O or DMA transfers. All registers are 8 bits wide. All host interface output

buffers are capable of sinking a minimum of 12 mA.

ADDRESS

3F0, 3F1 or 370, 371

Base +[0:7]

Base +[0:7]

Base1 +[0:7]

Base2 +[0:7]

Base +[0:3] all modes

Base +[4:7] for EPP

Base +[400:403] for ECP

Table 3 - FDC37N869 Block Addresses

BLOCK NAME

NOTES

Configuration

Write only; Note 1

Floppy Disk

Disabled at power up; Note 2

Serial Port Com 1 Disabled at power up; Note 2

Serial Port Com 2 Disabled at power up; Note 2

Parallel Port

Disabled at power up; Note 2

Note 1: Configuration registers can only be modified in the configuration state, refer to section CONFIGURATION

on page 101 for more information. All logical blocks in the FDC37N869 can operate normally in the Configuration

State.

Note 2: The base addresses must be set in the configuration registers before accessing the logical device

blocks.

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 FDC37N869 is compatible with the 82077AA using SMSC’s proprietary floppy disk controller core. For

information about the floppy disk on the Parallel Port pins refer to section Parallel Port Floppy Disk Controller on

page 57.

Modes Of Operation

The FDC37N869 Floppy Disk Controller has two Floppy modes and three Interface modes. Each of the three

Interface modes are available in each of the two Floppy modes.

Floppy Modes

The Floppy modes are used to select alternate configurations for the Tape Drive register. The active Floppy mode

is determined by the Enhanced Floppy Mode 2 bit in Configuration Register 3 (see section CR03 on page 106).

When the Enhanced Floppy Mode 2 bit is 0 Normal Floppy mode is selected, otherwise Enhanced Floppy Mode 2

(OS/2 mode) is selected. See section TAPE DRIVE REGISTER (TDR) on page 24 for the affects of the Enhanced

Floppy Mode 2 bit on the Tape Drive register.

SMSC DS – FDC37N869

Page 17

Rev. 11/09/2000

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