The FD1771 is a MOS/LSI device that performs the functions of a Floppy Disk Controller / Formatter.

The de­vice is designed to be included in the disk drive electronics, and contains a flexible interface organization that accomodates the interface signals from most drive manufactures. The FD1771 is compatible with the IBM 3740 data entry system format.

The processor interface consists of a 8-bit bidi­rectional bus for data, status, and control word transfers. The FD1771 is set up to operate on a multiplexed bus with other bus-oriented devices.

The FD1771 is fabricated in N-channel Sil1con Gate MOS technology and is TTL compatible on ali inputs and outputs .

APPLICATIONS

o FLOPPY DISK DRIVE INTERFACE

o SINGLE OR MULTIPLE DRIVE CONTROLLER / FORMATTER

o NEW MINI-FLOPPY CONTROLLER

Features

o SOFT SECTOR FORMAT COMPATIBILITY

o AUTOMATI C TRACK  SEEK  WITH  VERIFICATION

o READ MODE

Single / Multiple Record Read with Automatic Sector Search or Entire Track Read

Selectable 128 Byte or Variable Length Record

o WRITE MODE

Single/ Multiple    Record   Write   wit h   Automatic Sector Search

Entire Track Write tor Diskette lnitialization

o PROGRAMMABLE  CONTROLS

Selectable Track to Track Stepping Time Selectable Head Settling and Head Engage Times

Selectable Three Phase or Step and Direction and Head Positioning Motor Controls

o SYSTEM COMPATIBILITY

Double Buffering of Data 8 Bit Bi-Directional Bus tor

Data, Control and status

DMA or Programmed Data Transfers

All lnputs and Outputs are TTL Compatible

o No - 5VDC Power Supply Required on - 11 version