FD1771-01

WESTERN DIGITAL COR PO RAT /0 N FD1771-01 Floppy Disk Formatter/Controller FEATURES SOFT SECTOR FORMAT COMPATIBILITY AUTOMATIC TRACK SEEK WITH VERIFICATION READ MODE Single/Multiple Sector Write with Automatic Sector Search or Entire Track Read Selectable 128 Byte or Variable Length Sector WRITE MODE Single/Multiple Sector Write with Automatic Sector Search Entire Track Write for Diskette Formatting 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 SYSTEM COMPATIBILITY i Double Buffering of Data a-Bit Bi-Directional .... Bus for Data. Control and Status DMA or Programmed Data Transfers All Inputs and Outputs are TTL Compatible .,uzi ;:) APPLICATIONS FLOPPY DISK DRIVE INTERFACE SINGLE OR MULTIPLE DRIVE CONTROLLER/FORMATTER NEW MINI-FLOPPY CONTROLLER GENERAL DESCRIPTION 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 Vee (-5VI WE Cs RE AO A, ··DAlO DAll DAL2 5AL3 DAU DALS r>AI1. DAL 7 i>Hi'STEP !'R2/DIRC PH3 ~ MR WPRT iP WD WG TG.3 HLD K COMPUTER INTERFACE )DATA 181 AO Al ~ RE W£ MR 'SV 1 10K 10K FDDATA ~DClOCK FLOPPY DISK CONTROLLER, FORMATTER xrns 'SV --~ WD WG WPRT wr FDI771 il' moo- READY TG 48 pHj'STEP ORO INTRO ClK 12MHZI f5H2/DIRC PH3 3m --...