FD1771 Datasheet (Western Digital) - FLOPPY DISK FORMATTER/CONTROLlER

FD1771, FLOPPY DISK FORMATTER/CONTROLlER

1.1 FD1771 - Flexible Drive Interface (Refer to Figure 1-1 FD1771 Block Diagram) The FD1771 hand les si ngle density frequency modulated The F01771 generates all controls to position the read/ (FM) data.

Each data cell is defined by clock pulses.

A pulse write head over the desired track.

The F

WESTERN DIGITAl MOS/LSI FD1771 APPLICATION NOTE FLOPPY DISK CONTROLLER APPLICATION NOTE Introduction The FD 1771 is a MOS/LSI device that performs the function of interfacing a processor to a' flexible (Floppy) diskette drive.

This single chip replaces nearly 80% of the required disk drive interface electronics.

(See figure 1-1) .It provides tha data accessing controls and the bidirectional transfer of information between the processor's memory and the magnetically stored data on the diskette.

FD1771 Features

* tiple sector and variable sector length. All received words in the Data register are transferred to the shift regist