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82077AA-1

CHMOS SINGLE-CHIP FLOPPY DISK CONTROLLER

Intel 

82077AA

1 0 INTRODUCTION

The 82077AA is a true single-chip floppy disk and

tape drive controller for the PC-AT and PS 2 The

82077AA a 24 MHz crystal a resistor package and

a chip select implement a complete design All drive

control signals are fully decoded and have 40 mA

drive buffers with selectable polarity Signals re-

turned from the drive are sent through on-chip input

buffers with hysteresis for noise immunity The inte-

grated analog data separator needs no external

compensation yet allows for a wide motor speed

variation with exceptionally low soft error rates The

microprocessor interface has a 12 mA drive buffer

on the data bus plus 100% hardware register com-

patibility for PC-AT’s and PS 2’s The 16-byte FIFO

with programmable thresholds is extremely useful in

multi-master systems (PS 2 EISA) or systems with

a large amount of bus latency

Upon reset (Pin 32) the 82077AA defaults to 8272A

functionality New features are either selected via

hardware straps or new commands Figure 1-1 is a

block diagram of the 82077AA

Figure 1-1 82077AA Block Diagram

290166 – 2

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