FDC37C78 datasheet(8/82 Pages) MICROCHIP

8 / 82 page

DESCRIPTION OF PIN FUNCTIONS

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

25,

Media ID0,

Media ID1

MEDIA_ID0,

MEDIA_ID1

In Floppy Enhanced Mode 2 - These bits are

the Media ID 0,1 inputs. The value of these

bits can be read as bits 6 and 7 of the Floppy

Tape Register.

Write Gate

nWGATE

OD20

This active low high current driver allows

current to flow through the write head.

becomes active just prior to writing to the

diskette.

Track 0

nTRK0

This active low Schmitt Trigger input senses

from the disk drive that the head is positioned

over the outermost track.

Index

nINDEX

This active low Schmitt Trigger input senses

from the disk drive that the head is positioned

over the beginning of a track, as marked by

an index hole.

nWrite Protected

nWRTPRT

This active low Schmitt Trigger input senses

from the disk drive that a disk is write

protected. Any write command is ignored.

nMotor On 0

nMTR0

OD20

This active low open drain output selects

motor drive 0.

nDrive Select 0

nDS0

OD20

This active low open drain output selects drive

nMotor On 1

Idle

nMTR1

IDLE

OD20

This active low open drain output select motor

drive 0.

This pin indicates that the part is in the IDLE

state and can be powered down. Whenever

the part is in this state, IDLE pin is active

high. If the part is powered down by the Auto

Powerdown Mode, IDLE pin is set high and if

the part is powered down by setting the DSR

POWERDOWN bit (direct), IDLE pin is set

low.

nDrive Select 1

Powerdown

nDS1

OD20

This active low open drain output selects drive

This pin is active high whenever the part is in

powerdown

state,

either

via

DSR

POWERDOWN bit (direct) or via the Auto

Powerdown Mode. This pin can be used to

disable an external oscillator’s output.

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