FDC37C78-HT View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

FDC37C78-HT

Floppy Disk Controller

Microchip Technology 

FDD Interface Pins

All pins in the FDD interface which can be

connected directly to the floppy disk drive itself are

either DISABLED or TRISTATED. Pins

used for local logic control or part

programming are unaffected. Table 32 depicts the

state of the floppy disk drive interface pins in the

powerdown state.

Table 32 - State of Floppy Disk Drive Interface Pins in Powerdown

FDD Pins

State in Auto Powerdown

Input Pins

RDATA

Input

WP

Input

TRK0

Input

INDX

Input

DRV2

Input

DSKCHG

Input

Output Pins

MOTEN[0:3]

Tristated

DS[0:3]

Tristated

DIR

Active

STEP

Active

WRDATA

Tristated

WE

Tristated

HDSEL

Active

DENSEL

Active

DRATE[0:1]

Active

61

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