FDC37M81 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37M81

PC98/99 Compliant Enhanced Super I/O Controller with Keyboard/Mouse Wake-Up

SMSC -> Microchip 

PS/2 Model 30 Mode

7

6

5

4

3

2

1

0

INT

DRQ STEP TRK0 nHDSEL INDX WP nDIR

PENDING

F/F

RESET

0

COND.

0

0

N/A

1

N/A N/A

1

BIT 0 nDIRECTION

Active low status indicating the direction of head

movement. A logic "0" indicates inward

direction; a logic "1" indicates outward direction.

BIT 1 WRITE PROTECT

Active high status of the WRITE PROTECT disk

interface input. A logic "1" indicates that the disk

is write protected.

BIT 2 INDEX

Active high status of the INDEX disk interface

input.

BIT 3 nHEAD SELECT

Active low status of the HDSEL disk interface

input. A logic "0" selects side 1 and a logic "1"

selects side 0.

BIT 4 TRACK 0

Active high status of the TRK0 disk interface

input.

BIT 5 STEP

Active high status of the latched STEP disk

interface output pin. This bit is latched with the

STEP output going active, and is cleared with a

read from the DIR register, or with a hardware

or software reset.

BIT 6 DMA REQUEST

Active high status of the DRQ output pin.

BIT 7 INTERRUPT PENDING

Active high bit indicating the state of the Floppy

Disk Interrupt output.

17

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