FDC37M607 datasheet(14/182 Pages) SMSC

14 / 182 page

PS/2 Model 30 Mode

BIT 0 nDIRECTION

Active low status indicating the direction of head

movement.

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.

INT

PENDING

DRQ

STEP

F/F

TRK0

nHDSEL

INDX

nDIR

RESET

COND.

N/A

FDC37M607 Datasheet(PDF) 14 Page - SMSC Corporation

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