FDC37N972 datasheet(32/390 Pages) SMSC

No. de pieza	FDC37N972

Descripción Electrónicos	Advanced Notebook I/O Controller with Enhanced Keyboard Control and System Management

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Fabricante Electrónico	SMSC [SMSC Corporation]

Página de inicio	http://www.smsc.com

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TABLE 11 - SRA - PS/2 MODEL 30 MODE

7

6

5

4

3

2

1

0

INT

PENDING

DRQ

STEP

F/F

TRK0

NHDSE

L

INDX

WP

nDIR

RESET

COND.

0

N/A

1

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 FDC’s DRQ output pin.

BIT 7 INTERRUPT PENDING

Active high bit indicating the state of the Floppy Disk Interrupt output.

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