LPC47M112 datasheet(27/208 Pages) SMSC

27 / 208 page

Enhanced Super I/O Controller with LPC Interface

Datasheet

SMSC DS – LPC47M112

Page 27

Rev. 02/02/2005

DATASHEET

BIT 2 nINDEX

Active low status of the INDEX disk interface input.

BIT 3 HEAD SELECT

Active high status of the HDSEL disk interface input. A logic "1" selects side 1 and a logic "0" selects side 0.

BIT 4 nTRACK 0

Active low status of the TRK0 disk interface input.

BIT 5 STEP

Active high status of the STEP output disk interface output pin.

BIT 6 nDRV2

This function is not supported. This bit is always read as “1”.

BIT 7 INTERRUPT PENDING

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

PS/2 Model 30 Mode

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 DMA request pending.

BIT 7 INTERRUPT PENDING

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

INT

PENDING

DRQ

STEP

F/F

TRK0 nHDSEL INDX

nDIR

RESET

COND.

N/A

LPC47M112 Datasheet(PDF) 27 Page - SMSC Corporation

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