LPC47M192 datasheet(33/228 Pages) SMSC

33 / 228 page

SMSC DS – LPC47M192

Page 33

Rev. 03/30/05

DATASHEET

BIT 0 MOTOR ENABLE 0

Active high status of the MTR0 disk interface output pin. This bit is low after a hardware reset and unaffected by a

software reset.

BIT 1 MOTOR ENABLE 1

Active high status of the MTR1 disk interface output pin. This bit is low after a hardware reset and unaffected by a

software reset.

BIT 2 WRITE GATE

Active high status of the WGATE disk interface output.

BIT 3 READ DATA TOGGLE

Every inactive edge of the RDATA input causes this bit to change state.

BIT 4 WRITE DATA TOGGLE

Every inactive edge of the WDATA input causes this bit to change state.

BIT 5 DRIVE SELECT 0

Reflects the status of the Drive Select 0 bit of the DOR (address 3F2 bit 0). This bit is cleared after a hardware reset

and it is unaffected by a software reset.

BIT 6 RESERVED

Always read as a logic “1”.

BIT 7 RESERVED

Always read as a logic “1”.

PS/2 Model 30 Mode

BIT 0 nDRIVE SELECT 2

The DS2 disk interface is not supported.

BIT 1 nDRIVE SELECT 3

The DS3 disk interface is not supported.

BIT 2 WRITE GATE

Active high status of the latched WGATE output signal. This bit is latched by the active going edge of WGATE and is

cleared by the read of the DIR register.

BIT 3 READ DATA

Active high status of the latched RDATA output signal. This bit is latched by the inactive going edge of RDATA and is

cleared by the read of the DIR register.

BIT 4 WRITE DATA

Active high status of the latched WDATA output signal. This bit is latched by the inactive going edge of WDATA and

is cleared by the read of the DIR register. This bit is not gated with WGATE.

BIT 5 nDRIVE SELECT 0

Active low status of the DS0 disk interface output.

BIT 6 nDRIVE SELECT 1

Active low status of the DS1 disk interface output.

nDRV2

nDS1

nDS0

WDATA

F/F

RDATA

F/F

WGATE

F/F

nDS3

nDS2

RESET

COND.

N/A

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