LPC47M192 datasheet(41/228 Pages) SMSC

41 / 228 page

SMSC DS – LPC47M192

Page 41

Rev. 03/30/05

DATASHEET

PS/2 Model 30 Mode

NOPREC DRATE

SEL1

DRATE

SEL0

RESET

COND.

N/A

BIT 0 and 1 DATA RATE SELECT 0 and 1

These bits determine the data rate of the floppy controller. See Table 8 for the appropriate values.

BIT 2 NO PRECOMPENSATION

This bit can be set by software, but it has no functionality. It can be read by bit 2 of the DSR when in Model 30

BIT 3 – 7 RESERVED

Should be set to a logical “0”

Table 9 shows the state of the DENSEL pin. The DENSEL pin is set high after a hardware reset and is unaffected by

the DOR and the DSR resets.

7.4.2 STATUS REGISTER ENCODING

During the Result Phase of certain commands, the Data Register contains data bytes that give the status of the

command just executed.

Table 12 – Status Register 0

BIT NO.

SYMBOL

NAME

DESCRIPTION

7,6

Interrupt Code 00 - Normal termination of command. The specified

command was properly executed and completed without

error.

01 - Abnormal termination of command.

Command

execution was started, but was not successfully

completed.

10 - Invalid command. The requested command could

not be executed.

11 - Abnormal termination caused by Polling.

Seek End

The FDC completed a Seek, Relative Seek or

Recalibrate command (used during a Sense Interrupt

Command).

Equipment

Check

The TRK0 pin failed to become a "1" after:

1. Step pulses in the Recalibrate command.

2. The Relative Seek command caused the FDC to

step outward beyond Track 0.

Unused. This bit is always "0".

Head Address The current head address.

1,0

DS1,0

Drive Select

The current selected drive.

Table 13 – Status Register 1

BIT NO.

SYMBOL

NAME

DESCRIPTION

End

Cylinder

The FDC tried to access a sector beyond the final sector

of the track (255D). Will be set if TC is not issued after

Read or Write Data command.

Unused. This bit is always "0".

Data Error

The FDC detected a CRC error in either the ID field or

the data field of a sector.

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