LPC47M14X datasheet(37/205 Pages) SMSC

37 / 205 page

SMSC DS – LPC47M14X

Page 37

Rev. 03/19/2001

BIT 2 - 7 RESERVED

Should be set to a logical "0"

PS/2 Model 30 Mode

BIT 0 and 1 DATA RATE SELECT 0 and 1

These bits determine the data rate of the floppy controller. See Table 9 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 register

mode. Unaffected by software reset.

BIT 3 - 7 RESERVED

Should be set to a logical "0"

Table 10 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.

6.5.2

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 13 – 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. 80 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.

NOPREC DRATE

SEL1

DRATE

SEL0

RESET

COND.

N/A

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