LPC47M14X datasheet(38/205 Pages) SMSC

38 / 205 page

SMSC DS – LPC47M14X

Page 38

Rev. 03/19/2001

Table 14 – Status Register 1

BIT NO.

SYMBOL

NAME

DESCRIPTION

End of

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.

Overrun/

Underrun

Becomes set if the FDC does not receive CPU or DMA

service within the required time interval, resulting in data

overrun or underrun.

Unused. This bit is always "0".

No Data

Any one of the following:

1. Read Data, Read Deleted Data command - the FDC

did not find the specified sector.

2. Read ID command - the FDC cannot read the ID field

without an error.

3. Read A Track command - the FDC cannot find the

proper sector sequence.

Not Writeable WP pin became a "1" while the FDC is executing a Write

Data, Write Deleted Data, or Format A Track command.

Missing

Address Mark

Any one of the following:

1. The FDC did not detect an ID address mark at the

specified track after encountering the index pulse

from the nINDEX pin twice.

The FDC cannot detect a data address mark or a

deleted data address mark on the specified track.

Table 15 – Status Register 2

BIT NO.

SYMBOL

NAME

DESCRIPTION

Unused. This bit is always "0".

Control Mark

Any one of the following:

Read Data command - the FDC encountered a deleted

data address mark.

Read Deleted Data command - the FDC encountered a

data address mark.

Data Error in

Data Field

The FDC detected a CRC error in the data field.

Wrong

Cylinder

The track address from the sector ID field is different

from the track address maintained inside the FDC.

Unused. This bit is always "0".

Bad Cylinder

The track address from the sector ID field is different

from the track address maintained inside the FDC and is

equal to FF hex, which indicates a bad track with a hard

error according to the IBM soft-sectored format.

Missing Data

Address Mark

The FDC cannot detect a data address mark or a

deleted data address mark.

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