FDC37M607 datasheet(30/182 Pages) SMSC

30 / 182 page

Table 16 - 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:

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 Writable

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 IDX pin twice.

The FDC cannot detect a data address mark or a

deleted data address mark on the specified track.

FDC37M607 Datasheet(PDF) 30 Page - SMSC Corporation