FDC37C78-HT View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

FDC37C78-HT

Floppy Disk Controller

Microchip Technology 

BIT NO.

7

6

5

4

3

2

1

0

* D= Decimal

SYMBOL

EN

DE

OR

ND

NW

MA

Table 15 - Status Register 1

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 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.

2.

The FDC cannot detect a data address mark

or a deleted data address mark on the

specified track.

23

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