FDC37N869 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

MFG CO.

FDC37N869

5V and 3.3V Super I/O Controller with Infrared Support for Portable Applications

SMSC -> Microchip 

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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 28 - Status Register 0

BIT

NO. SYMBOL NAME

DESCRIPTION

7,6 IC

Interrupt 00 - Normal termination of command. The specified command was

Code

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.

5 SE

Seek End The FDC completed a Seek, Relative Seek or Recalibrate command

(used during a Sense Interrupt Command).

4 EC

Equipment The TRK0 pin failed to become a “1” after:

Check

1. 80 step pulses in the Recalibrate command.

2. The Relative Seek command caused the FDC to step outward beyond

Track 0.

3

Unused. This bit is always “0”.

2H

Head

The current head address.

Address

1,0 DS1,0 Drive

The current selected drive.

Select

Table 29 - Status Register 1

BIT

NO. SYMBOL NAME

DESCRIPTION

7 EN

End of

The FDC tried to access a sector beyond the final sector of the track

Cylinder (255D). Will be set if TC is not issued after Read or Write Data command.

6

Unused. This bit is always “0”.

5 DE

Data Error The FDC detected a CRC error in either the ID field or the data field of a

sector.

4 OR

Overrun/ Becomes set if the FDC does not receive CPU or DMA service within the

Underrun required time interval, resulting in data overrun or underrun.

3

Unused. This bit is always “0”.

2 ND

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.

1 NW

Not

WP pin became a “1” while the FDC is executing a Write Data, Write

Writable Deleted Data, or Format A Track command.

0 MA

Missing Any one of the following:

Address 1. The FDC did not detect an ID address mark at the specified track after

Mark

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.

SMSC DS – FDC37N869

Page 32

Rev. 11/09/2000

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