FDC37C78-HT datasheet(22/82 Pages) 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 14 - 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

Seek,

Relative

Seek

Recalibrate command (used during a Sense Interrupt

Command).

Equipment

Check

The TRK0 pin failed to become a "1" after:

80 step pulses in the Recalibrate command.

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.

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