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FDC37C78

Floppy Disk Controller

SMSC -> Microchip 

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.

BIT NO.

7,6

5

4

3

2

1,0

SYMBOL

IC

SE

EC

H

DS1,0

Table 14 - Status Register 0

NAME

DESCRIPTION

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 a Seek, Relative Seek or

Recalibrate command (used during a Sense Interrupt

Command).

Equipment

Check

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

1. 80 step pulses in the Recalibrate command.

2. 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.

Drive Select The current selected drive.

22

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