ACT apricot - Page 117

FLOPPY DISK INTERFACE
1 s71 s61 S51 s41 S31 s21 Sl I so 1 Status Register
Busy
DRQ
Lost
Data
CRC
Error
I L Busy
~DRQ
~L
ost Data
CRC E rror
RNF
Logic 0
Protected
Not Read
y
A logic high on Busy indicates that the
command is in progress; logic low indicates
that the command sequence is complete.
A copy of
the DRQ output to the lOP. A logic
high indicates that the FDC has data available
during a read operation, and requires data
during a write operation.
Logic
high indicates that the lOP did not
respond to the DRQ output in time, and as a
result; valid
data was not written onto the disk
during a write operation, valid data was not
read from the disk during a read operation.
During the write operation, a logic high
indicates a CRC error was detected within one
or
more sector ID fields. During the read
operation, a logic
high indicates a CRC error
was detected either within one or more ID
fields,
or a CRC error detected at the end of a
data field.
continued ....