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Principles of Operation
INTERACTIVE COMMAND COMPLETION. This response is given when the LANIC completes the
execution of an interactive command. The command-specific bits of the response code contain status and
error codes whose meanings depend on the associated command as shown below.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
0
0
Completion status
Command code
I
I
I
I
I
I
I
I
I
I
I
02 -
03
04
08
09
OA -
OB -
Command code
Completion status
=
Command code originally given
=
See below and paragraph "Se lf-test"
00 - command executed correctly
01
sync between driver and LANIC established
(e.g., an all-ones word written into CR)
illegal length command
command not found
command doesn't match length
host buffer crosses bank boundary
non-word address on download or dump
checksum didn't check (DOWNLOAD command)
illegal start address (START CODE command)
INTERACTIVE COMMAND ACKNOWLEDGEMENT. This response is given after the firmware reads
the first word of a multiple-word command from the CR. This response is useful for avoiding the host
software busy-wait on CRFULL after the first word of a multiple-word command has been written to
the DR. This problem is due to the fact that the first word may not be accepted by the LANIC for
several milliseconds, but the succeeding words are handshaken with negligible delay.
A command
acknowledgement response is not given for a single-word command as it is followed by a command
completion response anyway. See below.
0
1
2
3
4
t-
6
7
8
9
10
11
12
13
14
15
::>
0
0
1
Undefined
I
I
I
I
I
I
I
I
I
I
I
I
11/85
3-7
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