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1
I
~I
:::(6):
=~
LL
C
/E
~~C
DEVICE
FUNCTIONS
\
\
-----y
\
3
--
--
:~
3
~
~
IT
8291
Appendix D
FUNCTIONAL PARTITIONS
A
I
DEVICE (APPARATUS)
INTERFACE
FUNCTIONS
C
(8292
ONLY)
\
--
-
--
DT
\.
DC
\
\
PP
\
\
\
\
RL
\
~
MESSAGE
CODING
SR
/
/
/
L
I
-----
OR
----
-----
LE-----
I
T
/
OR
TE
I
i
AH
SH
i
I
DRIVERS
~
AND
¢0)::::
RECEIVERS
~INTERFACE
-------
-------
K~~S
L-
__
---,-
___
-IIIL-
______
--,
_______
--11
,--I
_--,--_-'
MCS'·
SYSTEM
Figure 0.1. Functional Partition Within a Device.
8291 8293
A -
CAPABILITY
DEFINED
BY
THE
488-1978
STANDARD.
B -
CAPABILITY
DEFINED
BY
THE
DESIGNER.
1 -
INTERFACE
BUS
SIGNAL
LINES.
2 -
REMOTE
INTERFACE
MESSAGES
TO
AND
FROM
INTERFACE
FUNCTIONS.
3 -
DEVICE
DEPENDENT
MESSAGES TO
AND
FROM
DEVICE
FUNCTIONS.
4 -
STATE
LINKAGES
BETWEEN
INTERFACE
FUNCTIONS.
5 - LOCAL MESSAGES BETWEEN
DEVICE
FUNCTIONS
AND
INTERFACE
FUNCTIONS
(MESSAGES
TO
INTERFACE
FUNCTIONS
ARE
DEFINED,
MESSAGES
FROM
INTERFACE
fUNCTIONS
EXIST
ACCORDING
TO
THE
DESIGNER'S
CHOICE).
6 -
CONTROL
MESSAGES
(8292
ONLY).
9-105