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pon--_--I
"'IDY = ATN .
EOI
F!gure A,1, 8291 State D!agrams
Time Value
8291
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PP2
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Appendix B
IEEE 488 TIME VALUES
Identifier'
Function (Applies to)
Description
T1
SH
Settling Time
for
Multiline Messages
t2
LC,iC,SH,AH,T,L Response to ATN
T3
AH
Interface Message Accept Time t
t4
T,TE,L,LE,C,CE
Response
to
IFC
or
REN
False
t5
PP
Response
to
ATN+EOI
T6
C Parallel Poll Execution Time
T7
C Controller Delay to
Allow
Current Talker
to
see ATN Message
T8
C Length
of
IFC
or
REN
False
T9
C Delay
for
EOI"
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Value
<::
21'st
::;
200ns
>
06
<
1001's
::;
200ns
<::
21's
<::
500ns
>
1001's
<::
1.5l'stt
• Time values specified by a lower case t indicate the maximum time allowed
to
make a state transition. Time values specified by
an
upper case T indicate the minimum time that a function must remain
in
a state before exiting.
If three-state drivers are used on the 010, DAV, and
EOI
lines,
T1
may
be:
1.
2:
1100ns
2.
Or
2:
700ns
if
it is known that within the controller ATN is driven by a three-state driver.
3.
Or
2:
500ns for
'all
subsequent bytes following the first sent after each false transition of ATN (the first byte must be sent in
accordance
with, (1)
or
(2).
4.
Or
2:
350ns for all subsequent bytes following the first sent 'after each false transition of ATN under conditions specified
in
Section 5.2.3 and warning note.
See
IEEE Standard
488.
t Time required for interface functions
to
accept, not necessarily respond
to
interface messages.
{j Implementation independent.
••
Delay required for EOI, NDAC, and NRFD signal lines
to
indic,ate valid slates.
tt
2:
600ns for three-state drivers.
9-102