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Managing Multiple-mainframe Measurements
In a single mainframe measurement, the VT1433B communicates with other
VT1433Bs through the TTLTRG lines. However, when using the VXI-MXI bus
extender modules, the TTLTRG lines, which carry the group synchronization
pulse and sample clock, are extended only in one direction. This unidirectional
signal connection restricts the types of measurements that can be made in a
multiple mainframe environment.
The following types of multiple mainframe measurements cannot be performed:
q
Unequal pre-trigger delay settings between mainframes
q
Channel triggering by channels in Mainframe B
q
Lower spans or longer blocksizes in Mainframe B
q
Different digital filter settling times between VT1433B modules
VT1433B User's Guide
The Host Interface Library
4-14
S
l
o
t
0
MXI-2
Extender
Interface
E
t
h
ernetor
Fi
rew
i
re
EmbeddedController
VT1433B
VT1433B
VXI MainframeA
VXI Mainframe B
MXI-2Extender Interface
bus bus
Fail
Cal
Acs Trigger FailAcs Trigger
ExSamp
8-CHANNEL196
kSa/sDIGITIZER
+DSP
Chan
5-8
Chan
5-8
ExTrig CalExSamp ExTrig
8-CHANNEL196
kSa/sDIGITIZER
+DSP
Chan
1-4
Chan
1-4
bus bus
Fail
Cal
Acs Trigger FailAcs Trigger
ExSamp
8-CHANNEL196
kSa/sDIGITIZER
+DSP
Chan
5-8
Chan
5-8
ExTrig CalExSamp ExTrig
8-CHANNEL196
kSa/sDIGITIZER
+DSP
Chan
1-4
Chan
1-4
VT1433B VT1433B
VT1433B VT1433B
MXI-2
ExtenderInterface
VT1433B
VT1433B
VXI MainframeA
VXI Mainframe B
MXI-2Extender Interface
bus bus
Fail
Cal
Acs Trigger FailAcs Trigger
ExSamp
8-CHANNEL196
kSa/sDIGITIZER
+DSP
Chan
5-8
Chan
5-8
ExTrig CalExSamp ExTrig
8-CHANNEL196
kSa/sDIGITIZER
+DSP
Chan
1-4
Chan
1-4
bus bus
Fail
Cal
Acs Trigger FailAcs Trigger
ExSamp
8-CHANNEL196
kSa/sDIGITIZER
+DSP
Chan
5-8
Chan
5-8
ExTrig CalExSamp ExTrig
8-CHANNEL196
kSa/sDIGITIZER
+DSP
Chan
1-4
Chan
1-4
VT1433B VT1433B
VT1433B VT1433B
Example 1: Slot 0 Controller Example 2: MXI-2 Dais
y
Chain
Figure 4-1: Multiple mainframes - two mainframes