Vmetro VBAT-PB, User Manual

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3 Functional description
lime S a m p ing registers
Clock Clock
Tag generation
, generation
Trigger 4 E _
Output
Trigger
• Sequencer
4 x Word Recognizers
Trigger
Sequencer
- - >
Twin mode
Wide mode
Ext.
inputs
The two analyzer parts of the VBT-325 can be operated in "twin mode" or
"wide mode", defined by jumper settings. In twin mode, as shown in the figure
above, the two analyzers operate independently, with separate acquisition paths,
word recognizers, trigger sequencer, time tags, statistics counters and trace
memory. This allows independent and simultaneous analysis of the VMEbus
and the P2 bus. Cross-triggering between the two analyzers is possible both
ways by means of a dedicated trace channel bit which is hardwired directly
from the trigger output of the other analyzer part.
For use in applications that require one wide analyzer, the two analyzer parts
can be configured with jumper settings to operate as one wide analyzer with as
many as 177 input channels. Together with a provision for externally generated
sampling clocks (taken through a connector located between the P1 and P2
connectors), this gives flexibility to use the VBT-325 for other busses than
VME/P2. As an example, the FBA-625 Fu Adapter transforms the
VBT-325 into a complete, standalone Fu Bus Analyzer (the FBT-625).
P1 & P2 (177 ch.)
40-pins
Adapter
Connector
4e
VS13SCSI UserP2
Trace Buffer (192x32K)
Terminal
Host /
Printer
Statistics
counters Statistics
counters
AN
V
Figure 12. VBT-325 Block Diagram, shown in "Wide mode". (As used when configured as a
Fu Analyzer together with the FBA-625 Fu Adapter.)
Sampling stage
The sampling stage contains sampling registers and clock generation circuitry
that provides synchronous or asynchronous sampling of the target bus.
24 V B T - 3 2 5 User's Manual V M E T R O