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Trigger Lines (TTLTRG)
TTLTRG consist of eight TTL lines on the VXI backplane on connector P2.
They are available to provide synchronization between devices. VXI devices
can use the TTLTRG lines for simple communication with other devices.
For example, a device can wait for a line to go high before taking an action,
or it can assert a line as a signal to another device.
The HP E1432A uses two trigger lines. These can be placed on any two of
the eight TTLTRG lines available on the VXI backplane. The lines are:
q Sync/Trigger line
q Free-running clock line
When programmed in a multiple-module configuration, only one of the HP
E1432A modules can provide the clock signal but any of them can trigger.
10 MHz Crystal Clock
Clock
MUX
VXI 10 MHz Clock
24.576 MHz Clock
External Sample
External Trigger
Input Trigger
Source or Tach Trigger
96002 Trigger
10 MHz, Sample 0, none
Sync
Sync
Note: External Sample and External Trigger
inputs are not available on HP E1432A's with
a source option. The External Sample input
is not available on HP E1432A's with a
tachometer option.
Trigger
Trigger
Gate Array
VXI bus
Sample 1
Sample 2
Sample 3
to in
p
ut circuits
Sample 0
(word rate)
PLL
Clock
Oversampled
Generator
Sample 0
Logic
Figure 5-11: Clock/sync diagram
HP E1432A User's Guide
Module Description
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