HP E1432A User's Guide

Module Description

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:

￿Sync/Trigger line￿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.

VXI busExternal SampleVXI 10 MHz Clock Clock24.576 MHz Clock MUX10 MHz Crystal Clock

External Trigger

 

 

 

 

 

 

 

 

 

 

Input Trigger

 

 

 

 

 

 

 

Source or Tach Trigger

 

 

Trigger

 

 

 

 

 

 

 

96002 Trigger

 

 

 

 

Sync

 

 

 

 

 

 

 

 

10 MHz, Sample 0, none

 

 

 

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

Sample 0

 

 

Sample 0

 

(word rate)

 

 

Logic

 

 

 

 

 

 

 

 

 

 

 

Sample 1

 

 

 

 

 

 

 

 

 

 

 

 

 

PLL

 

 

 

 

 

 

 

 

 

 

 

 

 

Oversampled

Sample 2

 

 

 

 

 

 

 

 

 

 

Clock

 

Sample 3

 

 

 

 

 

Generator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trigger

 

 

 

 

 

 

 

 

 

 

 

 

 

Gate Array

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sync

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to input circuits
Figure 5-11: Clock/sync diagram

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