HP 8-Channel 196 kSa/sec Digitizer plus DSP E1433A manual Trigger Lines Ttltrg, Clock, Sync

HP E1433A 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 E1433A 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 E1433A modules can provide the clock signal but any of them can trigger.

VXI bus

External Sample		Clock
VXI 10	MHz Clock
24.576	MHz Clock	MUX
10 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 E1433A's with a source option. The External Sample input is not available on HP E1433A'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 5-10: Clock/sync diagram

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