VXI VT1433B manual Trigger Lines TTLTRG, Sync/Trigger line Free-runningclock line

VT1433B 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 VT1433B 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 VT1433B modules can provide the clock signal but any of them can trigger.

VXI bus

External Sample
VXI 10 MHz Clock	Clock
24.576 MHz Clock	MUX
10 MHz Crystal Clock
External Trigger
Input Trigger
Source or Tach Trigger
96002 Trigger	Trigger
	Sync
10 MHz, Sample 0, none

Note: External Sample and External Trigger inputs are not available on VT1433B’s with a source option. The External Sample input is not available on VT1433B’s with a tachometer option.

		Sample 0
Sample 0		(word rate)
	Logic
			Sample 1
	PPL
	Oversampled		Sample 2
	Clock		Sample 3
	Generator
			Trigger
	Gate Array
			Sync

to input circuits

Figure 5-5: Clock/sync diagram

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