Choosing The Type Of Routing - National Instruments PXIe-6674 User Manual

Pxi express timing and synchronization module

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Table Of Contents

Table of Contents

You can independently select the output signal source for the PXI star trigger line from one of

the following sources:

•

PFI<0..5>

•

PFI_LVDS<0..2>

•

PXI_TRIG<0..7>

•

Global software trigger

•

Backplane synchronization clock

•

PXIe_DSTARB

•

Steady logic high or low

Refer to the

Using the PXI Triggers

synchronization clock.

Using the PXIe_DSTARB and PXIe_DSTARC Triggers

To improve beyond the performance the PXI Star triggers offer in low skew trigger routing,

PXI Express implements PXIe_DSTARB and PXIe_DSTARC triggers. Each PXI Express

peripheral slot in a PXI Express chassis has independent PXIe_DSTARB and PXIe_DSTARC

connections with the system timing slot module. This allows peripheral modules to send

triggers to the system timing module using PXIe_DSTARC and for the system timing module

to send triggers to peripheral modules using PXIe_DSTARB. Both PXIe_DSTARB and

PXIe_DSTARC are one directional. The PXI Express Specification requires PXI Express

chassis to limit the skew between any two PXIe_DSTAR routes to 150 ps.

The PXIe-6674 receives PXIe_DSTARB and can route it as a trigger source. The PXIe-6674

can independently select from the following sources to be routed to PXIe_DSTARC:

•