Chapter 3
Hardware Overview
©
National Instruments Corporation
3-17
NI PXI-6682 Series User Manual
Figure 3-6.
Asynchronous Routing Operation
Some delay is always associated with an asynchronous route, and
this delay varies among NI PXI-6682 Series modules, depending on
variations in temperature and chassis voltage. Typical delay times in the
NI PXI-6682 Series for asynchronous routes between various sources
and destinations are given in Appendix A,
.
Asynchronous routing works well if the total system delays are not too long
for the application. Propagation delay could be caused by the following
reasons:
•
Output delay on the source
•
Propagation delay of the signal across the backplane(s) and cable(s)
•
Propagation delay of the signal through the NI PXI-6682 Series
•
Time for the receiver to recognize the signal
The source of an asynchronous routing operation on the
NI PXI-6682 Series can be any of the following lines:
•
Any front panel PFI pin (PFI<0..2>)
•
Any PXI Star trigger line (PXI_STAR<0..12>) (NI PXI-6682 only)
•
Any PXI Trigger line (PXI_TRIG<0..7>)
•
Synchronized time events
•
PXI_CLK10
•
Ground
The destination of an asynchronous routing operation on the
NI PXI-6682 Series can be any of the following lines:
•
Any front panel PFI pin (PFI<0..2>)
•
Any PXI star trigger line (PXI_STAR<0..12>) (NI PXI-6682 only)
•
Any PXI Trigger line (PXI_TRIG<0..7>)
Trigger Inp
u
t
Trigger O
u
tp
u
t
Prop
a
g
a
tion Del
a
y
t
pd
