National Instruments M Series User Manual

Appendix B Timing Diagrams
M Series User Manual B-40 ni.com
Figure B-49 and Table B-33 show the setup and hold requirements of the
internal block of the DAQ-STC2. Use the table to calculate the setup and
hold times for your Source and Gate signals for the general case. In the
general case, you can determine whether the setup and hold requirements
are met by adding up the various delays of the appropriate signals through
the counter/timer circuit.
Figure B-49. DAQ-STC2 Internal Block Setup and Hold Requirements Timing Diagram
Example of the General Case
Calculate the setup and hold time requirements when the Gate and Source
come from PFI lines and the Gate is used in level mode.
Note This example shows how we determine the setup and hold times for the PFI to PFI
example above (first case) using level gating.
Table B-32. Gate to Source Setup and Hold Timing
Time Description Gating Mode
Synchronization
Mode
Min (ns) Max (ns)
t
8S
Setup time from PFI (Gate)
to PFI (Source)
Edge External Source 12.3 —
Level External Source 8.3 —
t
8H
Hold time from PFI (Gate)
to PFI (Source)
Edge External Source 0.5 —
Level External Source 2.0 —
Table B-33. DAQ-STC2 Internal Block Setup and Hold Requirements Timing
Time Parameter Min (ns) Max (ns)
t
9S
Setup 1.5 —
t
9H
Hold 0 —
t
9S
t
9H
Count_Enable
Selected_Source

National Instruments M Series Specifications

General

Brand	National Instruments
Model	M Series
Category	Media Converter
Language	English