Appendix B Timing Diagrams
M Series User Manual B-36 ni.com
Selected Gate and Selected Source Delays
Tables B-27 and B-28 show the timing for the Selected Source and Selected
Gate internal signals.
Selected Source is used to clock the 32-bit counter. Selected Gate drives the
Gate Logic, which generates the Counter Enable signal.
All internal counter timing is referenced to these two signals. Any internal
signal refers to signals with _i from the previous table or signals coming
from another subsystem inside the M Series device. It does not include
internal timebases or the PXI_CLK10.
Figure B-43. Selected Gate Delays Timing Diagram
Figure B-44. Selected Source Delays Timing Diagram
Table B-27. Selected Gate Delays Timing
Time From To Min (ns) Max (ns)
t
2
PFI_i, RTSI_i, PXI_STAR_i, or any
internal signal
Selected Gate 1.0 6.0
t
2
t
2
PFI_i, RTSI_i,
or PXI_STAR_i
Selected_Gate
t
3
t
3
PFI_i, RTSI_i,
or PXI_STAR_i
Selected_Source
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