National Instruments NI 6251 User Manual

Appendix B Timing Diagrams
© National Instruments Corporation B-35 M Series User Manual
Figure B-41. Counter/Timer Circuitry
Pin to Internal Signal Delays
Input timing is the timing specification for importing a signal to an internal
bus on the M Series device. Table B-26 shows the input timing for the
counters on all input terminals. Signals refer to the signal at the I/O
connector of the device, and signals appended with _i refer to the signal
internal to the device after the input buffer.
Figure B-42. Pin to Internal Signal Delays Timing Diagram
Table B-26. Pin to Internal Signal Delays Timing
Time From To Min (ns) Max (ns)
t
1
*
PFI PFI_i 5.2 6.2 18.2 22.0
RTSI RTSI_i 2.0 2.5 5.0 6.0
STAR STAR_i 0.9 — — 2.5
*
The delay ranges given for PFI and RTSI represent the fastest and slowest terminal routing within the trigger group for a
given condition (maximum or minimum timing). This difference can be useful when two external signals will be used
together and the relative timing between the signals is important.
32-Bit
Counter
Gate
Logic
PFI, RTSI,
or PXI_STAR
(Counter
n Source)
PFI, RTSI,
or PXI_STAR
(Counter
n Gate)
PFI, RTSI,
or PXI_STAR
(Counter
n
Internal Output)
Count_Enable
Other Internal
Signals
PFI_i, RTSI_i,
or PXI_STAR_i
Selected_Gate
Selected_Source
Out_o
PFI, RTSI,
or PXI_STAR
80 MHz Timebase
20 MHz Timebase
100 kHz Timebase
PXICLK10
t
1
t
1
PFI, RTSI,
or PXI_STAR
PFI_i, RTSI_i,
or PXI_STAR_i

National Instruments NI 6251 Specifications

General

Brand	National Instruments
Model	NI 6251
Category	Media Converter
Language	English