National Instruments NI 6251 User Manual

Appendix B Timing Diagrams
M Series User Manual B-32 ni.com
Table B-22. DI Timing Delays
Time From To Min (ns) Max (ns)
t
3
*
PFI PFI_i 5.2 6.2 18.2 22.0
RTSI RTSI_i 2.0 2.5 5.0 6.0
PXI_STAR PXI_STAR_i 1.5 3.5
t
4
PFI_i, RTSI_i, PXI_STAR_i, or
other internal signal
DI Sample Clock 3.5 9
t
7
P0 P0_i 4.7 20.1
t
8
DI Sample Clock PFI (output) 8.0 29.8
t
9
†
PFI (output) high PFI (output) low One period of
80 MHz Timebase
Two periods of
80 MHz Timebase
*
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.
†
When DI Sample Clock is routed to a PFI output pin, the pulse width of the output is independent of the pulse width of the
input. The pulse width is specified in a number of periods of the 80 MHz Timebase
Table B-23. DI Timing Requirements
Time Requirement Condition Min (ns) Max (ns)
t
1
PFI, RTSI, or PXI_STAR
Minimum Period
When used as DI Sample
Clock
NI 622x devices: 1000.0
NI 625x/628x devices: 100.0
—
t
2
PFI, RTSI, or PXI_STAR
Minimum Pulse Width
When used as DI Sample
Clock
12.0 —
t
5
Setup time From P0_i to
DI Sample Clock
— 1.5 —
t
6
Hold time From DI Sample
Clock to P0_i
— 0 —

National Instruments NI 6251 Specifications

General

Brand	National Instruments
Model	NI 6251
Category	Media Converter
Language	English