Appendix B
Timing Diagrams
B-10
ni.com
Start
Start
is the signal that starts an AI acquisition. This signal can come from
an external source (through an external terminal) or from an internal
source. One possible internal source is a software-generated pulse. A
multiplexer selects from all the possible sources (all of them at _i level) and
outputs a signal called Selected Start. Selected Start then gets sent to the
two timing levels in the AI section (the Convert Clock Timebase and the
Sample Clock Timebase timing level) for synchronization to each clock.
Once the Convert Clock Timebase timing domain has received a valid Start,
the AI timing engine is ready to start generating converts, as soon as it
receives a Sample Clock (beginning of a sample). Once the Sample Clock
Timebase domain has received a valid Start, the AI timing engine is ready
to start generating Sample Clocks.
Table B-4.
Convert Clock and Any Internal Signal Timing
Time
Description
Line
Min (ns)
Max (ns)
t
12
_i to p_AI_Convert in external
convert mode
PFI
22.2
52.1
RTSI
22.1
51.8
STAR
21.5
49.1
