Digital Routing And Clock Generation; Clock Routing - National Instruments DAQ X Series User Manual

Digital Routing and Clock
Generation
The digital routing circuitry has the following main functions:
•
•
•

Clock Routing

Figure 9-1 shows the clock routing circuitry of an X Series device.
Onboard
100 MHz
Oscillator
RTSI <0..7>
PXIe_CLK100
PXI_STAR
PFI
PXIe-DSTAR<A, B>
© National Instruments
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Manages the flow of data between the bus interface and the
acquisition/generation sub-systems (analog input, analog output,
digital I/O, and the counters). The digital routing circuitry uses FIFOs
(if present) in each sub-system to ensure efficient data movement.
Routes timing and control signals. The acquisition/generation
sub-systems use these signals to manage acquisitions and generations.
These signals can come from the following sources:
– Your X Series device
– Other devices in your system through RTSI
– User input through the PFI terminals
– User input through the PXI_STAR terminal
Routes and generates the main clock signals for the X Series device.
÷ 10
External
Reference
Clock
PLL
Figure 9-1. X Series Clock Routing Circuitry
9-1
9
10 MHz RefClk
(To RTSI <0..7>
Output Selectors)
100 MHz
Timebase
20 MHz
÷
5
Timebase
100 kHz
÷
200
Timebase
X Series User Manual