National Instruments NI 6239 Switch User Manual


 
© National Instruments Corporation 10-1 NI 6238/6239 User Manual
10
Digital Routing and Clock
Generation
The digital routing circuitry has the following three main functions.
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 M 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 M Series device.
Clock Routing
Figure 10-1 shows the clock routing circuitry of an M Series device.
Figure 10-1. M Series Clock Routing Circuitry
RTSI <0..7>
Onboard
80 MHz
Oscillator
External
Reference
Clock
(To RTSI <0..7>
Output Selectors)
10 MHz RefClk
PLL
÷
4
÷
200
÷ 8
PXI_CLK10
PXI_STAR
80 MHz Timebase
100 kHz Timebase
20 MHz Timebase