National Instruments FlexRIO NI-7931R, User Manual

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3-5
NI-793xR User Manual
Clocking Architecture
The NI-7931R device includes dedicated clocking hardware to provide a flexible clocking
solution for your FlexRIO system. Refer to Chapter 4,
Developing with LabVIEW FPGA , for
information about configuring clocks with LabVIEW FPGA.
The NI-7931R clocking architecture includes the following clocks:
• 10 MHz Reference Clock
• 40 MHz Onboard Clock (default)
• 100 MHz Clock
• 200 MHz Clock
• DRAM Clock
The following figure illustrates the clocking circuitry on the NI-7931R.
Figure 3-5.
NI-7931R Clocking Diagram
Memory
Controller
PLL
40 MHz
100 MHz
100
MHz
10 MHz
Reference Clock Kintex-7 FPGA
200 MHz
DRAM
Clock
166 MHz
Ad a pter
Mod u le
PLL
100 MHz
O s cill a tor
REF IN
IoMod S yncClock
Ref Clk En ab le