The demanding timing and synchronization requirements of instrumentation systems are metby the integrated features of PXI Express. Not only are the trigger bus, 10 MHz systemreference clock, and star trigger bus available in PXI retained by PXI Express, but new timingand synchronization features that include a 100 MHz differential system reference clock forthe synchronization of multiple modules and three differential star trigger buses for thedistribution of precise clock and trigger signals have been added. Differential timing andsynchronization signals provide PXI Express systems with increased noise immunity and theability to transmit clock signals at higher frequencies.NI PXIe-8840 Quad-CoreDescriptionThe NI PXIe-8840 Quad-Core PXI Express/CompactPCI Express embedded controller is ahigh-performance PXI Express/CompactPCI Express-compatible system controller. TheNI PXIe-8840 Quad-Core controller integrates standard I/O features in a single unit by usingstate-of-the-art packaging. Combining an NI PXIe-8840 Quad-Core embedded controller witha PXI Express-compatible chassis, such as the NI PXIe-1085, results in a fully PC-compatiblecomputer in a compact, rugged package.The NI PXIe-8840 Quad-Core has an Intel® Core™ i7 5700EQ processor (2.6 GHz quad-coreprocessor), all the standard I/O, and a 320 GB (or larger) hard drive. It also has a PCI-basedGPIB controller and an ExpressCard/34 expansion slot1.The standard I/O on each module includes two DisplayPort video, one RS-232 serial port, fourHi-Speed USB ports, two SuperSpeed USB ports, two Gigabit Ethernet, a reset button, and aPXI trigger.Functional OverviewThe NI PXIe-8840 Quad-Core is a modular PC in a PXI Express 3U-size form factor. Thefollowing figure is a functional block diagram of the NI PXIe-8840 Quad-Core. Following thediagram is a description of each logic block shown.1 Available on the NI PXIe-8840 Quad-Core ExpressCard variant only.NI PXIe-8840 Quad-Core User Manual | © National Instruments | 3