NI PXIe‑7975R FlexRIO FPGA Module – Reconfigurable, high‑throughput FPGA processing for PXI Express test and HIL

If you’re building faster, more flexible test and signal processing systems, the NI PXIe‑7975 (commonly listed as PXIe‑7975R) is one of those workhorse FlexRIO FPGA modules that typically pays off quickly. It pairs a Xilinx Kintex‑7 FPGA with high‑bandwidth PCIe and supports a wide range of NI FlexRIO Adapter Modules, so you can tailor I/O (RF, IF, high‑speed digitizers, or digital lines) without redesigning the core FPGA engine. From my experience, teams choose this model when they need deterministic, low‑latency processing and sustained streaming in the 1–2 GB/s range inside a PXI Express chassis.

Our Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery time: 1 week if in stock; no more than 1 month at the latest
• Payment: 50% advance; full payment before delivery
• Express delivery: FedEx, UPS, DHL

Key Features

• Kintex‑7 FPGA (K410T) – A solid balance of logic resources and DSP slices for real‑time signal processing, custom protocols, and hardware‑in‑the‑loop control.
• PXI Express Gen2 x4 bandwidth – Up to ~2 GB/s per direction (typically ~1.6 GB/s sustained) for fast host transfers and peer‑to‑peer streaming to other PXIe modules.
• 2 GB DDR3 DRAM (onboard) – Useful as a high‑speed buffer for bursty data or multi‑stage processing pipelines.
• Flexible I/O via FlexRIO Adapter Modules – Choose the front end you need (RF/IF transceivers, high‑speed digitizers, high‑speed digital) without changing your FPGA carrier.
• Deterministic, low‑latency processing – In many cases, you can move algorithms from software into the FPGA to cut loop times from milliseconds to microseconds.
• Peer‑to‑peer (P2P) streaming – Stream directly between modules over the backplane, bypassing the CPU for lower latency in multi‑module systems.
• NI LabVIEW FPGA toolchain support – Speeds up development and debug; you can also integrate HDL/IP where needed.

Where it’s typically used

Common scenarios include real‑time IF processing for software‑defined radio benches, protocol emulation for hardware‑in‑the‑loop rigs, and custom pattern generation/capture for high‑speed electronics manufacturing tests. One thing I appreciate is how quickly you can pivot: swap to an NI 579x RF/IF adapter for communications work this week, then move to a 573x digitizer for mixed‑signal validation next week—same FPGA carrier, same slot.

A recent customer in automotive HIL used PXIe‑7975R with peer‑to‑peer links to stream over 1 GB/s between FPGA modules, shaving several milliseconds off their loop. They mentioned it “seems to be the sweet spot” between capability and slot/power footprint.

Technical Specifications

Related or Supporting Products

• NI PXIe‑7971R – FlexRIO FPGA carrier with a smaller FPGA footprint; a cost‑sensitive option when logic/DSP resources are moderate.
• NI PXIe‑7976R – Higher‑performance FlexRIO carrier in the same family for demanding throughput or timing needs.
• NI 5791 FlexRIO IF Transceiver Adapter – Complex IF transceiver front end; great for SDR prototyping and IF signal chains.
• NI 5734 FlexRIO Adapter Module – High‑speed digitizer front end for mixed‑signal capture.
• NI 5781 / NI 5782 – DAC/ADC adapter modules for arbitrary waveform generation and digitization on the same FPGA platform.
• NI 6587 – High‑speed digital I/O adapter for custom protocols, line testing, and pattern generation/capture.

Installation & Maintenance

• Chassis & slot selection – Use a PXI Express chassis with adequate cooling. Pick a slot with a Gen2 x4 link for best bandwidth; keep adjacent slots clear if the adapter runs hot.
• Ventilation – Maintain unobstructed front‑to‑back airflow. In most cases, 25 mm clearance at the front is enough; watch inlet filters on the chassis if you’re in dusty areas.
• Wiring & grounding – Route high‑speed or RF cabling away from power bundles. Use short coax or shielded cables from the adapter to minimize skew and crosstalk.
• Timing – Leverage the PXI backplane (10 MHz/100 MHz references and triggers) for multi‑module synchronization. It appears that peer‑to‑peer plus shared clocks is the simplest way to reduce end‑to‑end latency.
• Firmware & FPGA images – Keep the LabVIEW FPGA runtime and adapter drivers updated. Back up bitfiles tied to specific test revisions to avoid accidental regressions.
• Routine care – Quarterly dust cleaning with dry air (low pressure). Annual functional check and thermal inspection are typically enough; re‑seat the adapter if you notice intermittent I/O.

Quality & Certifications

• CE and RoHS compliant; manufactured under ISO 9001 quality systems
• Meets PXI Express interoperability standards
• Manufacturer’s standard limited warranty (typically 1 year); our coverage: 365‑day warranty

If you’d like, share the adapter module you plan to pair with PXIe‑7975R and the target data rates. We can sanity‑check slot bandwidth, peer‑to‑peer paths, and memory buffering so you don’t run into throughput surprises later.