NI PXIe-7976R

NI PXIE-7976R is an NI FlexRIO FPGA Module for PXI Express, documented by NI as the FPGA base module in a FlexRIO system rather than an adapter module or accessory. NI also uses the shorter name PXIe-7976 on its specifications page; the supplied official sources indicate these names refer to the same hardware family/model naming, not distinct performance variants. This module is intended to pair with compatible NI FlexRIO adapter modules, with adapter-specific I/O behavior and measurement characteristics documented separately by NI.

At the module level, NI specifies a Xilinx Kintex-7 XC7K410T FPGA with 2 GB DDR3 DRAM and 3.2 GB/s memory bandwidth. The PXIe-7976R provides 136 general-purpose FPGA DIO channels that can be configured as 136 single-ended channels, 68 differential channels, or a mixed arrangement. NI also specifies 32 DMA channels, a 40 MHz default timebase, and a PXI Express 100 MHz reference source (PXIe_CLK100).

For system integration, NI documents an x4 PCI Express Gen 2 bus interface for the PXIe-7976R. NI also states that the module supports peer-to-peer streaming among FPGA modules or select PXI Express modules, which can help reduce host involvement in data movement for suitable PXI Express architectures. Because the PXIe-7976R is the FPGA base module, application capability depends in part on the selected FlexRIO adapter module used with it.