The NI-6581 is a 100 MHz, 54-line single-ended digital I/O adapter for NI FlexRIO FPGA-based digital instrumentation.
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Key product information and technical features.
Used with an NI FlexRIO FPGA module, the NI-6581 supports programmable digital pattern generation and acquisition. NI demonstrates independent generation and acquisition timing with this adapter.
PFI lines can carry control signals or serve as additional data lines; NI confirms that they share the electrical characteristics of the main data lines.
Verified product specifications.
| Channel organization | 48 data plus 6 PFI; 27 lines per connector |
|---|---|
| Front-panel data connectors | Two 68-pin VHDCI |
| Data direction control | Per 8-bit port |
| Nominal digital output impedance | 50 Ω |
| Documented logic levels | 1.8, 2.5, 3.3; 5.0 requires external supply V |
| Maximum clock toggle rate | 100 at reference voltage ≥3.3 V MHz |
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Manufacturer
FPGA instrumentation platform
Digital I/O adapter
Supported FPGA module families: NI PXI-795xR and NI PXIe-796xR.
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Product-specific answers based on available technical information.
NI specifies PXI-795xR and PXIe-796xR FPGA modules only.
Yes. NI confirms that the NI-6581 PFI lines can be used for data as well as control signals.
NI lists SHC68-C68-D4 and C68-C68-D4 cables for the NI-6581.