II. Model Interpretation

PXI: 3U single-slot PXI module, compatible with PXI/PXIe mixed slots.

6541: 654x (high-speed digital waveform instrument); 1 = 50 MHz (6542 = 100 MHz).

Core Identifier: 32-way bidirectional, multi-level, 50 MHz, SMC synchronous core, onboard deep memory.

III. Technical Parameters (25℃) General

Channel: 32 single-ended bidirectional I/O, each channel has independent input/output.

Level: Software selectable 1.8/2.5/3.3/5.0 V TTL/CMOS.

Drive: ±24 mA per channel, can directly drive logic devices and bus interfaces.

Memory: 1/8/64 Mbit per channel (depending on model), supports long waveforms / complex sequences.

Rate and Timing

Clock: Maximum 50 MHz (internal / external / reference clock).

Edges: Rising / Falling / Delayed edges selectable, channel skew ±600 ps (typical).

Trigger: PXI trigger bus, STAR trigger, PFI, minimum pulse width 40 ns.

Synchronization: SMC (Synchronous with Storage Core), multi-module nanosecond-level synchronization.

Physical and Environmental

Size: 3U single slot (160×100 mm).

Power consumption: Typical 15 W, maximum 20.5 W.

Connectors: 68-pin VHDCI (I/O) + 3×SMB (clock / trigger).

Temperature: 0～55℃ (commercial); extended grade -40℃～+85℃.

IV. Interface and Communication Configuration

Hardware Interface

I/O: 68-pin VHDCI, recommended cable SHC68-C68-D4.

Clock / Trigger: 3×SMB (CLK IN/OUT, PFI), supports external 50 MHz clock input.

Bus: PXI bus, DMA bus master mode, low CPU usage.

Software and Drivers

Driver: NI-HSDIO, paired with Digital Waveform Editor waveform editing software.

Development Environment: LabVIEW, Python, C#, TestStand, supports scripted sequences.

Synchronization: PXI trigger / RTSI/STAR, mixed-signal synchronization with digitizers, AWGs, etc.

V. Core Functions

32-level multi-level high-speed bidirectional I/O: 1.8～5 V software switching, suitable for multi-voltage devices such as MCUs/FPGAs/ memories; each channel has independent direction, flexible configuration of buses / control signals.

50 MHz waveform generation / acquisition: generates / captures high-speed digital timing, protocol signals (such as SPI, I2C, UART, parallel buses); ±600 ps skew, meets high-speed timing verification requirements.

Deep memory + advanced sequences: each channel up to 64 Mbit, stores long waveforms; supports looping, branching, conditional triggering, simulating complex workflows.

SMC synchronization core: multi-module synchronization expanded to hundreds of channels, nanosecond-level timing alignment; seamless integration with digitizers, AWGs, power supplies, building a complete mixed-signal ATE.

Rich triggers and filtering: edge / level / mode-matched triggers; software programmable input filtering to suppress noise, improve stability.

VI. Application Scenarios

High-speed digital chip verification: timing / functional testing of FPGA/CPLD, MCU, interface chips (USB, Ethernet, DDR), boundary scan, protocol simulation.

Mixed-signal ATE/FCT: PCB functional testing, simulating high-speed digital interfaces, collecting / generating control signals, synchronizing analog measurements (voltage / current).

Memory testing: read/write timing verification, data integrity testing, high-speed bus simulation of SRAM/Flash/DDR.

Communication and protocol testing: main / slave simulation of SPI, I2C, UART, CAN, LVDS, etc., compliance testing of timing. Automotive Electronics: High-speed digital I/O testing for on-board ECU, ADAS, and body modules, communication bus verification.

VII. Installation and Maintenance Instructions

Installation and Power On

Installation: Power off, insert into the 3U slot of the PXI chassis, ensure reliable grounding of the chassis, and perform electrostatic protection operation.

Power On: After powering on, NI-HSDIO automatically self-checks without preheating; avoid frequent cold-hot restarts.

Environment: Keep the air ducts unobstructed, 0-55℃; stay away from strong electromagnetic interference (motors, frequency converters).

Wiring and Operation

Wiring: Avoid frequent plugging and unplugging of the VHDCI interface, use SHC68-C68-D4 cable; for long distances, use shielded twisted pair, single-ended grounding.

Level Configuration: Strictly set the voltage of DUT to 1.8/2.5/3.3/5 V, to prevent overvoltage damage to components.

High-speed Design: 50 MHz signal matching impedance, short traces, complete ground plane, to reduce reflection and crosstalk.

Daily Maintenance

Interfaces: Regularly clean the VHDCI/SMB interfaces, prevent dust and moisture; install dust covers when idle.

Software: Update NI-HSDIO drivers and firmware to obtain function optimization and bug fixes.

Calibration: Digital circuits do not require regular calibration; check the wiring tightness and cable integrity annually.