PXIe-6544 32-Channel 100 MHz Digital Waveform Instrument
The NI PXIe-6544 is a PXI Express digital waveform generator and analyzer designed for digital interface testing, device validation, protocol development and automated production test. It provides 32 bidirectional single-ended digital channels, a maximum sample clock rate of 100 MHz and a maximum data rate of 100 Mbit/s per channel.
The PXIe-6544 supports common 1.2 V, 1.5 V, 1.8 V, 2.5 V and 3.3 V digital logic families. It also provides waveform scripting, flexible clocking, per-bank timing adjustment and PXI synchronization for constructing repeatable digital and mixed-signal test systems.
Installed in a compatible PXI Express chassis, the module can operate alongside oscilloscopes, waveform generators, digital multimeters, power supplies and other PXI modules.
PXIe-6544 Product Overview
The PXIe-6544 combines high-speed digital waveform generation and acquisition in a single one-slot PXI Express module. Its 32 digital channels can generate stimulus patterns for a device under test or acquire digital responses for software-based analysis.
Compared with conventional static digital I/O modules, the PXIe-6544 provides faster operation, deeper onboard waveform memory, deterministic clocking and programmable digital timing. These capabilities make it suitable for testing embedded devices, FPGAs, digital sensors, memory devices and custom parallel interfaces.
The PXIe-6544 is available in two primary onboard memory configurations:
- 780992-02: 8 Mbit of onboard memory per channel
- 780992-03: 64 Mbit of onboard memory per channel
The appropriate memory version depends on the required pattern length, acquisition depth and number of waveform segments used by the test program.
Key Features of the PXIe-6544
32 Bidirectional Digital Channels
The PXIe-6544 provides 32 single-ended digital channels that can generate or acquire digital data. The channel count supports common 8-bit, 16-bit and 32-bit parallel interfaces while allowing individual channels to be assigned to data, address, command or status signals.
100 MHz Maximum Sample Clock
The onboard sample clock can operate from 100 Hz to 100 MHz. This broad timing range allows the same module to perform low-speed functional testing and higher-speed digital waveform validation.
100 Mbit/s Per-Channel Data Rate
The module supports a maximum single data rate of 100 Mbit/s per channel. Data is generated or acquired on one selected edge of the sample clock, providing deterministic timing across all 32 digital channels.
Selectable Digital Logic Families
The PXIe-6544 supports standard 1.2 V, 1.5 V, 1.8 V, 2.5 V and 3.3 V logic families. The selected logic family determines the generation voltage and acquisition threshold used by the digital channels.
Generation and acquisition sessions share a common voltage resource. Simultaneous operations must therefore use the same configured logic family.
Per-Bank Timing Adjustment
Digital channels are organized into timing banks that support programmable data delay. Engineers can use these adjustments to compensate for cable propagation delay, test-fixture skew and DUT setup-and-hold requirements.
Flexible Clock Sources
Waveforms can use the onboard clock, an external clock connected through CLK IN or a source-synchronous STROBE for acquisition. Clock output resources allow the PXIe-6544 to share timing with the DUT and other instruments.
Waveform Scripting
Onboard scripting supports waveform sequencing, looping, branching and trigger-controlled execution. Reusing common waveform segments can reduce memory consumption and simplify complex digital transactions.
PXI Express Synchronization
The PXIe-6544 can use PXI Express reference clocks and trigger resources to coordinate digital measurements with other modular instruments in a mixed-signal test system.
PXIe-6544 Technical Specifications
| Product Model | NI PXIe-6544 |
|---|---|
| Product Type | Digital Waveform Generator/Analyzer |
| Bus and Form Factor | PXI Express, single-slot 3U module |
| Bidirectional Digital Channels | 32 |
| Signaling Type | Single-ended |
| Maximum Sample Clock Rate | 100 MHz |
| Maximum Data Rate | 100 Mbit/s per channel |
| Data Transfer Mode | Single data rate |
| Supported Logic Families | 1.2 V, 1.5 V, 1.8 V, 2.5 V and 3.3 V |
| Output Impedance | 50 Ω nominal |
| Input Impedance | 50 kΩ nominal |
| Input Protection | -1 V to 5 V |
| Onboard Clock Range | 100 Hz to 100 MHz |
| External CLK IN Range | 20 kHz to 100 MHz when used as a sample clock |
| STROBE Range | 100 Hz to 100 MHz |
| Programmable Function Interface | 4 PFI channels |
| Hardware Data Comparison | Not supported |
| Active Load | Not supported |
| Per-Pin PMU | Not supported |
| Onboard Memory Options | 8 Mbit/channel or 64 Mbit/channel |
| 8 Mbit/Channel Part Number | 780992-02 |
| 64 Mbit/Channel Part Number | 780992-03 |
| Clock Connections | SMA CLK IN and CLK OUT |
| Digital Interface | Digital Data and Control connector |
| Compatible Cable | SHC68-C68-D4 |
| Driver | NI-HSDIO |
| Module Width | 1 PXI Express slot |
How the PXIe-6544 Works
During digital generation, waveform data is transferred from the PXI controller to onboard memory. The PXIe-6544 outputs the stored data using the selected sample clock, logic family, channel direction and timing configuration.
During acquisition, the module samples digital signals from the DUT and stores the captured values in onboard memory. The acquired data is transferred to the controller for decoding, comparison, visualization or automated pass/fail analysis.
The PXIe-6544 does not provide hardware-based expected-data comparison. Applications requiring real-time hardware comparison should consider the PXIe-6547 or PXIe-6548.
Clocking and Timing Options
Onboard Sample Clock
The internal clock provides a programmable range from 100 Hz to 100 MHz. It is suitable for generation and acquisition when the test system does not require an external timing source.
External CLK IN
An external sample clock can be connected through the front-panel CLK IN connector. This allows the PXIe-6544 to synchronize with another instrument, an external clock generator or the DUT.
Source-Synchronous STROBE
The STROBE input can be used as the acquisition sample clock. This function is useful for source-synchronous digital interfaces in which the DUT transmits data together with a clock or strobe.
Clock Export
The module can export clock signals through the front-panel CLK OUT connector. A generation sample clock can also be routed through the digital interface to provide synchronized timing to the DUT.
Data Delay Adjustment
Per-bank delay adjustment allows groups of channels to be shifted relative to the sample clock. This helps compensate for fixture skew and improves the available setup-and-hold margin.
Onboard Memory and Scripting
The PXIe-6544 uses NI Synchronization and Memory Core architecture. Waveform samples and script instructions share onboard memory, giving test developers flexibility in organizing digital test sequences.
Waveform scripting can be used to:
- Sequence multiple digital waveforms
- Repeat selected pattern sections
- Wait for software or hardware triggers
- Reuse initialization and idle patterns
- Reduce duplicated waveform data
- Create longer test sequences from smaller segments
PXIe-6544 Memory Options
780992-02 with 8 Mbit per Channel
The 8 Mbit/channel configuration is suitable for short and medium-length patterns, repeated transactions and applications that use scripting to reuse stored waveform segments.
780992-03 with 64 Mbit per Channel
The 64 Mbit/channel configuration provides additional storage for long nonrepeating patterns, deeper acquisitions and test programs containing multiple waveform sets.
Actual sample depth depends on the active channel width, waveform organization, acquisition requirements and number of script instructions stored in memory.
Typical PXIe-6544 Applications
- Digital interface testing
- Parallel bus generation and acquisition
- FPGA and ASIC interface validation
- Embedded controller testing
- Memory device functional testing
- Digital sensor simulation
- Register-level device communication
- Custom protocol testing
- Digital waveform characterization
- Hardware-in-the-loop testing
- Mixed-signal electronic validation
- Automated production testing
- Research and laboratory measurement
PXIe-6544 for Custom Protocol Testing
The PXIe-6544 is a waveform-based instrument rather than a fixed-protocol analyzer. Engineers can define pattern data, signal direction, logic family, sample timing and control sequences through software.
This approach supports proprietary and nonstandard digital interfaces within the instrument’s channel, voltage and timing limits. Protocol encoding and response analysis are typically handled by the host application.
Mixed-Signal System Integration
Many electronic devices require digital control combined with analog stimulus and measurement. The PXIe-6544 can operate in the same chassis as PXI digitizers, arbitrary waveform generators, digital multimeters, programmable power supplies and RF instruments.
PXI backplane reference clocks and trigger lines help coordinate these modules. A complete system can generate digital commands, apply analog stimulus and capture multiple DUT responses within a synchronized automated sequence.
PXIe-6544 Software Support
The PXIe-6544 is controlled through the NI-HSDIO instrument driver. NI-HSDIO provides functions for waveform generation, acquisition, scripting, clock configuration, triggering and data transfer.
Supported development environments include:
- LabVIEW
- LabWindows/CVI
- Measurement Studio
- Microsoft Visual C/C++
- .NET languages, including C# and Visual Basic .NET
NI Measurement & Automation Explorer can be used to identify the module, verify driver installation, view device information and perform preliminary hardware checks.
PXIe-6544 System Requirements
A complete PXIe-6544 system normally requires:
- A compatible PXI Express chassis
- An embedded PXI controller or external computer interface
- NI-HSDIO driver software
- A compatible high-speed digital cable
- A terminal block, breakout accessory or custom DUT fixture
- Optional clock and trigger cables
- Application development software
Before purchasing, verify the PXI Express slot type, controller operating system, driver compatibility, waveform memory requirement and DUT connection method.
Compatible Cables and Accessories
Common connectivity options for the PXIe-6544 include:
- SHC68-C68-D4 shielded high-speed digital cable
- SCB-68A shielded connector block
- TBX-68 connector block
- CB-68LP unshielded connector block
- Custom controlled-impedance DUT interface fixtures
Select the cable and terminal accessory according to the required data rate, shielding, grounding and DUT connector configuration.
Signal-Integrity Considerations
Reliable operation at 100 Mbit/s requires appropriate cabling and fixture design. Excessive cable length, impedance discontinuities, poor grounding and unterminated branches can cause ringing, reflections and timing errors.
Recommended practices include:
- Use a short, compatible high-speed digital cable
- Maintain controlled impedance through the test fixture
- Provide a low-inductance ground connection
- Avoid unnecessary adapters and unterminated stubs
- Select the correct DUT logic family
- Use timing adjustment to compensate for known skew
- Verify signal quality at the DUT connection point
PXIe-6544 vs PXIe-6545
| Specification | PXIe-6544 | PXIe-6545 |
|---|---|---|
| Bidirectional Channels | 32 | 32 |
| Maximum Sample Clock | 100 MHz | 200 MHz |
| Maximum Data Rate | 100 Mbit/s | 200 Mbit/s |
| Logic Families | 1.2 V, 1.5 V, 1.8 V, 2.5 V and 3.3 V | 1.2 V, 1.5 V, 1.8 V, 2.5 V and 3.3 V |
| Hardware Comparison | No | No |
| Primary Difference | Standard 100 MHz operation | Higher-speed 200 MHz operation |
The PXIe-6545 is the direct higher-speed alternative when an application requires a sample clock or data rate above 100 MHz. Both models provide the same basic channel count and selectable logic families.
PXIe-6544 vs PXIe-6547
| Specification | PXIe-6544 | PXIe-6547 |
|---|---|---|
| Bidirectional Channels | 32 | 32 |
| Maximum Sample Clock | 100 MHz | 100 MHz |
| Maximum Data Rate | 100 Mbit/s SDR | 200 Mbit/s with DDR |
| Voltage Configuration | Selectable standard logic levels | Programmable from 1.2 V to 3.3 V |
| Hardware Comparison | No | Yes |
| Primary Advantage | Standard waveform generation and acquisition | DDR operation and hardware comparison |
The PXIe-6547 is preferable when the application requires hardware comparison, programmable voltage settings or a 200 Mbit/s DDR data rate.
Comparison with Similar PXI Digital Instruments
| Model | Channels | Maximum Clock | Maximum Data Rate | Hardware Compare | General Positioning |
|---|---|---|---|---|---|
| PXIe-6544 | 32 | 100 MHz | 100 Mbit/s | No | Standard digital waveform testing |
| PXIe-6545 | 32 | 200 MHz | 200 Mbit/s | No | Higher-speed standard-logic testing |
| PXIe-6547 | 32 | 100 MHz | 200 Mbit/s with DDR | Yes | Programmable-voltage waveform testing |
| PXIe-6548 | 32 | 200 MHz | Up to 400 Mbit/s with DDR | Yes | Higher-speed programmable-voltage testing |
| PXIe-6556 | 24 | 200 MHz | 200 Mbit/s | Yes | Digital testing with parametric capability |
PXIe-6544 vs Digital Pattern Instruments
The PXIe-6544 is intended for digital waveform generation and acquisition. It does not include hardware comparison, active-load circuitry or per-pin parametric measurement units.
A digital pattern instrument such as the PXIe-6571 is more suitable for semiconductor characterization and production testing that requires per-pin voltage resources, active loads, expected-data comparison and DC parametric measurements.
Recommended Related Products
- PXIe-6545 – 32-channel, 200 MHz digital waveform instrument for higher-speed interfaces.
- PXIe-6547 – 32-channel digital waveform instrument with DDR operation, programmable voltage and hardware comparison.
- PXIe-6548 – 200 MHz instrument supporting data rates up to 400 Mbit/s and hardware comparison.
- PXIe-6556 – 24-channel digital waveform instrument with a wider voltage range and parametric measurement capability.
- PXIe-6571 – digital pattern instrument for semiconductor validation and production test.
- PXIe-1085 – high-bandwidth PXI Express chassis for synchronized test systems.
PXIe-6544 Selection Guidance
Before selecting the PXIe-6544, confirm that:
- The DUT uses single-ended digital signaling
- No more than 32 bidirectional channels are required
- The DUT uses one of the supported standard logic families
- The required sample clock does not exceed 100 MHz
- The required data rate does not exceed 100 Mbit/s
- Hardware data comparison is not required
- Active-load and per-pin PMU functions are not required
- The selected memory option provides sufficient waveform depth
- The chassis has a compatible PXI Express peripheral slot
Common Troubleshooting Checks
The PXIe-6544 Is Not Detected
Confirm that the module is fully seated in a compatible PXI Express slot and that a supported NI-HSDIO driver is installed. Use NI MAX to verify that the module appears and passes its self-test.
Acquired Data Contains Timing Errors
Verify the clock source, selected sampling edge, logic family and channel direction. Inspect the cable and fixture for signal-integrity problems, and adjust the channel-bank timing if necessary.
The DUT Does Not Recognize Generated Data
Confirm that the selected logic family matches the DUT voltage requirement. Check clock polarity, data direction, pattern format and the DUT’s setup-and-hold specifications.
External Clocking Is Unstable
Verify that the external clock meets the required frequency, amplitude and duty-cycle limits. Use a suitable coaxial cable and confirm the correct clock source in the application.
Waveform Memory Is Insufficient
Use waveform scripts, loops and reusable pattern segments to reduce duplicated data. Select the 64 Mbit/channel version for long nonrepeating patterns or deeper acquisitions.
Frequently Asked Questions
What is the PXIe-6544 used for?
The PXIe-6544 generates and acquires digital waveforms for interface testing, FPGA validation, embedded device testing and automated electronic test systems.
How many digital channels does the PXIe-6544 provide?
It provides 32 bidirectional single-ended digital channels.
What is the maximum sample clock rate?
The maximum sample clock rate is 100 MHz.
What is the maximum data rate?
The PXIe-6544 supports a maximum data rate of 100 Mbit/s per channel.
Which logic levels does the PXIe-6544 support?
It supports selectable 1.2 V, 1.5 V, 1.8 V, 2.5 V and 3.3 V digital logic families.
Does the PXIe-6544 support DDR operation?
No. The PXIe-6544 operates in single data rate mode.
Does the PXIe-6544 support hardware comparison?
No. Expected and acquired data must normally be compared in the host application.
Does the PXIe-6544 include a PMU?
No. It does not include active-load circuitry or a per-pin parametric measurement unit.
What are the PXIe-6544 part numbers?
Part number 780992-02 provides 8 Mbit of memory per channel, while part number 780992-03 provides 64 Mbit per channel.
Which driver controls the PXIe-6544?
The module is controlled using the NI-HSDIO instrument driver.
Can the PXIe-6544 use an external sample clock?
Yes. An external clock can be supplied through CLK IN, while the STROBE input can serve as the acquisition sample clock.
Can the PXIe-6544 operate independently?
No. It requires a compatible PXI Express chassis and an embedded controller or external computer interface.
Why Choose the PXIe-6544?
The PXIe-6544 is a practical choice for applications requiring 32 channels of synchronized digital waveform generation and acquisition at data rates up to 100 Mbit/s. It combines standard logic-level support, flexible clocking, waveform scripting and per-bank timing control in a compact PXI Express module.
Its modular architecture makes it suitable for both standalone digital interface validation and integrated mixed-signal automated test systems.
Request a Quote for the PXIe-6544
Contact us for current availability, lead time and project pricing for the NI PXIe-6544 Digital Waveform Instrument. Please specify whether you require part number 780992-02 with 8 Mbit/channel or part number 780992-03 with 64 Mbit/channel.
We can also help identify compatible PXI Express chassis, embedded controllers, high-speed digital cables, terminal accessories and related instruments for your test system.
