{"id":30605,"date":"2025-09-30T13:24:15","date_gmt":"2025-09-30T05:24:15","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=30605"},"modified":"2026-08-27T21:05:02","modified_gmt":"2026-08-27T13:05:02","slug":"ni-6581b","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/ni-6581b\/","title":{"rendered":"\u041d\u0418-6581\u0411"},"content":{"rendered":"<h3>Product Introduction<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>NI\u20116581B<\/strong> \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f <strong>100 MHz, 54-channel single-ended digital I\/O adapter module for NI FlexRIO<\/strong>. It is designed for high-speed digital acquisition, digital waveform generation, device interface testing, custom protocol implementation and deterministic FPGA-based data processing.\n<\/p>\n<p>\nWhen combined with a compatible <strong>FlexRIO FPGA module<\/strong> or Controller for FlexRIO, the NI\u20116581B creates a programmable digital instrument capable of interfacing with digital devices through 48 bidirectional data channels and six programmable function interface channels.\n<\/p>\n<p>\nThe NI\u20116581B is suitable for semiconductor validation, FPGA and ASIC testing, embedded system development, custom digital communication, hardware-in-the-loop testing, electronic design verification and automated production test applications.\n<\/p>\n<h3>Product Overview<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>National Instruments NI\u20116581B<\/strong> belongs to the NI FlexRIO digital adapter module family. Its standard part number is <strong>783887\u201101<\/strong>.\n<\/p>\n<p>\nThe module provides the electrical interface between a digital device under test and the user-programmable FPGA resources of a compatible FlexRIO system.\n<\/p>\n<p>\nA typical system architecture is:\n<\/p>\n<p>\n<strong>Digital DUT \u2194 NI\u20116581B \u2194 FlexRIO FPGA Module \u2194 PXI\/PXIe System \u2194 Host Application<\/strong>\n<\/p>\n<p>\nThe NI\u20116581B handles single-ended digital signal acquisition and generation, while the associated FPGA implements timing, direction control, triggering, protocol processing, pattern generation, data reduction and host communication.\n<\/p>\n<h3>Key Features<\/h3>\n<h4>54 Single-Ended Digital I\/O Channels<\/h4>\n<p>\nThe NI\u20116581B provides <strong>54 single-ended digital I\/O channels<\/strong> across two digital data connectors.\n<\/p>\n<p>\nThe channel architecture includes:\n<\/p>\n<ul>\n<li>48 bidirectional digital data channels<\/li>\n<li>Six programmable function interface channels<\/li>\n<li>Two external global clock inputs<\/li>\n<li>Two clock output terminals<\/li>\n<\/ul>\n<p>\nThis channel configuration supports parallel digital acquisition, waveform generation, device communication and application-specific control functions.\n<\/p>\n<h4>48 Bidirectional Data Channels<\/h4>\n<p>\nThe 48 primary data channels are arranged as six 8-bit ports distributed across the two front-panel connectors.\n<\/p>\n<p>\nDirection control is configurable by 8-bit port, allowing different groups of channels to perform input or output operations according to the FPGA application.\n<\/p>\n<p>\nBidirectional operation makes the NI\u20116581B suitable for applications that require both device stimulation and response acquisition within the same programmable test system.\n<\/p>\n<h4>Six Programmable Function Interface Channels<\/h4>\n<p>\nIn addition to the 48 data channels, the NI\u20116581B provides six PFI channels, with three PFI lines available on each digital data connector.\n<\/p>\n<p>\nThese channels can participate in programmable control, handshaking, triggering and application-specific digital communication functions.\n<\/p>\n<h4>100 MHz Digital Operation<\/h4>\n<p>\nThe NI\u20116581B supports digital waveform operation at rates up to <strong>100 MHz<\/strong> under supported voltage and system configurations.\n<\/p>\n<p>\nThis performance makes the module suitable for high-speed parallel digital buses, digital pattern generation, protocol emulation and electronic device validation.\n<\/p>\n<h4>Programmable Logic Voltage Support<\/h4>\n<p>\nThe NI\u20116581B supports commonly used digital voltage levels, including <strong>1.8 V, 2.5 V and 3.3 V<\/strong>.\n<\/p>\n<p>\nExternal power can also be supplied through the front-panel power connector when the DUT requires a supported externally referenced voltage. According to the device specifications, the external power source range is 1.8 V to 5.5 V, with 5 V operation requiring external power.\n<\/p>\n<p>\nEach digital data connector can be referenced to an internal or external supply, providing additional flexibility when interfacing with devices that use different logic voltage requirements.\n<\/p>\n<h4>Two Global Clock Inputs<\/h4>\n<p>\nThe NI\u20116581B provides two global clock inputs, one on each digital data connector.\n<\/p>\n<p>\nThese clock inputs can connect an external sample clock to the global clock resources of the associated FlexRIO FPGA module for dynamic digital acquisition and synchronized operations.\n<\/p>\n<h4>Clock Output Capability<\/h4>\n<p>\nEach digital data connector includes a clock output terminal that can export a sample clock generated by the FlexRIO FPGA application.\n<\/p>\n<p>\nThis capability can be used to synchronize the connected DUT with FPGA-controlled acquisition or generation.\n<\/p>\n<h4>50 \u03a9 Signal Architecture<\/h4>\n<p>\nThe digital channels use nominal 50 \u03a9 output impedance and 50 \u03a9 characteristic-impedance traces.\n<\/p>\n<p>\nProper cable selection, termination, grounding and signal routing remain important when operating the module at high digital frequencies.\n<\/p>\n<h4>User-Programmable FPGA Processing<\/h4>\n<p>\nThe NI\u20116581B is designed to work with user-programmable FlexRIO FPGA hardware.\n<\/p>\n<p>\nThe FPGA can implement custom digital functions such as:\n<\/p>\n<ul>\n<li>Digital pattern generation<\/li>\n<li>Digital waveform acquisition<\/li>\n<li>Custom triggering<\/li>\n<li>Protocol generation and decoding<\/li>\n<li>Timing and sequencing<\/li>\n<li>Data framing<\/li>\n<li>State machines<\/li>\n<li>Error detection<\/li>\n<li>Real-time decision logic<\/li>\n<li>Data reduction and filtering<\/li>\n<\/ul>\n<h3>Technical Specifications<\/h3>\n<table>\n<tr>\n<th>\u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440<\/th>\n<th>\u0421\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044f<\/th>\n<\/tr>\n<tr>\n<td width=\"280\">Product Type<\/td>\n<td>FlexRIO Digital I\/O Adapter Module<\/td>\n<\/tr>\n<tr>\n<td>\u041c\u043e\u0434\u0435\u043b\u044c<\/td>\n<td>NI\u20116581B<\/td>\n<\/tr>\n<tr>\n<td>Part Number<\/td>\n<td><strong>783887\u201101<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Manufacturer<\/td>\n<td>\u041d\u0430\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0435 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u044b<\/td>\n<\/tr>\n<tr>\n<td>Platform<\/td>\n<td>NI FlexRIO<\/td>\n<\/tr>\n<tr>\n<td>Signaling Type<\/td>\n<td>Single-Ended Digital I\/O<\/td>\n<\/tr>\n<tr>\n<td>Total Digital I\/O Channels<\/td>\n<td><strong>54<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Bidirectional Data Channels<\/td>\n<td><strong>48<\/strong><\/td>\n<\/tr>\n<tr>\n<td>PFI Channels<\/td>\n<td>6 Total, 3 per Connector<\/td>\n<\/tr>\n<tr>\n<td>Data Port Organization<\/td>\n<td>Six 8-Bit Ports<\/td>\n<\/tr>\n<tr>\n<td>Data Channel Direction Control<\/td>\n<td>Configurable per 8-Bit Port<\/td>\n<\/tr>\n<tr>\n<td>Maximum Toggle Rate<\/td>\n<td><strong>100 MHz at \u22653.3 V<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Internal Logic Voltage Levels<\/td>\n<td>1.8 V, 2.5 V and 3.3 V<\/td>\n<\/tr>\n<tr>\n<td>External Power Source Range<\/td>\n<td>1.8 V to 5.5 V<\/td>\n<\/tr>\n<tr>\n<td>Data Channel Output Impedance<\/td>\n<td>50 \u03a9 Nominal<\/td>\n<\/tr>\n<tr>\n<td>Characteristic Impedance<\/td>\n<td>50 \u03a9 Traces<\/td>\n<\/tr>\n<tr>\n<td>Absolute Maximum Input Range<\/td>\n<td>\u22120.5 V to 6.5 V<\/td>\n<\/tr>\n<tr>\n<td>External Global Clock Inputs<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>Clock Outputs<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>Digital Data Connectors<\/td>\n<td>2 \u00d7 68-Pin VHDCI<\/td>\n<\/tr>\n<tr>\n<td>External Power Connector<\/td>\n<td>Spring-Terminal Connector<\/td>\n<\/tr>\n<tr>\n<td>FPGA Compatibility<\/td>\n<td>Compatible NI FlexRIO FPGA Modules and Controllers for FlexRIO<\/td>\n<\/tr>\n<tr>\n<td>Dimensions<\/td>\n<td>12.9 cm \u00d7 2.0 cm \u00d7 12.1 cm<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>284 g<\/td>\n<\/tr>\n<tr>\n<td>Operating Temperature<\/td>\n<td>0\u00b0C to 55\u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Storage Temperature<\/td>\n<td>\u221220\u00b0C to 70\u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Primary Applications<\/td>\n<td>Digital Interface Test, Custom Protocols, Semiconductor Validation and Automated Test<\/td>\n<\/tr>\n<\/table>\n<h3>How Does the NI\u20116581B Work?<\/h3>\n<p>\nThe NI\u20116581B provides the physical single-ended digital interface between a DUT and a compatible NI FlexRIO FPGA.\n<\/p>\n<p>\nA simplified signal path is:\n<\/p>\n<p>\n<strong>Digital DUT \u2194 NI\u20116581B Digital Ports \u2194 FlexRIO FPGA Logic \u2194 DMA \/ PXI Express \u2194 Host Software<\/strong>\n<\/p>\n<p>\nDuring acquisition, incoming digital signals pass through the NI\u20116581B interface and are transferred directly to the associated FPGA. The FPGA can perform deterministic triggering, pattern detection, protocol decoding or data reduction before transferring selected data to the host.\n<\/p>\n<p>\nDuring generation, the FPGA creates digital patterns, timing sequences or protocol frames and sends them through the NI\u20116581B to the connected DUT.\n<\/p>\n<h3>NI\u20116581B Is a FlexRIO Adapter Module<\/h3>\n<p>\nThe NI\u20116581B is an <strong>\u0430\u0434\u0430\u043f\u0442\u0435\u0440\u043d\u044b\u0439 \u043c\u043e\u0434\u0443\u043b\u044c<\/strong> and is not a complete standalone digital instrument.\n<\/p>\n<p>\nA complete NI\u20116581B system normally requires:\n<\/p>\n<ul>\n<li>NI\u20116581B digital I\/O adapter module<\/li>\n<li>Compatible FlexRIO FPGA module or Controller for FlexRIO<\/li>\n<li>Compatible <a href=\"https:\/\/pxisource.com\/ru\/product-category\/%d0%bd%d0%b8\/pxi-%d1%81%d0%b8%d1%81%d1%82%d0%b5%d0%bc%d1%81\/pxi-chassis\/\">PXI or PXIe chassis<\/a> when using a PXI-based FlexRIO module<\/li>\n<li>Compatible <a href=\"https:\/\/pxisource.com\/ru\/product-category\/%d0%bd%d0%b8\/pxi-%d1%81%d0%b8%d1%81%d1%82%d0%b5%d0%bc%d1%81\/pxi-controller\/\">PXI controller<\/a> or host computer<\/li>\n<li>Appropriate VHDCI cables and connection accessories<\/li>\n<li>Compatible NI FlexRIO software<\/li>\n<li>FPGA application or supported instrument design<\/li>\n<\/ul>\n<h3>FlexRIO FPGA Integration<\/h3>\n<p>\nNI FlexRIO combines application-specific adapter modules with programmable FPGA hardware.\n<\/p>\n<p>\nFor the NI\u20116581B, this architecture allows engineers to create custom digital instruments without designing a complete FPGA-connected physical interface from the beginning.\n<\/p>\n<p>\nA typical acquisition architecture is:\n<\/p>\n<p>\n<strong>Digital Input \u2192 NI\u20116581B \u2192 FPGA Triggering and Protocol Processing \u2192 DMA \u2192 Host<\/strong>\n<\/p>\n<p>\nA typical generation architecture is:\n<\/p>\n<p>\n<strong>Host or FPGA Pattern \u2192 FPGA Timing Logic \u2192 NI\u20116581B \u2192 Digital DUT<\/strong>\n<\/p>\n<p>\nThe exact channel behavior, timing architecture, trigger conditions and data processing functions depend on the FPGA design deployed to the compatible FlexRIO hardware.\n<\/p>\n<h3>Digital Port Architecture<\/h3>\n<p>\nThe NI\u20116581B includes two digital data connectors identified as DDCA and DDCB.\n<\/p>\n<p>\nEach connector provides:\n<\/p>\n<ul>\n<li>24 bidirectional data channels organized into three 8-bit ports<\/li>\n<li>Three programmable function interface channels<\/li>\n<li>One global clock input<\/li>\n<li>One clock output<\/li>\n<li>Ground and reserved terminals<\/li>\n<\/ul>\n<p>\nDirection control for the primary data channels is configured per 8-bit port. Engineers should consider the required input and output grouping before assigning DUT signals to the connectors.\n<\/p>\n<h3>Digital Waveform Acquisition<\/h3>\n<p>\nThe NI\u20116581B can capture parallel digital signals and transfer them directly to FPGA logic for deterministic processing.\n<\/p>\n<p>\nPotential acquisition functions include:\n<\/p>\n<ul>\n<li>Digital bus monitoring<\/li>\n<li>Pattern detection<\/li>\n<li>State monitoring<\/li>\n<li>Protocol analysis<\/li>\n<li>Event detection<\/li>\n<li>Timing verification<\/li>\n<li>Device response capture<\/li>\n<li>Trigger-qualified recording<\/li>\n<\/ul>\n<p>\nFPGA processing can reduce the amount of data transferred to the host by identifying events, filtering patterns or extracting only the required information.\n<\/p>\n<h3>Digital Waveform Generation<\/h3>\n<p>\nThe bidirectional architecture allows the NI\u20116581B to generate deterministic digital waveforms and test patterns.\n<\/p>\n<p>\nThe associated FPGA can create application-specific timing and transfer the resulting patterns through the adapter module to the DUT.\n<\/p>\n<p>\nTypical generation applications include:\n<\/p>\n<ul>\n<li>DUT stimulation<\/li>\n<li>Functional testing<\/li>\n<li>Command generation<\/li>\n<li>Protocol emulation<\/li>\n<li>Parallel digital communication<\/li>\n<li>Startup and control sequencing<\/li>\n<li>Automated production testing<\/li>\n<\/ul>\n<h3>Custom Digital Protocols<\/h3>\n<p>\nA major advantage of using the NI\u20116581B with FlexRIO is the ability to implement custom digital protocols in FPGA hardware.\n<\/p>\n<p>\nEngineers can define timing, framing and control behavior according to the requirements of the DUT instead of relying only on fixed instrument protocols.\n<\/p>\n<p>\nCustom protocol functions can include:\n<\/p>\n<ul>\n<li>Clock generation<\/li>\n<li>Command and response sequences<\/li>\n<li>Data framing<\/li>\n<li>Protocol-specific triggering<\/li>\n<li>Pattern recognition<\/li>\n<li>Error detection<\/li>\n<li>Packet processing<\/li>\n<li>Custom state machines<\/li>\n<li>Handshaking<\/li>\n<li>Real-time response generation<\/li>\n<\/ul>\n<h3>Programmable Logic Voltage Levels<\/h3>\n<p>\nThe NI\u20116581B supports common digital voltage levels used by embedded controllers, FPGAs, ASICs and other electronic devices.\n<\/p>\n<p>\nInternal supply options support 1.8 V, 2.5 V and 3.3 V operation. External voltage can be supplied separately to the two connector banks when required by a compatible DUT interface.\n<\/p>\n<p>\nBefore connecting the module, verify:\n<\/p>\n<ul>\n<li>DUT logic voltage<\/li>\n<li>Input high and input low thresholds<\/li>\n<li>Required output voltage levels<\/li>\n<li>External power polarity<\/li>\n<li>Maximum drive current<\/li>\n<li>Total power dissipation<\/li>\n<li>Channel direction configuration<\/li>\n<\/ul>\n<p>\nSignals that exceed the documented input or output limits can damage the adapter module or associated FlexRIO hardware.\n<\/p>\n<h3>Clocking and Synchronization<\/h3>\n<p>\nHigh-speed digital acquisition and generation require stable clocking and controlled timing.\n<\/p>\n<p>\nThe NI\u20116581B provides two global clock inputs that route external sample clocks to the FlexRIO FPGA global clock resources. It also provides clock outputs for exporting FPGA-generated sample clocks.\n<\/p>\n<p>\nThese clock resources can support:\n<\/p>\n<ul>\n<li>Source-synchronous digital acquisition<\/li>\n<li>Synchronized waveform generation<\/li>\n<li>DUT clock distribution<\/li>\n<li>Multi-port timing coordination<\/li>\n<li>External clock-based protocol operation<\/li>\n<li>Deterministic FPGA timing<\/li>\n<\/ul>\n<h3>Custom FPGA Triggering<\/h3>\n<p>\nTraditional digital instruments generally provide a predefined set of trigger conditions. With the NI\u20116581B and FlexRIO, trigger logic can be implemented directly in FPGA hardware.\n<\/p>\n<p>\nPossible FPGA trigger functions include:\n<\/p>\n<ul>\n<li>Digital edge trigger<\/li>\n<li>Multi-channel pattern trigger<\/li>\n<li>Sequence trigger<\/li>\n<li>Protocol-specific trigger<\/li>\n<li>Timing-qualified trigger<\/li>\n<li>Event-count trigger<\/li>\n<li>Conditional trigger<\/li>\n<li>Application-specific trigger state machine<\/li>\n<\/ul>\n<h3>Deterministic Digital Processing<\/h3>\n<p>\nFPGA processing allows digital decisions to be performed directly in hardware without transferring every sample to a desktop operating system first.\n<\/p>\n<p>\n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:\n<\/p>\n<p>\n<strong>Digital Input \u2192 FPGA Pattern Detection \u2192 Immediate Output Response<\/strong>\n<\/p>\n<p>\nThis architecture is useful for applications that require predictable timing, low-latency responses or continuous digital monitoring.\n<\/p>\n<h3>Semiconductor Test Applications<\/h3>\n<p>\nThe NI\u20116581B can be used for semiconductor and electronic device validation when the DUT uses a compatible single-ended digital interface.\n<\/p>\n<p>\nPotential applications include:\n<\/p>\n<ul>\n<li>IC functional testing<\/li>\n<li>FPGA validation<\/li>\n<li>ASIC validation<\/li>\n<li>Digital interface characterization<\/li>\n<li>Prototype device testing<\/li>\n<li>Command and response verification<\/li>\n<li>Production test development<\/li>\n<li>Device communication testing<\/li>\n<\/ul>\n<h3>FPGA and ASIC Validation<\/h3>\n<p>\nFPGA and ASIC devices often contain application-specific digital interfaces that cannot be tested efficiently with fixed-function instruments.\n<\/p>\n<p>\nThe NI\u20116581B can be paired with FlexRIO FPGA hardware to generate custom stimulus, capture responses and implement DUT-specific verification logic.\n<\/p>\n<p>\nTesting functions can include:\n<\/p>\n<ul>\n<li>Pattern generation<\/li>\n<li>Pattern comparison<\/li>\n<li>Interface verification<\/li>\n<li>Timing validation<\/li>\n<li>Error detection<\/li>\n<li>Register communication<\/li>\n<li>Functional testing<\/li>\n<\/ul>\n<h3>Automated Test Applications<\/h3>\n<p>\nThe NI\u20116581B can be integrated into automated test systems that require programmable digital DUT interfaces.\n<\/p>\n<p>\nA typical automated test sequence may include:\n<\/p>\n<ol>\n<li>Initialize the FlexRIO system.<\/li>\n<li>Load the required FPGA design.<\/li>\n<li>Configure the NI\u20116581B voltage reference.<\/li>\n<li>Set the direction of each 8-bit data port.<\/li>\n<li>Configure clock and trigger conditions.<\/li>\n<li>Generate the required digital stimulus.<\/li>\n<li>Capture the DUT response.<\/li>\n<li>Process or compare the data in FPGA hardware.<\/li>\n<li>Transfer results to the host application.<\/li>\n<li>Record the measurement and pass\/fail status.<\/li>\n<\/ol>\n<h3>Hardware-in-the-Loop Testing<\/h3>\n<p>\nThe deterministic FPGA architecture makes the NI\u20116581B suitable for selected hardware-in-the-loop applications requiring compatible single-ended digital interfaces.\n<\/p>\n<p>\nThe module can generate simulated digital states, monitor DUT outputs and provide low-latency responses based on programmed FPGA logic.\n<\/p>\n<h3>Production Test<\/h3>\n<p>\nIn a production test system, the NI\u20116581B can provide repeatable digital stimulus and response analysis for compatible electronic devices.\n<\/p>\n<p>\nFPGA hardware can manage time-critical pattern generation and evaluation while the host application handles test sequencing, operator interaction, data logging and reporting.\n<\/p>\n<h3>Signal Integrity Considerations<\/h3>\n<p>\nAt high digital frequencies, the electrical design of the complete signal path can affect test accuracy and reliability.\n<\/p>\n<p>\nBefore connecting the NI\u20116581B to a DUT, consider:\n<\/p>\n<ul>\n<li>Logic voltage compatibility<\/li>\n<li>Cable impedance<\/li>\n<li>Cable length<\/li>\n<li>Connector pinout<\/li>\n<li>Grounding<\/li>\n<li>Termination<\/li>\n<li>Clock quality<\/li>\n<li>Signal reflections<\/li>\n<li>Channel-to-channel skew<\/li>\n<li>Output loading<\/li>\n<\/ul>\n<p>\nUsing appropriate 50 \u03a9 signal paths and short, well-controlled cables can help maintain signal quality in high-speed applications.\n<\/p>\n<h3>System Integration Considerations<\/h3>\n<p>\nBefore selecting the NI\u20116581B, verify the complete system and DUT requirements.\n<\/p>\n<ul>\n<li>Required number of digital channels<\/li>\n<li>Required input and output port grouping<\/li>\n<li>Maximum digital clock rate<\/li>\n<li>DUT logic voltage levels<\/li>\n<li>Internal or external voltage reference requirements<\/li>\n<li>Required clock inputs and outputs<\/li>\n<li>Connector and cable requirements<\/li>\n<li>Compatible FlexRIO FPGA hardware<\/li>\n<li>Required FPGA resources<\/li>\n<li>PXI or PXIe chassis compatibility<\/li>\n<li>Host communication bandwidth<\/li>\n<li>NI FlexRIO driver compatibility<\/li>\n<li>LabVIEW and FPGA development environment<\/li>\n<\/ul>\n<h3>Troubleshooting NI\u20116581B Systems<\/h3>\n<p>\nIf an NI\u20116581B system does not acquire or generate digital signals correctly, check the complete hardware, software and FPGA configuration.\n<\/p>\n<ol>\n<li>Confirm that the NI\u20116581B is securely connected to compatible FlexRIO hardware.<\/li>\n<li>Verify that the FlexRIO device is detected by the system.<\/li>\n<li>Confirm that a compatible NI FlexRIO driver is installed.<\/li>\n<li>Check the FPGA bitfile and adapter interface configuration.<\/li>\n<li>Verify the direction setting for each 8-bit data port.<\/li>\n<li>Confirm the selected internal or external voltage reference.<\/li>\n<li>Check DUT logic levels against the module specifications.<\/li>\n<li>Verify the VHDCI connector pinout and cable wiring.<\/li>\n<li>Check external clock frequency and signal quality.<\/li>\n<li>Verify FPGA trigger conditions.<\/li>\n<li>Check grounding, termination and cable impedance.<\/li>\n<li>Confirm DMA and host data-transfer configuration.<\/li>\n<\/ol>\n<h3>How to Choose a FlexRIO Digital I\/O Adapter Module<\/h3>\n<p>\nBefore purchasing a FlexRIO digital adapter module, determine:\n<\/p>\n<ul>\n<li>Required digital channel count<\/li>\n<li>Single-ended or differential signaling requirements<\/li>\n<li>Required logic voltage levels<\/li>\n<li>Maximum clock and data rate<\/li>\n<li>Input, output or bidirectional operation<\/li>\n<li>Port-level direction-control requirements<\/li>\n<li>Custom protocol requirements<\/li>\n<li>Triggering and synchronization requirements<\/li>\n<li>Compatible FlexRIO FPGA module<\/li>\n<li>Required FPGA processing resources<\/li>\n<li>Connector and cabling requirements<\/li>\n<li>Software and driver compatibility<\/li>\n<\/ul>\n<h3>Industries<\/h3>\n<ul>\n<li>\u0422\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u043e\u043b\u0443\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u0438\u043a\u043e\u0432<\/li>\n<li>Electronic Design Validation<\/li>\n<li>Automated Test Equipment<\/li>\n<li>Electronics Manufacturing<\/li>\n<li>\u0410\u044d\u0440\u043e\u043a\u043e\u0441\u043c\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0438 \u043e\u0431\u043e\u0440\u043e\u043d\u043d\u0430\u044f \u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u043e\u0441\u0442\u044c<\/li>\n<li>Embedded Systems<\/li>\n<li>Industrial Electronics<\/li>\n<li>Scientific Research<\/li>\n<li>Research and Development<\/li>\n<\/ul>\n<h3>Applications<\/h3>\n<h4>High-Speed Digital Acquisition<\/h4>\n<p>\nThe NI\u20116581B can acquire high-speed single-ended digital signals and transfer them directly to programmable FPGA logic for deterministic processing.\n<\/p>\n<h4>Digital Pattern Generation<\/h4>\n<p>\nFPGA-generated patterns can be transmitted through the NI\u20116581B to stimulate and test connected digital devices.\n<\/p>\n<h4>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432<\/h4>\n<p>\nEngineers can implement application-specific timing, framing, triggering and communication state machines in the associated FlexRIO FPGA.\n<\/p>\n<h4>FPGA and ASIC Validation<\/h4>\n<p>\nThe module can generate stimulus patterns and capture responses from compatible FPGA, ASIC and other digital interfaces.\n<\/p>\n<h4>Hardware-in-the-Loop Testing<\/h4>\n<p>\nDeterministic FPGA processing allows the module to participate in compatible digital HIL systems requiring predictable input and output timing.\n<\/p>\n<h4>Automated Production Test<\/h4>\n<p>\nThe NI\u20116581B can provide repeatable digital stimulus, response acquisition and FPGA-based pass\/fail processing within automated production systems.\n<\/p>\n<h3>NI\u20116581B vs NI\u20116581<\/h3>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>NI\u20116581B<\/th>\n<th>NI\u20116581<\/th>\n<\/tr>\n<tr>\n<td>Digital I\/O Channels<\/td>\n<td>54 Single-Ended Channels<\/td>\n<td>54 Single-Ended Channels<\/td>\n<\/tr>\n<tr>\n<td>Bidirectional Data Channels<\/td>\n<td>48<\/td>\n<td>48<\/td>\n<\/tr>\n<tr>\n<td>Maximum Toggle Rate<\/td>\n<td>100 MHz at Supported Voltage<\/td>\n<td>100 MHz at Supported Voltage<\/td>\n<\/tr>\n<tr>\n<td>Electrical Interface<\/td>\n<td>Single-Ended<\/td>\n<td>Single-Ended<\/td>\n<\/tr>\n<tr>\n<td>FlexRIO Compatibility<\/td>\n<td><strong>Broader FlexRIO FPGA Module Compatibility<\/strong><\/td>\n<td>Limited Primarily to PXI\u2011795xR and PXIe\u2011796xR FPGA Modules<\/td>\n<\/tr>\n<tr>\n<td>Recommended Use<\/td>\n<td>Newer or Mixed-Generation FlexRIO Systems<\/td>\n<td>Selected Legacy FlexRIO Systems<\/td>\n<\/tr>\n<\/table>\n<p>\nThe main difference is FlexRIO hardware compatibility. The NI\u20116581B is the more flexible choice when building or maintaining a system that may use later-generation FlexRIO FPGA hardware.\n<\/p>\n<h3>NI\u20116581B vs Differential Digital I\/O Modules<\/h3>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>NI\u20116581B<\/th>\n<th>Differential Digital Adapter<\/th>\n<\/tr>\n<tr>\n<td>Signaling Type<\/td>\n<td><strong>Single-Ended<\/strong><\/td>\n<td>Differential<\/td>\n<\/tr>\n<tr>\n<td>Channel Density<\/td>\n<td>54 Digital I\/O Channels<\/td>\n<td>Model Dependent<\/td>\n<\/tr>\n<tr>\n<td>Noise Immunity<\/td>\n<td>Application and Wiring Dependent<\/td>\n<td>Generally Higher<\/td>\n<\/tr>\n<tr>\n<td>\u0422\u0438\u043f\u0438\u0447\u043d\u043e\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435<\/td>\n<td>TTL-Level Parallel Digital Interfaces<\/td>\n<td>LVDS, RS-422 or Other Differential Interfaces<\/td>\n<\/tr>\n<tr>\n<td>Selection Basis<\/td>\n<td>DUT Requires Compatible Single-Ended I\/O<\/td>\n<td>DUT Requires Differential Signaling<\/td>\n<\/tr>\n<\/table>\n<p>\nThe correct module should be selected according to the DUT electrical interface. A differential adapter module is not a direct substitute when the connected device requires single-ended TTL-level signaling.\n<\/p>\n<h3>NI\u20116581B and Compatible FlexRIO Hardware<\/h3>\n<p>\nThe NI\u20116581B must be paired with compatible NI FlexRIO FPGA hardware or a Controller for FlexRIO.\n<\/p>\n<p>\nCompatible FlexRIO system families can provide:\n<\/p>\n<ul>\n<li>User-programmable FPGA resources<\/li>\n<li>Onboard memory on selected modules<\/li>\n<li>PXI Express host communication<\/li>\n<li>DMA data transfer<\/li>\n<li>PXI\/PXIe timing and triggering<\/li>\n<li>Real-time digital processing<\/li>\n<\/ul>\n<p>\nAlways verify the exact adapter module, FPGA module, controller and driver combination before purchasing or upgrading a system.\n<\/p>\n<h3>Software and Driver Requirements<\/h3>\n<p>\nThe NI\u20116581B requires a compatible NI FlexRIO software environment.\n<\/p>\n<p>\nThe current NI FlexRIO driver supports modular FlexRIO systems, including PXI FPGA Modules for FlexRIO and FlexRIO adapter modules. Software compatibility depends on the selected FPGA hardware, operating system, LabVIEW version and FlexRIO driver version.\n<\/p>\n<p>\nBefore installation, verify:\n<\/p>\n<ul>\n<li>Supported NI FlexRIO driver version<\/li>\n<li>Compatible LabVIEW development environment<\/li>\n<li>LabVIEW FPGA requirements<\/li>\n<li>Operating system compatibility<\/li>\n<li>FPGA module support<\/li>\n<li>Adapter module support<\/li>\n<li>Required example projects or interface resources<\/li>\n<\/ul>\n<h3>Recommended Related Products<\/h3>\n<table>\n<tr>\n<td width=\"220\"><strong>NI\u20116581<\/strong><\/td>\n<td>Earlier 100 MHz, 54-channel single-ended FlexRIO digital I\/O adapter for selected legacy FPGA modules.<\/td>\n<\/tr>\n<tr>\n<td><strong>NI\u20116583<\/strong><\/td>\n<td>High-speed FlexRIO digital adapter module for applications requiring different electrical interface capabilities.<\/td>\n<\/tr>\n<tr>\n<td><strong>NI\u20116584<\/strong><\/td>\n<td>FlexRIO digital adapter module designed for high-speed digital test and custom FPGA-based applications.<\/td>\n<\/tr>\n<tr>\n<td><strong>PXIe\u20117975R<\/strong><\/td>\n<td>FlexRIO FPGA module with user-programmable FPGA resources for custom digital instrumentation.<\/td>\n<\/tr>\n<tr>\n<td><strong>PXIe\u20117976R<\/strong><\/td>\n<td>High-performance FlexRIO FPGA module for demanding real-time processing and digital test systems.<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pxisource.com\/ru\/product-category\/%d0%bd%d0%b8\/pxi-%d1%81%d0%b8%d1%81%d1%82%d0%b5%d0%bc%d1%81\/%d0%bc%d0%be%d0%b4%d1%83%d0%bb%d0%b8-pxi\/\"><strong>NI PXI and PXIe Modules<\/strong><\/a><\/td>\n<td>Modular instruments for data acquisition, digital test, RF measurement and automated validation systems.<\/td>\n<\/tr>\n<\/table>\n<h3>Why Choose NI\u20116581B?<\/h3>\n<ul>\n<li>54 single-ended digital I\/O channels<\/li>\n<li>48 bidirectional data channels<\/li>\n<li>Six programmable function interface channels<\/li>\n<li>100 MHz digital operation<\/li>\n<li>Support for common 1.8 V, 2.5 V and 3.3 V logic levels<\/li>\n<li>Externally referenced voltage support<\/li>\n<li>Two global clock inputs<\/li>\n<li>Two clock outputs<\/li>\n<li>Port-based direction control<\/li>\n<li>User-programmable FPGA processing<\/li>\n<li>Custom digital protocol implementation<\/li>\n<li>Deterministic triggering and response logic<\/li>\n<li>Digital acquisition and waveform generation<\/li>\n<li>Suitable for FPGA and ASIC validation<\/li>\n<li>Suitable for semiconductor and automated test<\/li>\n<li>Broad FlexRIO FPGA platform compatibility<\/li>\n<\/ul>\n<h3>Frequently Asked Questions<\/h3>\n<h4>What is the NI\u20116581B?<\/h4>\n<p>\nThe NI\u20116581B is a <strong>100 MHz, 54-channel single-ended digital I\/O adapter module for NI FlexRIO<\/strong>. It is used with compatible FlexRIO FPGA hardware to create a programmable digital instrument.\n<\/p>\n<h4>What is the part number for the NI\u20116581B?<\/h4>\n<p>\nThe standard National Instruments part number for the NI\u20116581B is <strong>783887\u201101<\/strong>.\n<\/p>\n<h4>How many digital channels does the NI\u20116581B provide?<\/h4>\n<p>\nThe NI\u20116581B provides 54 single-ended digital I\/O channels, including 48 bidirectional data channels and six PFI channels.\n<\/p>\n<h4>What is the maximum digital rate of the NI\u20116581B?<\/h4>\n<p>\nThe module supports a maximum toggle rate of 100 MHz at supported voltage levels and operating conditions.\n<\/p>\n<h4>Are the NI\u20116581B channels bidirectional?<\/h4>\n<p>\nThe 48 main data channels are bidirectional. Their direction is configured by 8-bit port rather than independently for every data channel.\n<\/p>\n<h4>Which logic voltage levels does the NI\u20116581B support?<\/h4>\n<p>\nThe module supports internal 1.8 V, 2.5 V and 3.3 V logic supplies. Supported externally powered operation is also available for compatible DUT voltage requirements.\n<\/p>\n<h4>Does the NI\u20116581B support 5 V digital signals?<\/h4>\n<p>\nThe device specifications include 5 V acquisition and generation levels when an appropriate external power source is used. The external supply, signal limits and total power dissipation must be verified before connecting a 5 V interface.\n<\/p>\n<h4>Is the NI\u20116581B a standalone digital instrument?<\/h4>\n<p>\nNo. It is a FlexRIO adapter module and requires a compatible FlexRIO FPGA module or Controller for FlexRIO.\n<\/p>\n<h4>Can the NI\u20116581B generate digital patterns?<\/h4>\n<p>\nYes. A compatible FPGA application can generate deterministic digital patterns and transmit them through the NI\u20116581B to a connected DUT.\n<\/p>\n<h4>Can the NI\u20116581B acquire digital signals?<\/h4>\n<p>\nYes. It can acquire single-ended digital signals and transfer them to FPGA logic for triggering, pattern detection, protocol processing or host transfer.\n<\/p>\n<h4>Can the NI\u20116581B implement custom protocols?<\/h4>\n<p>\nYes. Engineers can implement custom timing, framing, state machines, triggers and protocol logic in the associated FlexRIO FPGA.\n<\/p>\n<h4>Does the NI\u20116581B support LVDS?<\/h4>\n<p>\nNo. The NI\u20116581B is a single-ended digital I\/O adapter. Applications requiring LVDS or another differential standard should use a compatible differential digital adapter module.\n<\/p>\n<h4>What is the difference between NI\u20116581B and NI\u20116581?<\/h4>\n<p>\nBoth models provide similar 100 MHz single-ended digital I\/O functionality. The main difference is that the NI\u20116581B supports a broader range of FlexRIO FPGA hardware, while the earlier NI\u20116581 is limited primarily to selected PXI\u2011795xR and PXIe\u2011796xR modules.\n<\/p>\n<h4>Can the NI\u20116581B be used with LabVIEW FPGA?<\/h4>\n<p>\nYes. The module is designed for programmable FlexRIO applications and can be used with a compatible LabVIEW FPGA and NI FlexRIO software environment.\n<\/p>\n<h4>What connectors does the NI\u20116581B use?<\/h4>\n<p>\nThe module provides two 68-pin VHDCI digital data connectors and a spring-terminal connector for external power.\n<\/p>\n<h4>What should I check before purchasing the NI\u20116581B?<\/h4>\n<p>\nVerify the DUT channel count, single-ended signaling requirements, logic voltage levels, port direction requirements, clock rate, connector and cable configuration, compatible FlexRIO FPGA module, PXI\/PXIe chassis, controller, software version and exact NI part number.\n<\/p>\n<h3>\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>NI\u20116581B 100 MHz, 54-Channel Single-Ended Digital I\/O Adapter Module for FlexRIO<\/strong> provides a programmable interface for digital acquisition, pattern generation, custom protocols and deterministic FPGA processing. Its 48 bidirectional data channels, six PFI channels, configurable logic supplies, global clock resources and broad FlexRIO compatibility make it suitable for semiconductor validation, FPGA and ASIC testing, embedded interface development, automated production test and custom digital instrumentation.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u041a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0434\u0432\u0443\u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043a\u0430\u043d\u0430\u043b\u043e\u0432: 54<br \/>\n\u0414\u0443\u043f\u043b\u0435\u043a\u0441: \u2013<br \/>\n\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u0430\u044f \u0442\u0430\u043a\u0442\u043e\u0432\u0430\u044f \u0447\u0430\u0441\u0442\u043e\u0442\u0430: 10 \u041c\u0413\u0446<br \/>\n\u041b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0443\u0440\u043e\u0432\u043d\u0438 \u0438 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d: 1,8 \u0412, 2,5 \u0412, 3,3 \u0412<br \/>\n\u0421\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u044b\u0439 FPGA: Kintex-7, Virtex-5<br \/>\n\u0426\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u0432\u0432\u043e\u0434\/\u0432\u044b\u0432\u043e\u0434: terminatsiya 5 \u041e\u043c<br \/>\n\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u0430\u044f \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u0434\u0430\u043d\u043d\u044b\u0445: 10 \u041c\u0431\u0438\u0442\/\u0441<br \/>\n\u0422\u0438\u043f \u0441\u0438\u0433\u043d\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438: \u041e\u0434\u043d\u043e\u043f\u043e\u043b\u044e\u0441\u043d\u044b\u0439<\/p>","protected":false},"featured_media":31003,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[667],"product_tag":[],"class_list":["post-30605","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-pxi-modules","first","instock","shipping-taxable","purchasable","product-type-simple"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NI-6581B Digital I\/O Adapter Module for FlexRIO 783887-01, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"The NI\u20116581B is a 100 MHz, 54-channel single-ended digital I\/O adapter module for NI FlexRIO systems. 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