NI PXI-6653 User Manual
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NI PXI-6653 User Manual

Timing and synchronization module for pxi
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NI PXI-6653 User Manual
Timing and Synchronization Module for PXI
NI PXI-6653 User Manual
January 2003 Edition
Part Number 323388A-01

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  • Page 1 NI PXI-6653 User Manual Timing and Synchronization Module for PXI NI PXI-6653 User Manual January 2003 Edition Part Number 323388A-01...
  • Page 2 Switzerland 41 56 200 51 51, Taiwan 886 2 2528 7227, United Kingdom 44 0 1635 523545 For further support information, refer to the Technical Support and Professional Services appendix. To comment on the documentation, send email to techpubs@ni.com. © 2003 National Instruments Corporation. All rights reserved.
  • Page 3 Warranty The NI PXI-6653 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period.
  • Page 4 These classes are known as Class A (for use in industrial-commercial locations only) or Class B (for use in residential or commercial locations). All NI products are FCC Class A products. Depending on where it is operated, this Class A product could be subject to restrictions in the FCC rules. (In Canada, the Department of Communications (DOC), of Industry Canada, regulates wireless interference in much the same way.) Digital...

  • Page 5: Table Of Contents

    PXI_CLK10 and OCXO ................3-8 Routing Signals......................3-9 Determining Sources and Destinations ............3-11 Using Front Panel PFIs As Inputs.............3-12 Using Front Panel PFIs As Outputs ..........3-12 Using the PXI/RTSI Triggers ............3-13 Using the PXI Star Triggers..............3-14 © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 6 Factory Calibration ......................4-1 OCXO Frequency ................... 4-1 PXI_CLK10 Phase..................4-1 DDS Start Trigger Phase................. 4-1 DDS Initial Phase.................... 4-2 User Calibration......................4-2 Appendix A Specifications Appendix B Technical Support and Professional Services Glossary Index NI PXI-6653 User Manual ni.com...

  • Page 7: About This Manual

    Thank you for purchasing the National Instruments PXI-6653 (NI 6653) Timing and Synchronization Module. The NI 6653 enables you to pass PXI timing and trigger signals between two or more PXI chassis. The NI 6653 can generate and route clock signals between devices in multiple chassis, providing a method to synchronize multiple devices in a multichassis PXI system.

  • Page 8: National Instruments Documentation

    1997, and is now managed by the PXIbus Systems Alliance. National Instruments Documentation The NI PXI-6653 User Manual is one piece of the documentation set for your measurement system. You could have any of several other documents describing your hardware and software. Use the documentation you have as follows: •...

  • Page 9: Related Documentation

    PXI Specification, Revision 2.0, available from www.pxisa.org • NI-VISA User Manual, available from ni.com/manuals • VISA Help, available from ni.com/manuals • Getting Started with Multi-Chassis Synchronization Using the NI PXI-6653 and NI PXI-4472, available from ni.com/manuals © National Instruments Corporation NI PXI-6653 User Manual...

  • Page 10: Introduction

    PXI embedded controller or a desktop computer connected to the PXI chassis using MXI-3 hardware If you are using the NI 6653 in a system to synchronize NI PXI-4472 modules, you can refer to Getting Started with Multichassis Synchronization Using the NI PXI-6653 and the NI PXI-4472, which you can download from ni.com/manuals...

  • Page 11: Unpacking

    Chapter 1 Introduction Unpacking The NI 6653 is shipped in an antistatic package to prevent electrostatic damage to the module. Electrostatic discharge (ESD) can damage several components on the module. Caution Never touch the exposed pins of connectors. To avoid such damage in handling the module, take the following precautions: •...

  • Page 12: Safety Information

    Avoid contact between your body and the connector block signal when hot swapping modules. Remove power from signal lines before connecting them to or disconnecting them from the product. © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 13 Working voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation. MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may be connected to the MAINS for measuring purposes. NI PXI-6653 User Manual ni.com...

  • Page 14: Installing And Configuring

    NI PXI-6653 readme.htm Driver and Examples CD for directions on software installation. Be sure to install the driver software before installing the NI 6653 hardware. Note Installing the Hardware The following are general installation instructions. Consult the chassis user manual or technical reference manual for specific instructions and warnings about installing new modules.

  • Page 15: Configuring The Module

    Chapter 2 Installing and Configuring Configuring the Module The NI 6653 is completely software configurable. The system software automatically allocates all module resources, including base memory address and interrupt level. The two LEDs on the front panel provide information about module status.

  • Page 16: Hardware Overview

    Hardware Overview This chapter presents an overview of the hardware functions of the NI 6653. Figure 3-1 provides a functional overview of the NI 6653 hardware. © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 17 PXI_CLK10_IN AC Coupled CLKIN Clock Detector OCXO OCXO Calibration OCXO PXI_CLK10 Clock CLKOUT Functionality not supported with Version 1.0 of the NI PXI-6653 driver software. DDS Clock Driver/ PXI_STAR<0..12> PFI 0 Comparator CLOCK and TRIGGER Driver/ PFI 1 PXI_TRIG<0..7> Comparator Routing PFI<0..1>...

  • Page 18: Ni 6653 Front Panel

    PFI 1 PFI 2 PFI 3 PFI 4 PFI 5 1 Access LED 4 CLKIN Connector 2 Active LED 5 PFI <0..5> Connectors 3 CLKOUT Connector Figure 3-2. NI 6653 Front Panel © National Instruments Corporation NI PXI-6653 User Manual...

  • Page 19: Access Led

    This feature is not supported in version 1.0 of the NI 6653 Driver Software. NI PXI-6653 User Manual ni.com...

  • Page 20: Connectors

    — — — — — This feature is not supported in version 1.0 of the NI 6653 Driver Software Note A red Active LED can indicate that either PXI_CLK10 has stopped or that there is a PLL error. Connectors This section describes the connectors on the front panel of the NI 6653.

  • Page 21: Hardware Features

    Hardware Overview Connections that exceed any of the maximum ratings of input or output signals Caution on the NI PXI-6653 can damage the module and the computer. NI is not liable for any damage resulting from such signal connections. Hardware Features The NI 6653 performs two broad functions: •...

  • Page 22: Clock Generation

    However, PXI_TRIG<6..7> are not identical to RTSI<6..7>. This feature is not supported in version 1.0 of the NI 6653 Driver Software. The remainder of this chapter describes how these signals are used, acquired, and generated by the NI 6653 hardware, and explains how you can route the signals between various locations to synchronize multiple measurement devices and PXI chassis.

  • Page 23: Direct Digital Synthesis (Dds)

    A resistive heater and automatic feedback circuit maintain a precisely controlled operating temperature for the oscillator. This temperature-control scheme minimizes frequency error. This feature is not supported in version 1.0 of the NI 6653 Driver Software. NI PXI-6653 User Manual ni.com...

  • Page 24: Routing Signals

    Chapter 3 Hardware Overview An NI 6653 module located in Slot 2 of a PXI chassis can replace the native PXI 10 MHz backplane frequency reference clock (PXI_CLK10) with the more stable and accurate output of the OCXO. All other PXI modules in the chassis that reference the 10 MHz backplane clock benefit from this more accurate frequency reference.
  • Page 25 SYNCHRONIZATION CLOCKS for PXI_STAR<0..12> and PXI_TRIG<0..7> ÷2 PXI_CLK10 ÷2 Figure 3-3. High-Level Schematic of NI 6653 Signal Routing Architecture Figure 3-4 provides a more detailed view of the Selection Circuitry referenced in Figure 3-3. PFI<0..5> PXI_TRIG<0..7> PXI_STAR<0..12> Software Trigger CLK/N CLK/M Figure 3-4.

  • Page 26: Determining Sources And Destinations

    Table 3-4 summarizes the sources and destinations of the NI 6653. The destinations are listed in the horizontal heading row, and the sources are listed in the column at the far left. A ✓ in a cell indicates that the source and destination combination defined by that cell is a valid routing combination.

  • Page 27: Using Front Panel Pfis As Inputs

    Terminating the signals with a 50 Ω resistance is recommended when the source is Note another NI 6653 or any other source with a 50 Ω output. The voltage thresholds for the front-panel PFI inputs are programmable. The input signal is generated by comparing the input voltage on the PFI connectors to the voltage output of software-programmable DACs.

  • Page 28: Using The Pxi/Rtsi Triggers

    You can independently select the output signal source for each PXI/RTSI trigger line from one of the following sources: • PFI <0..5> • Another PXI/RTSI trigger <0..7> (PXI_TRIG<0..7>) • PXI_STAR <0..12> • Global software trigger • Backplane synchronization clock © National Instruments Corporation 3-13 NI PXI-6653 User Manual...

  • Page 29: Using The Pxi Star Triggers

    PXI/RTSI triggers <0..7> (PXI_TRIG<0..7>) • Another PXI star trigger line (PXI_STAR <0..12>) • Global software trigger • Backplane synchronization clock Refer to the Using the PXI/RTSI Triggers section for more information on the backplane synchronization clock. NI PXI-6653 User Manual 3-14 ni.com...

  • Page 30: Choosing The Type Of Routing

    Chapter 3 Hardware Overview Choosing the Type of Routing The NI 6653 routes signals in one of two ways: asynchronously or synchronously. The following sections describe the two routing types and the considerations for choosing each type. Asynchronous Routing Asynchronous routing is the most straightforward method of routing signals.

  • Page 31: Synchronous Routing

    Chapter 3 Hardware Overview Both the source and the destination of an asynchronous routing operation on the NI 6653 can be any of the following lines: • Any front panel PFI pin (PFI <0..5) • Any PXI star trigger line (PXI_STAR<0..12>) •...
  • Page 32 NI 6653 includes two clock-divider circuits that can divide the synchronization clock signals by any power of 2 up to 512. Refer to the Figures 3-3 and 3-4 for an illustration of how the NI 6653 performs synchronous routing operations.

  • Page 33: Generating A Single Pulse (Global Softwaretrigger)

    As long as the incoming signal is a stable 1 MHz frequency multiple, the PLL circuit quickly locks the OCXO to the reference, eliminating all phase drift between the two signals. The PXI_CLK10 PLL is not supported with version 1.0 of the NI 6653 Driver Software. NI PXI-6653 User Manual 3-18...
  • Page 34 If CLKIN stops or becomes disconnected, PXI_CLK10 is still present in the chassis. • If CLKIN is 10 MHz, the NI 6653 can compensate for distribution delays in the backplane. The feedback in the PLL comes from PXI_CLK10. This PLL makes it possible for the NI 6653 to align clock edges at CLKIN with the edges of PXI_CLK10 that the modules receive.

  • Page 35: Calibration

    (EEPROM). The driver software uses these stored values. Factory Calibration The factory calibration of the NI 6653 involves calculating and storing four calibration constants. These values control the accuracy of four features of the device, which are discussed in the following sections.

  • Page 36: Dds Initial Phase

    The phase of the DDS output is adjusted using this constant so that the DDS outputs from multiple NI 6653 modules are aligned. User Calibration User calibration of the NI 6653 is currently not supported. Refer to for additional information on NI ni.com/calibration...

  • Page 37: Appendix A Specifications

    Stresses beyond those listed can cause permanent damage to the device. Exposure to absolute maximum rated conditions for extended periods of time can affect device reliability. Functional operation of the device outside the conditions indicated in the operational parts of the specification is not implied. © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 38 The lower limit is load dependent because of the AC coupling. This limit is less than 1 MHz for high-impedance loads. With an external 50 Ω splitter. This value does not include cable attenuation or splitter insertion loss. NI PXI-6653 User Manual ni.com...
  • Page 39 Stresses beyond those listed can cause permanent damage to the device. Exposure to absolute maximum rated conditions for extended periods of time can affect device reliability. Functional operation of the device outside the conditions indicated in the operational parts of the specifications is not implied. Relative to PXI_CLK10. © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 40 ........10 ns CtoQ Output-to-output skew, synchronous..500 ps PXI_STAR Trigger Characteristics PXI_STAR<0..12> to PXI_STAR<0..12> output skew at NI 6653 backplane connector .....400 ps Asynchronous delays, t PXI_STAR<0..12> to PFI <0..5> output......7.5 to 13 ns PXI_STAR<0..12> to PXI_TRIG<0..7> output....13 to 19 ns...
  • Page 41 Includes temperature stability of OCXO and supporting circuitry. The DDS frequency inherits the relative frequency of PXI_CLK10. For example, if you route the OCXO to PXI_CLK10, the DDS output inherits the same relative frequency accuracy as the OCXO output. © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 42 Humidity ..........10 to 95% RH, noncondensing Maximum altitude........2,000 meters Pollution Degree (indoor use only) ..2 Safety The NI PXI-6653 meets the requirements of the following standards for safety and electrical equipment for measurement, control, and laboratory use: • IEC 61010-1, EN 61010-1 •...
  • Page 43 Select the appropriate product family, followed by your product, and a link to the DoC appears in Adobe Acrobat format. Click the Acrobat icon to download or read the DoC. © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 44 • System Integration—If you have time constraints, limited in-house technical resources, or other project challenges, NI Alliance Program members can help. To learn more, call your local NI office or visit ni.com/alliance • Declaration of Conformity (DoC)—A DoC is our claim of compliance with the Council of the European Communities using the manufacturer’s declaration of conformity.
  • Page 45 NI corporate headquarters. Phone numbers for our worldwide offices are listed at the front of this manual. You also can visit the Worldwide Offices section of to access the branch ni.com/niglobal...
  • Page 46 Ω accumulator a part where numbers are totaled or stored application development environment asynchronous a property of an event that occurs at an arbitrary time, without synchronization to a reference clock © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 47 RTSI/PXI triggers or synchronization clock PXI_STAR triggers on an NI 6653 the group of conductors that interconnect individual circuitry in a computer. Typically, a bus is the expansion vehicle to which I/O or other devices are connected.
  • Page 48 © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 49 Intel to replace ISA and EISA. It is achieving widespread acceptance as a standard for PCs and work-stations; it offers a theoretical maximum transfer rate of 132 Mbytes/s. Programmable Function Interface NI PXI-6653 User Manual ni.com...
  • Page 50 PXI backplane for high-accuracy device synchronization with minimal latencies on each PXI slot RTSI bus Real-Time System Integration bus—the NI timing bus that connects DAQ devices directly, by means of connectors on top of the devices, for precise synchronization of functions...
  • Page 51 CtoQ hold time hold propagation delay time TRIG trigger signal trigger a digital signal that starts or times a hardware event (e.g. starting a data acquisition operation) setup time setup volts virtual instrument NI PXI-6653 User Manual ni.com...
  • Page 52 3-14 education, B-1 using the PXI/RTSI triggers, 3-13 professional services, B-1 block diagram technical support, B-1 NI 6653 functional overview, 3-2 routing architecture, 3-10 signal selection circuitry, 3-10 clock generation, 3-8 DDS clock cable configuration, 3-12 backplane synchronization clock, 3-14...
  • Page 53 (tip), 3-8 DDS, 3-8 overview, 3-7 PXI_CLK10 and OCXO, 3-8 generating a single pulse (trigger), 3-18 KnowledgeBase, B-1 getting started configuring the device, 2-2 equipment, 1-1 installing the hardware, 2-1 installing the software, 2-1 NI PXI-6653 User Manual ni.com...
  • Page 54 (table), 3-6 front panel triggers as outputs, 3-12 using the PXI_CLK10 PLL, 3-18 routing to the CLKOUT connector, 3-5 overview, 3-8 using front panel PFIs as outputs, 3-13 specifications, A-5 © National Instruments Corporation NI PXI-6653 User Manual...
  • Page 55 PXI trigger characteristics, A-4 generating a single pulse (trigger), 3-18 PXI_STAR trigger characteristics, A-4 overview, 3-9 star triggers. See PXI_STAR<0..12> possible sources and destinations support (table), 3-11 technical, B-1 PXI star triggers, 3-14 RTSI/PXI triggers, 3-13 NI PXI-6653 User Manual ni.com...
  • Page 56 B-1 voltage thresholds, programming, 3-12 technical support, B-1 telephone technical support, B-2 professional services, B-1 terminating signals with resistors (note), 3-12 technical support, B-1 threshold, voltage, 3-12 worldwide technical support, B-2 © National Instruments Corporation NI PXI-6653 User Manual...

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