National Instruments PXIe-6672 User Manual

Timing and synchronization module for pxi express

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User manual (57 pages)

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USER MANUAL

PXIe-6672

Timing and Synchronization Module for PXI Express

The PXIe-6672 can generate and route clock and trigger signals between devices in a single

chassis or multiple chassis, providing a method to synchronize multiple devices in a PXI

Express system.

This manual describes the electrical and mechanical aspects of the PXIe-6672 and contains

information concerning its operation and programming.

Conventions

Caution

avoid injury, data loss, or a system crash. When this symbol is marked on the

product, refer to the

take.

National Instruments Documentation

The PXIe-6672 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:

•

Measurement hardware documentation—This documentation contains detailed

information about the measurement hardware that plugs into or is connected to the

computer. Use this documentation for hardware installation and configuration

instructions, specifications about the measurement hardware, and application hints.

•

Software documentation—Refer to the NI-Sync Help, available at

You can download NI documentation from

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Summary of Contents for National Instruments PXIe-6672

Page 1 USER MANUAL PXIe-6672 Timing and Synchronization Module for PXI Express The PXIe-6672 can generate and route clock and trigger signals between devices in a single chassis or multiple chassis, providing a method to synchronize multiple devices in a PXI Express system.
Page 2: Table Of Contents
WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS..27 Introduction The PXIe-6672 can generate and route clock and trigger signals between devices in a single chassis or multiple chassis, providing a method to synchronize multiple devices in a PXI Express system.
Page 3: Unpacking
Do not operate the product in a manner not specified in this document. Misuse of the product can result in a hazard. You can compromise the safety protection built into the product if the product is damaged in any way. If the product is damaged, return it to National Instruments for repair.
Page 4 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 hardware. Suitably rated measuring circuits may be connected to the MAINS for measuring purposes. 4 | ni.com | PXIe-6672 User Manual...
Page 5: Installing And Configuring
Power off and unplug the chassis. Choose an available slot in the chassis. The PXIe-6672 can be installed in a System Timing Slot (marked by either a square glyph shown in Figure 1.
Page 6: Configuring The Module
Remove any packing material from the front panel screws and backplane connectors. Insert the PXIe-6672 into the PXI Express slot. Use the injector/ejector handle to fully insert the module into the chassis. Screw the front panel of the device to the front panel mounting rail of the chassis.
Page 8: Pxie-6672 Front Panel
4. CLKIN Connector 2. Active LED 5. PFI<0..5> Connectors 3. CLKOUT Connector Access LED The Access LED indicates the communication status of the PXIe-6672. Table 1. Access LED Color Indication Color Status Module is not yet functional. Green Driver has initialized the module.
Page 9 Amber User-defined PXI_CLK10 has stopped, or there is a PLL error Connectors This section describes the connectors on the front panel of the PXIe-6672. • CLKIN—AC-coupled, 50 Ω clock input. CLKIN can be programmatically routed to: – Directly to PXI_CLK10_IN for distribution to other modules in the chassis.
Page 10: Hardware Features
This signal is the PXI 10 MHz backplane clock. By default, this signal is the output of the native 10 MHz oscillator in the chassis. A PXIe-6672 in the System Timing Slot can replace this signal with PXI_CLK10_IN. TCXO Clock This is the output of the 10 MHz TCXO.
Page 11: Clock Generation And Routing
PXI chassis. Clock Generation and Routing The PXIe-6672 can generate two types of clock signals. The first type of clock is generated using the onboard DDS chip, and the second is generated with a precise 10 MHz oscillator.
Page 12 The PLL circuitry controls the frequency of the TCXO by varying the tuning voltage used for electronic frequency control. By increasing or decreasing the frequency of the TCXO as needed, the 10 MHz PLL of the PXIe-6672 is able to match the TCXO frequency to the reference clock supplied by the user from CLKIN.
Page 13: Routing Triggers
Use of the 10 MHz PLL of the PXIe-6672 has advantages over using just CLKIN or the TCXO to drive PXI_CLK10_IN: • Reference frequencies other than 10 MHz can be used. The 10 MHz PLL includes internal dividers to divide both the reference from CLKIN and PXI_CLK10 down as needed in order to make both a common frequency.
Page 14 Figure 4. High-Level Schematic of PXIe-6672 Signal Routing Architecture Selection PXI_STAR<0..16>, Selection PFI 0 PXI_STAR 0 Circuitry PXI_TRIG<0..7>, Circuitry SOURCE PFI<0..5>, and Software Trigger are Selection Selection PFI 1 PXI_STAR 1 CLKIN routed to SOURCE Circuitry Circuitry of each Selection Circuitry block.
Page 15 Terminating the signals with a 50 Ω impedance is recommended when the source is another PXIe-6672 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 16 The multi-drop nature of the PXI trigger bus can introduce signal integrity issues. Therefore, National Instruments does not recommend the use of the PXI_TRIG lines for clock distribution. The preferred method for clock distribution is the use of the PXI_Star triggers.
Page 17 Another PXI star trigger line (PXI_STAR <0..16>) • Global software trigger • PXI_Trig/PXI_Star synchronization clock • CLKIN Refer to the Using the PXI Triggers section for more information on the PXI_Trig/PXI_Star synchronization clock. PXIe-6672 User Manual | © National Instruments | 17...
Page 18 Propagation delay of the signal through the PXIe-6672. • Time for the receiver to recognize the signal. Both the source and the destination of an asynchronous routing operation on the PXIe-6672 can be any of the following lines: • Any front panel PFI pin (PFI<0..5>) as single ended.
Page 19 CtoQ Trigger Output The PXIe-6672 board supports routing signals synchronous to either the rising or falling edge of the synchronization clock. In addition, the polarity of the destination signal can be inverted, which is useful when handling active-low digital signals. Synchronous routing can be useful for eliminating skew when sending triggers to several destinations.
Page 20 For more information and possible methods to ensure this requirement is met, go to and enter the Info Code ni.com/info SyncTriggerRouting Possible sources for synchronous routing with the PXIe-6672 include the following sources: • Any front panel PFI pin. • Any PXI star trigger line (PXI_STAR<0..16>) •...
Page 21: Calibration
This chapter discusses the calibration of the PXIe-6672. Calibration consists of verifying the measurement accuracy of a device and correcting for any measurement error. The PXIe-6672 is factory calibrated before shipment at 23 ±5 °C to the levels indicated in the device's specifications. The associated calibration constants—the corrections that were needed to meet specifications—are stored in the onboard nonvolatile...
Page 22: Additional Information
To obtain the DoC for this product, visit ni.com/ , search by model number or product line, and click the appropriate link in the certification Certification column. 22 | ni.com | PXIe-6672 User Manual...
Page 23: Electromagnetic Compatibility Information
Changes or modifications not expressly approved by National Instruments could void the user's right to operate the hardware under the local regulatory rules. Electromagnetic Compatibility Information...
Page 24: Limited Warranty
SOLE REMEDIES, AND SHALL APPLY EVEN IF SUCH REMEDIES FAIL OF THEIR ESSENTIAL PURPOSE. EXCEPT AS EXPRESSLY SET FORTH HEREIN, PRODUCTS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND AND NI DISCLAIMS ALL WARRANTIES, 24 | ni.com | PXIe-6672 User Manual...
Page 25: Copyright
National Instruments Corporation. National Instruments respects the intellectual property of others, and we ask our users to do the same. NI software is protected by copyright and other intellectual property laws. Where NI...
Page 26: Trademarks
Bluetooth SIG, Inc. ™ The ExpressCard word mark and logos are owned by PCMCIA and any use of such marks by National Instruments is under license. 26 | ni.com | PXIe-6672 User Manual...
Page 27: Patents
Instruments Patent Notice at ni.com/patents. Export Compliance Information Refer to the Export Compliance Information at ni.com/legal/export-compliance the National Instruments global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data. WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS...
Page 28 For patents covering NI products/technology, refer to the appropriate location: Help»Patents in your software, the file on your media, or the National Instruments Patent Notice patents.txt . You can find information about end-user license agreements (EULAs) and third-party legal notices ni.com/patents...