PPS Analyzer

PPF proved
UPA

NetTimeLogic developed a PPS analyzer specifically for (PTP) Plugfests where multiple devices are synchronizing each other, and the accuracy of the individual devices shall be measured via PPS (offset from reference PPS). The device has 8 PPS inputs that are measured simultaneously, and it synchronizes itself to an additional reference PPS input. Additionally, it has a PPS output of the synchronized clock which is used for PPS measurement. Multiple PPS Analyzers can be connected to the same host and are all discovered automatically. It uses a serial interface (mostly over USB) or Ethernet to access the registers in the FPGA. In the FPGA it uses NetTimeLogic's configuration IP (free of charge) which represents an AXI Master to the other IP cores. It uses a proprietary protocol to convert the serial data stream from/to AXI register access. The core part consists of the following NetTimeLogic IP cores: PPS Slave IP core, PPS Master IP core, Adjustable Counter Clock IP core and multiple instances of the Signal Timestamper IP core. The tool needs no configuration and self-discovers all cores available in the design. It allows to access all registers in the design (also third party) which are connected to the AXI bus.

It allows to save the measurement screen as JPG, PNG or TIFF and can log the measured values as CSV.

The application is written with Qt as GUI framework and is currently available for Windows. The measured offsets are read by the PPS Analyzer application via UART and shown in a chart.


Block Diagram

PPS Analyzer

Hardware

The hardware used for the PPS Analyzer consists of a custom PPS shield for the ArtyA7-35T board from Digilent

PPS Shield

PPS Analyzer shield from NetTimeLogic on a Digilent Arty A7-35T

Screenshots

PPS Screen

Grey: Reference PPS, Colored: PPS from devices under test

PPS Config

This is the screen to change the individual delays in case cable delays differ or if some aditional buffers are in place

This is the screen to set threshold values which will be signaled on additional pins if exceeded and indicated in the GUI

This is a saved screen (you can save the current screens as PNG, TIFF or BMP) from the swiss PTP Plugfest 2017

Features

  • 8 PPS inputs per analyzer
  • 1 reference PPS input per analyzer
  • 1 PPS output per analyzer
  • Synchronized Clock via PPS
  • Timestamp resolution 4ns
  • UART or Ethernet connection
  • Multi Analyzer and Multi User capable
  • PPS compensated for synchronization error introduced by the reference PPS
  • Multiple Analyzers supported (in the same Screen)
  • Individual Delay compensation per PPS
  • Enable and disable individual PPS
  • Renaming of PPS signals
  • Optional EEPROM for Buffer delay compensations and storage of IP and MAC
  • Optional Threshold configuration and signals to alarm when the offset exceeds the defined range
  • Auto scale or fixed scale
  • Longterm measurements (up to 100000 seconds with sliding screen window)
  • Self-discovery of all Analyzers
  • Save screen as PNG, TIFF or BMP
  • Log values as CSV
  • Python Script for measurements from a script or custom measurements

Pricing

All prices are in US Dollars without VAT and shipping costs. The prices are without the ArtyA7-35T board from Digilent, this has to be purchased individually:

  • Do-It-Yourself (DIY) PPS Analyser Shield Kit:                    
    • Contains the PCB and components as loose parts for self-assembly/soldering
    • All parts are through-hole components
    • Uncalibrated

100$ (plus shipping)

  • Pre-Assembled and calibrated PPS Analyser Shield Kit:
    • Ready to run PPS Analyzer Shield, fully assembled and calibrated

265$ (plus shipping)

All prices are non-binding estimates – please use the contact form for definitive pricing and lead-time information (normaly we have some pre-assembled and calibrated PPS Analyzers on stock)

build your own

If you want to build your own (without calibration possibility), we are happy to give you the required information how to build your own PPS shield (or you buy our DIY Kit) and we will provide the GUI software, a bitstream, and EAGLE(R) schematics, layout and BOM files (HW files provided by Christian Voit, not the same as our shield) for the ArtyA7-35T board => contact us to get free access to the download page

Downloads

GitHub

The whole project can be found as sources on NetTimeLogic's Github account:

https://github.com/NetTimeLogic/UniversalPpsAnalyzer

Get involved

Contact us if you would like to contribute to the development of this open source project

Upa_UniversalPpsAnalyzer_ReferenceManual.pdf Upa_UniversalPpsAnalyzer_ReferenceManual.pdf
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