VLDB+ control toolkit manual

Note

This user’s guide contains information for the VLDB+ control toolkit including the hardware and software specifications.

The Low-Power Gigabit Transceiver (LpGBT) is a radiation tolerant ASIC for multipurpose high-speed bidirectional optical links in HEP experiments. Its data interface to the detectors’ frontends is highly configurable supporting multiple data rates. The LpGBT is designed to be used for data acquisition as well as for trigger and timing distribution. It also features control interfaces and environmental monitoring functions to implement experiment control.

Therefore, this device contains a huge register map to be configured and to be monitored in real-time.

The previous GBTx component configuration was made using a JAVA application and a custom USB to I2C dongle designed at CERN.

Nevertheless, that implied some limitations:

• No remote control
• Static interface
• Custom electronics
• OS compatibility
• No GPIOs available

For these reasons, the LpGBT control toolkit based on Raspberry Pi was selected as the best candidate to be the new programmer system called PiGBT.

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• 1. Introduction
  • 1.1. Control toolkit
  • 1.2. PiGBT application
  • 1.3. User interface
• 2. Quick start
  • 2.1. Starting Raspberry Pi
  • 2.2. Connecting PiGBT
    • 2.2.1. Connect to PiGBT Wi-Fi
    • 2.2.2. Connect to PiGBT Wired network
    • 2.2.3. Raspberry Pi standalone setup
• 3. Navigating PiGBT
  • 3.1. Getting started
    • 3.1.1. Load the LpGBT minimal configuration
  • 3.2. LpGBT mode
    • 3.2.1. Transceiver configuration
    • 3.2.2. Transmitter configuration
  • 3.3. Elink groups
  • 3.4. Clocks
    • 3.4.1. Phase shifter clocks
    • 3.4.2. eLink clocks
  • 3.5. High-speed links
    • 3.5.1. Line driver
    • 3.5.2. Equalizer
    • 3.5.3. Perform Eye-Diagram measurement
  • 3.6. Test features
    • 3.6.1. Uplink data path test pattern
    • 3.6.2. Downlink data path test pattern
    • 3.6.3. Bert checker
  • 3.7. I2C Master
  • 3.8. GPIO
  • 3.9. Analog peripherals
    • 3.9.1. Voltage Digital to Analog Converter
    • 3.9.2. Current Digital to Analog Converter
    • 3.9.3. Analog to Digital Converter
  • 3.10. Test outputs
  • 3.11. Registers
    • 3.11.1. Save data to a file
    • 3.11.2. Fetch data from a file
    • 3.11.3. Fuse registers
  • 3.12. Connection
    • 3.12.1. Cascaded lpGBT(s)
• 4. Example features
  • 4.1. Clocks evaluation
  • 4.2. PLL performance evaluation
  • 4.3. Transceiver configuration
  • 4.4. Transmitter configuration
  • 4.5. Analog peripherals configuration
  • 4.6. Evaluation of high-speed uplink
  • 4.7. Evaluation of high-speed downlink
  • 4.8. Access to raw values of registers
• 5. PiGBT updates
  • 5.1. How to update
  • 5.2. PiGBT version history
• 6. FAQ
  • 6.1. How do I reinstall Raspberry OS on my SD card?
  • 6.2. How do I troubleshoot piGBT as a result of a software update?
  • 6.3. How to find my Raspberry Pi IP address (no OLED) ?
  • 6.4. How to read back the commands sent to lpGBT using the piGBT web interface ?
• 7. Version History

Indices and tables

• Index
• Module Index
• Search Page