GT Readout Platform: Testing and Bring-Up

Resistance measurements with cable attached

• Cable was produced in-house, see TIDIDECS-114 - Getting issue details... STATUS
• There are no serial number on the cables, so for now only using one and assigning it "Cable 01"
• Measuring between banana connector on the cable and test points on the board

Resistance measurements with analog and digital boards mated

Measuring on test points on the analog board.

Voltage measurements with analog and digital boards mated

• FPGA is not programmed.
• All power rails are not powered up yet on the digital board, see Issue #3.
• All power rails on the analog board are disabled by default due to the pull-down resistor R21.

Simplified virtual I/O gateware for the FPGA

Only digital board

• Before programming the FPGA
  • Current consumption: 327 mA at 24 V on P24V0D
  • Temperature: Stable at around 28C with fan blowing on the bottom of the board (not FPGA side)
• After programming the FPGA
  • Current consumption: 336 mA at 24 V on P24V0D
  • Temperature: Stable at around 29C with fan blowing on the bottom of the board (not FPGA side)
• Virtual IO
  • prsntAnalogL and prsntCarrierL both are high indicating no boards are plugged in
  • hwRev is correct: 0b0001
  • hardwareIo[7:4] works

Digital and analog board

• After programming the FPGA
  • Current consumption: 338 mA at 24 V on P24V0D
  • Temperature stable at around 32C now due to analog board in the way of the airflow to the digital board
• prsntAnalogL is now low indicating that the analog board is plugged on
• Toggling pwrEnable HIGH should turn on all the power supplies on the analog board
  • This includes supplies on the P24V0A power rail also so this must be provided from the external supply
  • Toggling the pwrEnable HIGH
  • Current consumption:
    • 440 mA at 24 V on P24V0D
    • 47 mA at 24 V on P24V0A
  • Probing on analog board:
    • P5V0A FIRST = 4.978 V
    • P5V0D FIRST = 5.013 V
    • P1V8A FIRST = 1.816 V
    • P1V8D FIRST = 1.803 V
    • P1V8D = 0.494 V
    • P3V3D = 0 V
    • P3V3A = 0 V
    • P1V8A = 0 V
    • P2V5 AVDD = 0 V
    • P2V5A SINK = 0 V
    • P0V8 DC BIAS = 0 V
  • → Something is not working on the analog board and the power sequencing!
    • Issue identified, see Issue #1
    • Gave all three analog boards to the workshop on 2024-04-26 for rework

Digital, analog and carrier board

• prsntCarrierL is now low indicating that the carrier board is plugged on