2-Slot Crate Debugging Procedures

Introduction

The 2-slot crate located at Andrew's bench gives probing access and measurements otherwise inaccessible inside the ATCA crate.  Common uses of the 2-slot crate include checking voltages, attenuator bits, and amplifier/switch debugging. 

Connection Diagram

• FPGA Port 0 ↔ Port 3 on CPU-B084-SP01

Using the 2-slot debug crate

Start the software:

• log in to lcls-dev3
• ssh laci@cpu-b084-sp01
• ping 10.0.0.101 (Check connection)
• In bash:
  • . /afs/slac.stanford.edu/g/lcls/vol9/package/cpsw/framework/R4.4.2/env.slac.sh
  • rssi_bridge -a 10.0.0.101 -p8193 -p8194

Open the UI

• • open a new lcls-dev3 window
  • cd /afs/slac/g/lcls/package/cpsw/cpswTreeGUI/current/
  • ./env.slac.sh
  • python3 cpswTreeGUI.py --ipAddress=10.0.0.101 --rssiBridge=cpu-b084-sp01 --disableStreams ~disco/scripts/B084_TestStand/stripline_yaml/AmcCarrierBpmStriplineDDV1_project.yaml/000TopLevel.yaml NetIODev&

    • Or ~disco/scripts/bash/ControlGUI.sh
  • Under the mmio tab "right mouse" click "load file" <default.yaml>

GUI Guide (once connection is made the GUI should not show ??? in the value fields):

Turn on Calibration: 

Pulse generation steps:

• mmio
  
  • AppTop
    • AppCore
      • AmcBpmCore
        • StripCalCtrl
          • AttnCal - set to 0x14
          • Cal_CALMode - Red or Green
          • Cal_ContTrig - OneShot
          • Cal_EnaTrig - Enabled (will reset after each shot)
          • Cal_OSCMode (On)
          • SoftTrig - (input 0x1 and enter will generate only 1 cal tone for 100us, and need to reset after each shot)
            • !! - By hitting enter, a large power pulse will be generated by the amplifier.  Make sure termination and attenuation are in place before doing this. 

Amplifier Check: 

• Turn resistor R30 side-ways: 
  • 
• Connect SMA-Pin hole connector to oscilloscope, add series termination pad of minimum 20dB to scope
• Set probe/OSC to 50 ohm termination
• Connect J105 to probe
• Set time base to max. 20us per division
• Set vertical scale to 50mV per division
• Set trigger around 50mV
• Set AttnCal in mmio GUI to 0x14 (20dB attenuation)
• Follow pulse generation steps above to create signal
• Observe signal on the screen.  Reference good signal shown below (at J105): 
• 
• If RF switches are working, and cables from J102 to J101, J104 to J103 are attached, green and red channels will look like:
•  

Set Attenuation: 

• mmio
  
  • AppTop
    • AppCore
      • AmcBpmCore
        • StripCalCtrl
          • AttnA/B[x]  - set value in hex

Attenuation Truth Table: