Difference: AMC13DebugLog (55 vs. 56)

Revision 5614 Jun 2013 - EricHazen

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META TOPICPARENT name="CmsSlhc"
Please log AMC13 test activity below, blog style (new entries at top)
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  • Update TTT firmware and tested range of TTT SN 2: Found similar results as 2013-06-13 entry. AMC13 clock stops working at somewhere between 80 and 90 MHz. Lock lost at around 120 MHz.

  • Continuing Clock Phase Shift testing:
Changed:
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<
    • Placed probe in clock path prior to the m-LVDS (will add specifics soon) on SN 33
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    • Placed probe in clock path prior to the m-LVDS (T2 board -- U25 input @ R18) on SN 33
 
    • Observed a unexpected phase behavior when changing amplitude of AWG:
      • Shifting from 900mV peak to peak to 600mV cause the signals (AWG and probe) to go out of phase and stay there even after returning to 900mV. (delay of roughly 9.58 ns)
      • Shifting back down to 600 mV puts it back in phase again. (delay of roughly 3.38 ns)
Line: 17 to 17
 
Changed:
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  • Also started testing probe in between clock and data separator
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  • Moved probe to output of SFP receiver for TTC input (two vias next to U2 on T1).
  • Repeat power-cycle tests
 

2013-06-13 dickens

  • AMC13XG and TTT frequency range tests:
Line: 42 to 43
 
    • Using Agellant AWG 40 MHz 900mV peak to peak output as external clock
    • AWG connect by 2 ft onto T on channel 4 of oscilloscope (LeCroy 725 ZI 2.5 GHz)
    • 4ft long cable from T to external clock to TTT
Changed:
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    • D310 differential probe soldered to FClkA on AMC13 at backplane connector w/ 100 ohm between the pair
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    • D310 differential probe soldered to FClkA on receiver AMC13 at backplane connector w/ 100 ohm between the pair
 
    • AMC13 receiving clock is in slot 8 (SN 43)
    • SN 40 in AMC13 with 4ft duplex fiber to B chann of TTT

 
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