View source for Digital BCM Meeting, 2021 March 24

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== Meeting information ==
  '''Meeting time:'''  4:00pm Eastern
  
  We'll be using this LBNL zoom link for the meeting:  https://lbnl.zoom.us/j/95645100291

== Agenda ==
*  Discussion of options and tradeoffs of how TI connection is made to the VCU108
*  General discussion

== Minutes ==
Participants:  R. Michaels, B. Moffit, W. Gu, S. Li, E. Sichtermann, Y. Kolomensky, Y. Mei, A. Cuda

*  Discussing how to make the TI connection
**  William and Yuan discuss the TI_FMC schematic.  William thinks the trigger signal will be what carries the start of the helicity gate
**  In the CODA system, the sync/reset is used to zero the clock counter.  This is how the timestamps are generated.
**  The four lines on the QSFP are:
***  RX/TX1:  Trigger; 1.25GHz
***  RX/TX2:  Clock; 250 MHz
***  RX/TX3:  Sync; 250 MHz, Manchester encoded
***  RX/TX4:  Fiber loopback; 250 MHz, Manchester encoded.  This is used to measure the cable length, but we could do without it by measuring the cable connection by hand.
**  The GPIO connector on the VCU108 ought to be able to handle the 250 MHz signals, but couldn't support the 1.25GHz trigger signal.
**  The "Samtec Bullseye" connector on the VCU108 can handle the 1.25GHz signal
*  New development plan
**  Yuan will develop an interface board which will connect to the Bullseye and the GPIO connectors, and this would then be able to support all TI functionality
**  Since the TI QSFP connection will be done on the new interface board, we would have the option of using the VCU108 QSFP for the data connection