Nav:  [[HCALFrontEnd]]

'''2017-02-10'''

There are 39 ohm series R on BKP-JTAG-TCK on the control board (R2).  Replace with larger value, certainly improves signal integrity.  See eLog:  [http://cmsonline.cern.ch/cms-elog/966892 966892].  Tullio suggests further work, see [http://joule.bu.edu/~hazen/CMS/HCAL_FE/JTAG_Email_11Feb2017.txt eMails].


schematics:
* HBHE ngCCM: https://cms-docdb.cern.ch/cgi-bin/DocDB/ShowDocument?docid=13096
* HBHE backplane: https://cms-docdb.cern.ch/cgi-bin/DocDB/ShowDocument?docid=12784
* HBHE QIE card: https://cms-docdb.cern.ch/cgi-bin/DocDB/ShowDocument?docid=12782 (pag2 B2 you can see the 0ohm resistors Joe was pointing to)
* https://indico.cern.ch/event/507473/ Useful PRR talks

svn repository:
* ngFEC: https://svnweb.cern.ch/trac/cms-firmwsrc/browser/hcal/HCAL_ngFEC_fc7/trunk
* ngCCM: https://svnweb.cern.ch/trac/cms-firmwsrc/browser/hcal/HBHE_ngCCM
* https://svnweb.cern.ch/trac/cms-firmwsrc/browser/hcal/HF_ngCCM/igloo2_UMD_mezz