Fwd: Input requested concerning change to trigger L0 timing.

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From: W.J. Llope (llope_at_physics.rice.edu)
Date: Thu Jan 23 2003 - 13:12:55 EST

see below - let's discuss and i'll reply to christie later
this afternoon - thanks

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>Date: Thu, 23 Jan 2003 13:06:00 -0500
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>From: "Bill Christie" <christie_at_bnl.gov>
>X-HN-Forum: STAR Operations
>Subject: Input requested concerning change to trigger L0 timing.
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>Dear Sub System managers,
> It appears that in order to get the BEMC trigger data properly lined
>up with the trigger data from the other STAR trigger detectors (i.e.
>CTB, BBC, and ZDC) that we'll have to insert a one "STAR clock tick"
>delay into the trigger timing. Note: One "STAR clock tick" is ~ 107 ns.
>This will change the time between when the collision happens, and when
>trigger sends out the L0 trigger to the subsystems, from the 13 clock
>ticks that were used last year to 14 clock ticks.
> We plan to test this scheme soon. I'd like to hear back from sub
>system managers any concerns that they may have about this change, and
>in particular, if this change will necessitate a change to your sub
>systems setup (logic, delays, NIM setup, etc.) to account for this
>change. Please get back to me on this ASAP.
> Greetings from frigid Long Island,
> Bill
>
>
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-- 

  W.J. Llope, Ph.D.                      Res. Assoc. Professor
  T.W. Bonner Nuclear Laboratory         phone:  713-348-4741
  Rice University, MS-315                fax:    713-348-5215
  6100 S. Main St.                  
  Houston, TX 77005-1892            
             e-mail:     llope_at_physics.rice.edu
             WWW home:   http://wjllope.rice.edu/default.html

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