Re: wfd status report

Chris Walter (walter@cithe502.cithep.caltech.edu)
Wed, 21 Jul 1993 12:13:22 -0800 (PDT)

Thanks for the information Ed. Here is a question regarding this section of
your message(possibly Younan could answer it better):

>
> Speaking of the VIC interface, we have requested that Giorgio Giacomelli
> purchase these to repay some money owed to the MACRO/USA group. We have
> not yet heard if the order has been placed. The DAQ group (Ronga et al)
> has been installing and testing their end of the system recently.
> Younan Lu has spent some time working with them and has learned about
> how the system will work. We have two strategies for interfacing with
> this system. The one that I believe will be implemented first is to
> modify the VME readout software to read the wfd information in an
> intelligent way that uses the timeword information to only record the
> information for a specified time window. I have written routines for my
> test DAQ and the overhead of the extra calculations is not large (25%)
> and the transfer rate is still quite high (> 4 Mb/sec). The next step
> (due for my trip in August) is to translate them from C to EPASCAL for
> VAXELN. The second strategy is to have in-crate computers do this
> processing and provide the daq with structured data, but I feel that
> this will require considerable development time to learn how to pass the
> required control information back and forth.

I was wondering how we read CAMAC information(for example the
registers in the LIP which tell you which boxes were hit, or the Time
words in the stop master) and then use this information to make decisions
about what WFD channels and buckets to read in the VME system using
the so called VME lists.

-Chris