[Halld-level1] FCAL DAQ meeting tomorrow

[Alexander Somov]

Hi all,

I see three ways how we can implement the
LED pulser. They are listed below based on
the complexity level. I am in favor of option b),
though a) is the simplest.

a) EPICS controlled V1495 will generate triggers.
   External triggers will be sent to 2 master TIs
   and the TS (very easy to implement).

b) V1495 generates triggers and sends:
   2 external triggers to the master TIs (for the
   stand alone data taking ) and an
   external trigger to the  LVDC input of one of
   CTPs for the global trigger distribution.
   The CTP will code the LED trigger using one bit
   in the message send to the SSP. The trigger
   distribution is similar to the BCAL cosmic trigger.
   Based on Hai, the CTP implementation is trivial.
   He is going to implement it as he is already
   working on the bcal cosmic.

c) The TS will generate led triggers. V1495 will receive
   an external trigger from one of TIs. The implementation
   will require more efforts. Trigger for the readout cannot
   be delayed (according to William) on the TI. Likely, we'll
   need to send two triggers of different types from the TS:
   one to fire the led and another to initiate the readout. The
   master TI firmware will also require some modification.

Cheers,
       Alex



On Mon, 24 Feb 2014, Elton Smith wrote:

> Hi all,
>
> I spoke to Hovanes after the meeting regarding the use of the V1495 as a
> fan-out for an external signal. It appears this mode has been
> anticipated and it uses the G0 connector to input the external trigger.
> Individual pulser signals follow the input if they are enabled using the
> A_PULSER_GIN_MASK register. We need to think this through in detail, but
> it seems like it will work for us
>
> Cheers, Elton.
>
> Elton Smith
> Jefferson Lab MS 12H5
> 12000 Jefferson Ave STE 16
> Newport News, VA 23606
> (757) 269-7625
> (757) 269-6331 fax
>
> On 2/23/14 7:22 PM, John Leckey wrote:
>> Hi All,
>>
>> We will continue the FCAL DAQ meetings tomorrow (Monday) at 10:00 in 326.
>>
>> John
>>
>>
>> https://halldweb1.jlab.org/wiki/index.php/FCAl_DAQ_Meetings
>>
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