[Halld-level1] FCAL DAQ meeting tomorrow

[Chris Cuevas]

Hi,

I agree that your option b is the best choice and eliminates running 
cable from the FCAL to the trigger rack(TS).

Good to hear that the implementation for using the new input on the 
front panel of the CTP will not be difficult and it should not matter 
which one of the CTP is used for transmitting the V1495 generated 
trigger because the SSP will decode the bit from the message link.

Regards,
-Chris
~~~~~~~~~~~~~~~

On 2/24/2014 2:03 PM, Alexander Somov wrote:
> 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
>>>
>>> _______________________________________________
>>> Halld-level1 mailing list
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