[Halld-level1] Data stream scalers, summary of the meeting

[David Lawrence]

Hi Sasha,

   Are they counting even when the DAQ system is not currently taking 
data? I would think we would want an out-of-band way of getting at the 
scalers. That way, we can display them at any time (e.g. while tuning 
the beam in between runs). Maybe you mentioned something about this 
before...?

-Dave

On 1/23/12 1:25 PM, Alexander Somov wrote:
> Hi Elton,
>
> A good point.
>
> You don't need to disentangle the whole events.
> Scalers will have a tag in the fadc event block;
> one will need to search for the corresponding tags
> only; should be straight forward.
>
> Cheers,
>          Sasha
>
>
>
> On Mon, 23 Jan 2012, Elton Smith wrote:
>
>> Hi Sasha,
>>
>> Thanks for the summary. In mode a) can easily scan through a file and
>> pick out the events with scalers (without disentangling the whole event)?
>>
>> Elton Smith
>> Jefferson Lab MS 12H5
>> 12000 Jefferson Ave
>> Suite #16
>> Newport News, VA 23606
>> (757) 269-7625
>> (757) 269-6331 fax
>>
>>
>> On 1/23/12 9:10 AM, Alexander Somov wrote:
>>> Hi,
>>>
>>> I brief summary of the data stream scaler
>>> implementation  discussion last Friday
>>> (Jan 20th, 2012):
>>>
>>> 1. Scalers will be integrated into the data readout
>>> block of each FADC; they will be readout using DMA.
>>>
>>> 2. There are two ways of the implementation:
>>>      a) scalers will be added to the last event in
>>>         the block. A user needs to specify the block
>>>         prescaling factor, i.e., the number of blocks
>>>         after which the scalers should be added
>>>         (for instance, add scalers in each 10000's readout
>>>         blocks).
>>>      b) Scaler readout will be handled by the special
>>>         trigger type generated by the TS (the trig2 line
>>>         going from the TI to the fadc can, for instance, be
>>>         used for the scaler trigger distribution). Similar
>>>         to a), scalers will be added to the readout block.
>>>         Implementing this mode will require more efforts.
>>>
>>> 3. Edd and Bryan will start implementing mode a).
>>>
>>>
>>> Cheers,
>>>          Alex
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