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

[David Lawrence]

Cool beans!

-Dave

On 1/23/12 2:29 PM, Hovanes Egiyan wrote:
> Hi Dave,
> There will be scalers that will be available for monitoring
> programs. These registers will be written and readout independent
> of CODA DAQ. This info is going to be available in EPICS for general
> purpose monitoring.
> Whenever there is a need, we will have EPICS IOC running on the VXS
> crates CPU.
> At least that is the plan.
> Hovanes.
>
> On 01/23/2012 01:32 PM, David Lawrence wrote:
>> 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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