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

[Alexander Somov]

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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