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

[Elton Smith]

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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