[Halld-online] F1 TDC trig_time ?

[Richard Jones]

David,

I remember using this word for something when I was decoding the tdc
information for the tagger. Isn't it a mod-512 count that somehow defines
which sub-region of the 16-bit time range that the trigger occurred in? It
has been too long now, but I seem to remember that I thought it was useful
for something.

-Richard Jones

On Wed, Aug 19, 2015 at 10:34 AM, David Lawrence <davidl at jlab.org> wrote:

>
> Hi Offliners,
>
>   Does anyone know if the “trig_time” member of the DF1TDCHit objects is
> being used
> anywhere? This is a 9bit number that comes in as a separate word in the F1
> data.
> It is different from the 16bit “time” member which contains the actual
> measurement.
> It is also not to be confused with the 40bit value in the
> DF1TDCTriggerTime objects.
>
> The reason I’m asking is because I’m considering dropping the chip header
> word
> that contains this value when reconstituting single events required for L3
> output.
> This simplifies some code and makes the data a little more compact.
>
> Let me know if this is being used for anything and I’ll make sure it gets
> put in there.
> Otherwise, I will probably omit it.
>
> Regards,
> -David
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