[Halld-offline] F1 TDC trig_time ?

[Beni Zihlmann]

Hi David,

see page 26 of the attached manual on the F1.
this time is used to check the synchronization of the chips on the board
and across boards. for any given trigger these numbers should not vary
by more than one unit across chips. I think that is the only way to verify
and test the internal synchronization.

cheers,
Beni




> 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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