[Sbs_gems] [EXTERNAL] Latency register

[Evaristo Cisbani]

Dear All,

I double checked the question of the latency register:

The 132 I mentioned at the meeting is the default value.

The maximum value is in fact 191, however it is suggested to avoid to extend
beyond 160; here the information from the User Guide:

"The latency register contains an 8 bit binary number that defines the
separation between the Write and Trigger pointers in the pipeline memory
control. The register defaults at power-up to a value of 10000100 corresponding
to 132 clock cycles. This value may be programmed to any value up to 191.
However, values larger than 160 will reduce the pipeline efficiency especially
at higher trigger rates). When the register is altered the pipeline must be
reinitialised using RESET101."

Evaristo


On Wed, 2 Jul 2025 21:48:36 +0000
Ching Him Leung via Sbs_gems <sbs_gems at jlab.org> wrote:

> Dear all,
> 
> We will have our weekly GEM meeting tomorrow, the 3rd of July at 11 am EDT.
> 
> Connection details:
> =============
> Join ZoomGov Meeting:
> https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1610639586-3Fpwd-3DTnJoQ3Y5a29xR2RnNDl5eHhqVGRxdz09&d=DwICAg&c=CJqEzB1piLOyyvZjb8YUQw&r=IY9rjQPVeUBORHn2z0jGy7U2Cc-U0-dYM3Rqg9Kcgwk&m=0FcVVoOvYoON6uks7ee_6R1_D3a_BzjDS1FKHJtT5aq4uQH9O3VPuWWdvOcINhDO&s=t7-wwI5sgdk2giNpceiagR-m70JlfSdDLOmBfLyhg5U&e= 
> 
> 
> Meeting ID: 161 063 9586
> Passcode: 316022
> 
> Agenda: https://hallaweb.jlab.org/wiki/index.php/Meeting_2025_07_03 
> =============
> 
> Ching Him
> 
>