Hi Stefan,
No we only use one evaluation board. We use the evaluation board as a part of our beam test setup. It includes a telescope based on the current PSI46V2.1 CMS Pixel chip and a trigger logic board for triggering the telescope and the evaluation board. This includes a 
handshake between every device and the tlu
e.g. the tlu expects an answer for each trigger.
If the trigger comes within this first 200 mus it seems that not every trigger is accepted.
In this moment our readout would 'die' since the tlu is waiting for the handshake.
Cheers
Felix

> I presume you have several evaluation boards and want to run them in sync, right?
> 
> This can be either made in daisy-chain mode (see manual page 25). In this case only the master board can trigger the slave boards. If you need to trigger on SEVERAL boards (like a coincidence between two boards), you have to do this with an external trigger and 
busy logic. This is rather 
> complicated and needs detailed explanations. So come to my office and I will teach you.
> 
> Best,
> Stefan