...
Linac Locking - A System Level Overview
The Timing Pattern Receiver (TPR) is an application that replaced the Event Receiver (EVR) for LCLS-II and its purpose is to generate triggers for control, data acquisition and other purposes. There are two main flavors in which this application is deployed: (i) as a PCIe board and (ii) as an ATCA board. The IOC described here is for a PCIe card. The TPR operates at a faster rate than the EVR (i.e. higher bandwidth), has a more compact frame and also has an LCLS-I timing fiber input, thus allowing it to switch to an LCLS-I operating mode if needed.
...