To Synchronize the FEE64 ASIC clocks to rise at the same timestamp time use the System function Synchronise the ASIC clocks in the System Wide Checks browser page.

The Server will read the current timestamp value and calculate, based on the number of FEEs and the access delay, a timestamp value sometime in the future. F_stamp

F_stamp is written to each FEE and the synchronization is enabled. 

In a state machine in the FEE ASIC clock control, logic is enabled to synchronize its ASIC clock. It compares the current timestamp with F_stamp and if the current timestamp is >= F_stamp then it will start the ASIC clock.

The report in the browser log window gives the 3 LSBs of the timestamp at the instant the ASIC clock is started. They should all be the same. They are from the 10ns timestamp.