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FMC DEL 1ns 4cha
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Opened Jul 08, 2013 by Tomasz Wlostowski@twlostow
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WR - "jumpless" switchover

Enabling the WR mode after a WR link failure causes a "jump" in the card's time base, as the WR synchronization is re-done from scratch.

If the local time has not diverged too much (too much = a programmable threshold), realign local time to WR with SoftPLL phase shifter only, without touching PPS generator counters. This also applies to other WR-enabled cards (TDC, ADC).

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Reference: project/fmc-delay-1ns-8cha#11