Run Control (3)

Handling Run Types

• Run parameters, eg run type (normal or calibration) can be changed in the Configured state, so hardware settings which may depend on the run type should only be done at the transition into the Running state
• We will probably have some test run which alters any given parameter in the system
• Safest and simplest to always load (almost) everything at the transition to the Running state, ie thresholds, lookup tables, etc
• Only add complexity if performance requires it (ie we are the slowest system in ATLAS)
• Exception may be TTCrx settings: want to establish board clocks and link synchronisation earlier.
• Change TTCrx clock delays by reading existing value and moving to new value in small increments with delays to allow PLLs to catch up?