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3.6 Maintenance
3.6.1 Debug Counters
For debugging purposes, some status registers are available as debug counters.
Detailed information for each debugging counter is included in the LC-EN Interface document. This
tutorial covers the following debug counters.
• Trigger Filter Noise count = number of hardware TTL triggers that failed trigger noise filter.
• PRE Filter Noise count = number of hardware TTL triggers that failed PRE filter.
• POST Filter Noise count = number of hardware TTL triggers that failed POST filter.
• Valid Trigger count = number of hardware TTL triggers that passed noise filter, PRE filter, and
POST filter.
• VINIT count = number of reset signals sent to CCD
• IRQ count = number of interrupt generated by FPGA to PowerPC
By generating an Ethernet trigger (“All” and “HW Trigger” button on the EN setup video window),
you can see only VINIT and IRQ counters are incrementing. This is because the first four counters are
only for the hardware TTL trigger.
By feeding the hardware TTL trigger, you can see “Valid Trigger count,” “VINIT count” and “IRQ
count” register incrementing.
If you set 1ms to “Trigger Filter Noise” register and the hardware TTL trigger pulse is less than 1ms,
then the trigger is ignored as an invalid signal. Only “Trigger Filter Noise count” must be
incremented. However, all other counters remain the same.