DRS4 Evaluation Board User’s Manual
Page 6 of 43
1.2. LEDs
The DRS4 evaluation board is equipped with three LEDs. They are operated by the micro
controller and the FPGA and have following meaning:
This LED becomes green when the on-board micro-controller booted
successfully. If this LED stays dark, there is either no power or the micro-
controller lost its program, which requires a re-programming of the EEPROM.
When the on-board FPGA boots correctly this LED becomes lit. If it stays dark,
it might be that the FPGA program was lost and requires re-programming. After
booting, this LED indicates the board status. If lit, the DRS4 chip is active and
sampling data. If stopped by software or a trigger, this LED turns off. A special
pulse stretcher ensures that even in high trigger rate environments this LED
does not flash with more than ~10Hz so the blinking can still be seen by eye.
When lit, this LED indicates a error condition
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