Hi Idir,

solution depends on the Xilinx device you're using, if you have a processor (i.e. ZYNQ) or not and if you have access to a SD-card or similar.

1.) run a timer and at event time store a time-stamp in a dual-port-buffer (block-RAM)

2.) read the buffer content by a processor (ARM on ZYNQ or MicroBlaze on other FPGAs) and store it on an SD-card. You need somehow a PC-compatible file system support (library) on your processor.

Hope that helps

Peter

Thanks, Peter,

I actually use ZCU102 Zynq Ultrascale+ MPSoC Evaluation Kit.

Thanks for the suggestion. I already implemented a timer but I do not know how to store the event time!

Best.

my concept would be:

- the timer should run at a frequency which fits to your time resolution needs

- the timer is free running, word width fits to experiment duration

- there is an address pointer register for the write port of the dual port RAM

this will wrap around at the top of the RAM back to the bottom, this will

form a ring buffer in fact

- there is a state machine with states like:

-- "waiting for event", "write timestamp"

- the event occurrence triggers the state machine to change from "wait" to "write"

- in "write"

-- the timer content will be written to a memory location pointed to by the

address pointer (give a write pulse)

-- by changing back to "wait" the address pointer will be incremented

- the address pointer can be made readable for the ARM core to observe

amount of stored data, after a certain amount of timestamps written

the ARM core will read timestamps through the dual port RAM read port

and write the content to a file