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Many thanks again Dave. The timescale line fixed it. Yes you are right I have done only basic coding so far, nothing real world. One day perhaps... if I manage to survive all the FPGA learning. It's just that I've started learning about hardware programming around 4 months ago, but I feel that I spend most of my time learning how to use tools rather than actually doing anything productive. First it was Quartus, then SOPC, then NIOS SBT, now ModelSim.... But I guess it's the way to learn step by step.

Talking about learning, my current testbench in sv for my ST component doesn't do anything yet apart from just displaying a test message. I am trying to write an actual testbench with meaningful inputs.. be prepared for more beginner questions soon :)