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Recent content by eefelix

  1. E

    verilog-xl simulation work fine, but ncsim hang up

    Hi, I've a netlist that when running the verilog-xl simulation, the whole simulation can be finished without problem, but when I put the same netlist into ncsim, the simulation will hang up at the middle of the whole simulation. Does anyone come across the same problem ? Do you know the...
  2. E

    verilog-xl simulation work fine, but ncsim hang up

    ncsim hang Hi, I've a netlist that when running the verilog-xl simulation, the whole simulation can be finished without problem, but when I put the same netlist into ncsim, the simulation will hang up at the middle of the whole simulation. Does anyone come across the same problem ? Do you...
  3. E

    Question about RTC and crystal

    Thanks for answering. I still have a question :razz: Let's say if the 32768Hz crystal freq. is deviated by 100ppm (~3Hz) due to manufacturing & temperature variation. How can I fine tune or compensate the generated 1024Hz / 1Hz frequency ? If I fine tune it using digital circuit, all I can do...
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    Question about RTC and crystal

    Thanks for the explanation of "ppm". I still have one question : when I look at those crystal spec. they usually have a parameter call "freq. tolerance" / "calibration tolerance", what's that mean ? If the value is say 100ppm@25C for 32768Hz crystal, is that mean : A. each crystal may contain...
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    Question about RTC and crystal

    BTW, can anyone tell me how to relate "ppm" with the crystal freq. in terms of "+/-Hz" ? I've seen lots of spec. mentioning accuracy in terms of "ppm", but I don't know how to convert it into "+/-Hz" or "+/-sec per month"... etc. Thanks! Felix.
  6. E

    Question about RTC and crystal

    Thanks for the suggestion. Unfortunately I can't use crystal at MHz range :sad: Higher frequency means higher power consumption...
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    Question about RTC and crystal

    eefelix Hello everyone, Recently I've a real time clock project, the objective is to generate an accurate 1Hz output using 32768Hz crystal. At first I think it's a simple project, all I've to do is to create a 15-bit prescaler circuit ( 32768/(2^15)=1Hz ). The problem is: our customer want...
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