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A: Yes, it is
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[documented](https://www.ohwr.org/project/white-rabbit/uploads/ae3282acd8f9f6c5a9067b061202277d/wr_external_reference.pdf)
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h3: Q: The last paragraph of the document above mentions HAL messages
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and RT log. I find HAL messages but what is meant by RT log and where to
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find it?
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A: By the RT (i.e. realtime) log we mean the messages generated by the
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LM32 CPU inside the Virtex FPGA. They may provide useful information for
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debugging the timing subsystem. They can be viewed by connecting a
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serial terminal to the the front left USB port (up to v. 3.2 switches)
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or the "FPGA test" USB port in the rear (newer switches). RS232
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parameters are 115200, 8N1.
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-----
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## General questions
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