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Jon Titus
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Re: Part IV: Fundamentals of Digital Debugging
Jon Titus   1/19/2012 4:02:54 PM
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Q: How to check CRC value in pattern format t verify the communication link?

 

A:  The sender uses an equation or built-in hardware to calculate the CRC value to append to a message.  The receiver usually has similar software or hardware and as it receives the data, it calculates a CRC value.  The two should match.  If they do not, the receiver raises a "flag" or sets an error bit to indicate an error in the received data.  The receiver also might ask the transmitter to try again, depending on the type of communication.  The receiver also could send a "negative acknowledgement (NAK)" to the transmitter indicate a problem.



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