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CC1021.Need to understand how to separate the Data from the Preamble.please reply ASAP

I have a demo board which comprises of a Chipcon CC1021 chip connected to a Microcontroller.Reading thru the Datasheets of CC1021 i understand that the CC1021 can be used to Modulate data in either NRZ,Manchester Encoded or Transparent Async UART format.Now apart from all this we need to have a Preamble for all data packets which is just a sequence of 1s and 0s and this is not encoded in any of the formats(NRZ,Manchester Encoded or Transparent Async UART). Is there a way to isolate the Preamble from the data.If so how?

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arun.wuppuluri
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Hi Arun, With "basic logic" transceivers like the CC1021 it is you job, I mean the managment of preambles, synchronization bytes, data framing, checksums, etc should be done by the microcontroller in charge of the CC1021. You will find application notes on Texas's web site with code examples running on their demo board. As you've stated on the logic side the only processing that could be done by the RF chip is NRZ/Manchester encoding & decoding, nothing more. Alternatively, if a slightly lower sensitivity is ok for you application, you can have a look at newer chips like the CC1101/CC1100 which allows a full hardware management of preamples and framing. Yours, Robert Lacoste ALCIOM - The mixed signal experts

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Robert Lacoste

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