CMI encoder circuit
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United States of America Patent
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Apr 23, 1996
Grant Date -
N/A
app pub date -
Apr 25, 1994
filing date -
Apr 25, 1994
priority date (Note) -
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Abstract
A Coded Marked Inversion (CMI) encoding circuit having a completely synchronous and digital implementation for encoding a stream of digital data in non-return-to-zero (NRZ) format into the CMI format. The encoding circuit includes a clock for providing a clock signal having a certain period, an input circuit for obtaining two samples of the NRZ data during each clock period, and a state machine which, in response to the two samples of the NRZ data, produces CMI encoded data. In a more advanced implementation, the encoding circuit includes error encoding circuitry for detecting errors in the incoming samples of NRZ data. The encoding circuit then outputs data indicative of the rate at which errors are received.
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