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Method of performing an autobaud function using a state flow machine

  • US 5,222,081 A
  • Filed: 06/28/1991
  • Issued: 06/22/1993
  • Est. Priority Date: 06/28/1991
  • Status: Expired due to Term
First Claim
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1. In a data communications equipment ("DCE"), a modem or a terminal adapter, the DCE arranged for receiving a command bit stream and an information bit stream from a data terminal equipment ("DTE"), a personal computer or work station, the information bit stream including a plurality of words characterized by transmit characteristics, the transmit characteristics including bit rate, word length and parity type, the DCE including a state flow machine having a multiplicity of states, the multiplicity of states including an initial current state and a set of final states, the set of final states correspondingly defining a unique set of transmit characteristics, a method of adjusting the DCE for receiving the information bit stream based on the transmit characteristics, said method comprising the steps of:

  • (a) receiving the command bit stream, said command bit stream including a plurality of coded bits defining one or more transmit characteristics of the corresponding information bit stream to be successively received from the DTE;

    (b) starting at the initial current state of the state flow machine;

    (c) identifying the code of each bit of the command bit stream;

    (d) advancing from said current state to a next state of said state flow machine for each bit of at least part of the command bit stream based on the identified code thereof, said next state becoming the current state for the successive bit of the part of the command bit stream;

    (e) arriving at a final state of said set based on the identified code of a predetermined bit of the command bit stream; and

    (f) adjusting the DCE to receive the information bit stream based on the transmit characteristics defined by the final state as in the arriving step (e).

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