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Modem having first and second registers enabling both to concurrently receive identical information in one context and disabling one to retain the information in a next context

  • US 5,319,792 A
  • Filed: 10/09/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 05/04/1989
  • Status: Expired due to Term
First Claim
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1. A modem comprising:

  • an analog-to-digital converter for producing a digital signal representative of a communication channel to be processed and a context signal indicating that the digital signal is available for processing; and

    a processing device havinga processor for executing digital signal processing operations in digital filtering, demodulation, and descrambling on said digital signal in alternative processing contexts identified by a state of said context signal; and

    a receiver transmitter for receiving communication operations in response to the digital signal processing operations;

    said processor including;

    a plurality of register sets, each of said register sets having a first and second register, said first and second registers connected to concurrently store identical information during one of the processing contexts, said first register connected to individually participate and be continuously available in a next of the processing contexts when said first register is selected thereby enabling the second register to retain said information from said one processing context; and

    a context switching circuit responsive to the state of said context signal and connected to said first and second registers to alternatively control input and output operations of said register set to and from said processor depending on the processing context.

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