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Multi-channel line interface unit with on-chip clock management

  • US 20040252800A1
  • Filed: 06/13/2003
  • Published: 12/16/2004
  • Est. Priority Date: 06/13/2003
  • Status: Abandoned Application
First Claim
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1. A method for clocking a multi-channel Line Interface Unit (LIU) embodied in an integrated circuit and having a plurality of channels, each having a receive path and a transmit path, comprising the steps of:

  • receiving an external reference clock signal;

    generating a free running on-chip clock synchronized to the reference clock signal;

    receiving on at least two of the channels transmit or receive data clocks and associated corresponding transmit and receive data operating at an associated data rate;

    processing the transmit and receive data on each of the respective channels with a portion of the processing occurring in the digital domain;

    generating from the free running clock a separate channel clock for each of the at least two channels and synchronized to the respective received transmit or receive data clocks and referenced to the free running on-chip clock, such that the received transmit or receive data clocks can be independent of each other and referenced to a single external reference signal; and

    utilizing the respective separate channel clock by the digital portion of the step of processing in the respective channel.

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