Adaptive manchester decoding with adjustable delay and power saving mode
First Claim
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1. A method for decoding a Manchester coded signal comprising the steps of:
- tracking jitter in said Manchester coded signal;
introducing an adjustable delay in said Manchester coded signal;
adjusting said adjustable delay to synchronize said Manchester coded signal with a clock signal.
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Abstract
A method and apparatus for recovering clock and data signals from a Manchester code is provided. The present invention uses a phase lock loop with a digital delay line wherein an adjustable delay is introduced into the Manchester coded signal for synchronizing the coded signal with the local clock of the decoding apparatus. This delaying technique enables the present invention to successfully receive Manchester coded signals having substantial jitter. The present invention also conserves energy by reducing power consumption when no signals are present.
41 Citations
20 Claims
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1. A method for decoding a Manchester coded signal comprising the steps of:
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tracking jitter in said Manchester coded signal; introducing an adjustable delay in said Manchester coded signal; adjusting said adjustable delay to synchronize said Manchester coded signal with a clock signal. - View Dependent Claims (2, 3, 4, 5)
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6. A circuit for decoding a Manchester coded signal comprising:
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a logic block for detecting jitter in said Manchester coded signal; a delay unit block for introducing an adjustable delay in said Manchester coded signal; said logic block further comprising a four phase clock for providing adjustment of said adjustable delay relative to a clock signal of said four phase clock. - View Dependent Claims (7, 8, 9)
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10. A method for recovery Manchester coded signals comprising the steps of:
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indicating a presence of an incoming Manchester coded signal; activating a Manchester decoder in response to said presence; introducing delay in said Manchester coded signal; deriving an address from said Manchester coded signal; comparing an address derived from said Manchester coded signal to an address qualification; controlling activity of said Manchester decoder in response to said step of comparing. - View Dependent Claims (11, 12)
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13. A system comprising:
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a physical layer transceiver coupled to a transmission medium for receiving a Manchester coded signal from said transmission medium; a Manchester decoder coupled to said physical layer transceiver for recovering a clock signal and a data signal from said Manchester coded signal, said Manchester decoder comprising a delay unit block and a logic block, said delay unit block for introducing an adjustable delay in said Manchester coded signal relative to a clock signal and said logic block for adjusting said adjustable delay to synchronize said Manchester coded signal with said clock signal; a data link controller for monitoring said data signal for an address, for comparing said address to an address qualification to produce an outcome, and for controlling said Manchester decoder based on said outcome. - View Dependent Claims (14, 15, 16, 17)
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18. A method for decoding a Manchester coded signal comprising the steps of:
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tracking jitter in said Manchester coded signal; introducing a delay in said Manchester coded signal to synchronize said Manchester coded signal with a clock signal; detecting a presence of said Manchester coded signal; entering a powerup mode upon said presence; detecting an absence of said Manchester coded signal; entering a powerdown mode upon said absence.
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19. A method for decoding a Manchester coded signal comprising the steps of:
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tracking jitter in said Manchester coded signal; introducing a delay in said Manchester coded signal to synchronize said Manchester coded signal with a clock signal; detecting a presence of said Manchester coded signal; entering a powerup mode upon said presence; comparing a destination address recovered from said Manchester coded signal to a pre-defined address qualification; detecting a mismatch between said destination address and said predefined address qualification; entering a powerdown mode after said mismatch is detected.
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20. A method for decoding a Manchester coded signal comprising the steps of:
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tracking jitter in said Manchester coded signal; introducing a delay in said Manchester coded signal to synchronize said Manchester coded signal with a clock signal; detecting a presence of said Manchester coded signal; entering a powerup mode upon said presence.
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Specification