System transparent retimer
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United States of America Patent
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Jan 2, 2018
Grant Date -
Jan 19, 2017
app pub date -
Jul 17, 2015
filing date -
Jul 17, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A protocol transparent retimer circuit monitors certain link layer control signals, detects far-end receiver parameters of the link partners, and detects attributes of the data signal on the link to determine the link status and operate the retimer in accordance with the determined link status. By combining and reducing host and device system states into a few retimer states, the retimer circuit is largely simplified and yet still serves its purpose. The retimer includes a controller that employs a state machine to interpret the monitored and detected signals to determine the link state and operate the retimer in an operating state corresponding to the determined link state. The approach enables the retimer to restore signal integrity and forward what ever it receives in both downstream and upstream directions of the link without frequency alteration.
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