Embodiments of the present invention include an adaptive equalizer system for {TAIL ~ use} in a serial communication link, in which timing information associated with the NRZ data as generated by a phase detector of a CDR circuit of the serial communication link and {HEAD ~ a frequency pattern} of the recovered NRZ data is used to determine whether the NRZ data received over the serial communication link is over equalized or under equalized 
Embodiments of the present invention include an adaptive equalizer system for { TAIL ~ use } in a serial communication link , in which timing information associated with the NRZ data as generated by a phase detector of a CDR circuit of the serial communication link and { HEAD ~ a frequency pattern } of the recovered NRZ data is used to determine whether the NRZ data received over the serial communication link is over equalized or under equalized
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