Embodiments of the present invention include an adaptive equalizer system for use in a serial communication link, in which timing {TAIL ~ information} associated with {HEAD ~ the NRZ data} as generated by a phase detector of a CDR circuit of the serial communication link and 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 use in a serial communication link , in which timing { TAIL ~ information } associated with { HEAD ~ the NRZ data } as generated by a phase detector of a CDR circuit of the serial communication link and 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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