The high-speed serial interface chip is an important IP in high-performance interconnect network communication.This paper proposes a DSP design for 56 Gb/s high-speed Serdes receivers,in response to the problem of high bit error rate caused by severe channel attenuation over long transmis-sion distances in high-performance interconnect network backplane communication using 56 Gb/s four pulse amplitude modulation(PAM4)signals.The DSP adopts a 64-channel parallel structure and processes the digitized signal from the receiver through a 16-Tap feed forward equalizer(FFE)and a de-cision feedback equalizer(DFE).By using the K-means clustering algorithm to generate dynamically changing DFE decision levels and combining it with the least mean square(LMS)algorithm,it can han-dle the equalization problem under different channel attenuation of 15～35 dB.To verify the perform-ance of the algorithm,an experimental verification platform based on analog frontend chips and field programmable gate arrays(FPGA)was constructed.The experimental results indicate that the channel attenuation is 15～35 dB@14 GHz at a speed of 56 Gb/s,the error rate is less than 5e-10.
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