Adaptive PRML core development for SoC CD/DVD multi controller IC

A new adaptive PRML architecture, considered not only DVD-ROM but also DVD-Multi including DVD-RAM as well, is presented to demonstrate its superiority over the conventional analog channel in a DVD system. For this new architecture, channel adaptation algorithm using gain controlled type of FIR filter, and asymmetry compensation algorithm using expected level adaptation of viterbi decoder are presented. In addition, a method of modelling the disk tilt and asymmetrical read-back signal are discussed. A sample chip is fabricated using 0.18um CMOS technology to demonstrate the performance of the proposed architecture. The chip is now under mass production.