Makoto Usui

A mixed-signal 0.18-/spl mu/m CMOS SoC for DVD systems with 432-MSample/s PRML read channel and 16-Mb embedded DRAM

This paper describes a fully integrated single-chip CMOS mixed-signal system on a chip (SoC) for DVD RAM and ROM systems. It integrates a 32-b RISC CPU, formatter, servo digital signal processor (DSP), 16-Mb DRAM, error correction code (ECC), ATA interface, and partial-response-maximum-likelihood (PRML) read channel with 7-b interpolated parallel analog-to-digital converter (ADC). Increasing the bus bandwidth by using embedded DRAM, a hardware ECC engine, and four parallel digital finite-impulse response (FIR) filters contributes to the high playback speed of 16/spl times/. PR(3,4,4,3) architecture has been used in the read channel system for optical disc systems. The obtained wide tangential tilt margin of /spl plusmn/0.6/spl deg/ is due to the use of this PRML read channel technique. The interpolated parallel scheme has attained a high number of effective bits of 6.3 for 72-Mz input frequency at 432-MSample/s operation without any calibration technique, with low power consumption of 180 mW in a small core size of 1.05 mm/sup 2/. This SoC has been fabricated in 0.18-/spl mu/m 1PS3AL CMOS embedded DRAM technology. It contains 24 million transistors in a 144-mm/sup 2/ die and consumes 1.2 W at 432-MSample/s operation. This low power consumption allows the use of a low-cost plastic package. As a result, we can compose highly reliable DVD RAM and ROM systems with this SoC and some tiny components.