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Quad-Speed CD-ROM LSI Products Featuring High Data Reliability

Yoshimi Iso, Semiconductor & Integrated Circuits Division, Hitachi, Ltd.
Toshifumi Takeuchi, Multimedia Systems R & D Division, Hitachi, Ltd.
Masami Kawamura, Semiconductor & Integrated Circuits Division, Hitachi, Ltd.

ABSTRACT

Now that multimedia support has become a standard feature in personal computers, it is only natural that the number of CD-ROM units being manufactured is increasing at a phenomenal rate. Prices are falling rapidly and quad-speed CD-ROM drives with 200-ms access time have become standard components of these multimedia systems.

With the widespread presence of fast-access CD-ROM drives, data reliability has become an important issue. PC CD-ROM systems use not only cross-interleave Reed-Solomon code (CIRC) high-level error correction techniques, but also additional error correction codes. Yet with the increase in speed to quad-speed, current systems are not taking full advantage of the performance potential inherent in these error correction methods.

Hitachi has developed a low-cost LSI chip set for quad-speed CD-ROMs that provides high data reliability. This chip set reduces the frequency of retry operations required when data cannot be corrected, thus increasing the effective data transfer rate.

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