The JM20337 is single chip solution to bridge between Hi-Speed USB, SATAII Gen1 and ATA/ATAPI-based mass storage devICe. It provides the capability to translate USB mass storage commands to serial ATA and ATA/ATAPI communication protocol. The USB adheres the Mass Storage Class Bulk-Only Transport Specification, and supports dual LUN operation, which could connect to two ATA/ATAPI devices or one ATA/ATAPI device associated with one SATA device. The embedded command parser supports both ATA and ATAPI command set with LBA48 addressing capability. This chip also supports the optional hot plug feature of SATA to USB, which reports the USB disconnection/connection event to PC host while SATA device is attached or detached. This chip is designed by 0.18um CMOS technology with 64 LQFP package.