Description
The JM20337 is single chip solution to bridge between USB 2.0, SATA and ATA/ATAPI-based mass storage device. It provides the capability to translate USB 2.0 mass storage commands to serial ATA and ATA/ATAPI communication protocol. The USB adheres to 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 bit addressing capability.

Features
• Compliance with Gen1i, and Gen1m of
   Serial ATA II Electrical Specification 1.0
• Support SATA spread-spectrum transmitter
• Support SATA II Asynchronous Signal
   Recovery (Hot Plug) feature
• Compliance with USB 2.0 (Hi-Speed)
   electrical specification
• Compliance with USB Mass Storage Class
   Bulk-Only Transport Specification
• Support 480Mbps High Speed (HS) and
   12Mbps Full Speed USB operation
• Support ATA/ATAPI Ultra DMA Mode
• Support ATA/ATAPI PACKET command
   feature set
• Support ATA/ATAPI LBA48 bit addressing
   mode
• Support dual LUN (Logic Unit Number)
   with automatically master/slave enumeration
• Support 12MHz external crystal.
• Single-power 3.3V power supply
• 0.18um CMOS technology and 64-pin LQFP
   ASSP package
  
Applications
USB & SATA products
• Enclosure System
• Storage subsystem
• 2 bays storage system
• Backward compatible
   Storage system