Version 1.2

May 2004

© JMicron 2003. All rights reserved.

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JMicron/JM20337

JM20337

Hi-Speed USB to SATA & PATA Combo Bridge

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

Quick Reference

Signal Bit Rate

1.5

Gbps/SATA

and

480

Mbps/USB

Spread Spectrum

-0.3% to 0.0

Power Supply

3.3V

ESD Protection

2000 V

Adj. Amplitude

2 levels

Adj. Pre-emphasis

4 levels

Package

64-pin LQFP

• 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