Silicon Motion EM3255 - Manual

Mobile Storage
Dyna Family
www.siliconmotion.com
This publication, including all photographs, illustrations and software, is protected under
international copyright laws, with all rights reserved. Neither this publication, nor any of the
material contained herein, may be reproduced without written consent of the manufacturer.
© Copyright 2012 Silicon Motion, Inc.
Embedded USB2.0 Flash Controller
EM3255
The EM3255 is a USB Flash controller focusing on
embedded/industrial application (eUSB) usage. It
combines high compatibility and performance to
support single-channel SLC and MLC NAND Flash
memory in a single chip. The EM3255 complies with
USB2.0 power specifications for bus-powered devices.
The EM3255 controller delivers an extremely reliable,
high data transfer rate through the BCH ECC engine
to reduce read/write disturbance errors. Combining
a 5-3.3V regulator and power-on-rest feature, the
EM3255 maximize efficiency and reduces overall
BOM costs. The EM3255 is available in 48-pin
LQFP packages.
Applications
 USB Flash Drive
 Embedded USB Flash Drive (eUSB)
 Embedded/Industrial Application

Telecommunication
 Set-top-box
 IPC/SBC
 Multifunction Printer
 DRAM caching
Key Features
 Complete USB2.0 compliance
 Complies with USB Mass Storage Class
specification version 1.0
 Bulk only transport protocol
 Supports single channels for Flash memory
 12MHz crystal driver circuit
 1.8 volts low power core operation
 Operates on a single power supply
(Vdd = 5.0V or 3.3V)
 Support 3.3V VCCQ SLC and MLC NAND Flash
and up to 4 Flash components
 Field firmware update capability
 Firmware customization capability for specific
application requirement
Reliability
 Industrial approved FTL to protect data in an
ungraceful power lost event.
 DataRefresh and EarlyRetirement features to
prevent data corruption due to uncorrectable
ECC
 Proprietary algorithm for read/retry to retrieve
correct data due to platform instability
 Global Wear Leveling to ensure all NAND flash
blocks are evenly written to extend the device
life.
 HealthMonitoring vendor commands to allow
monitoring the health status
 Extended overprovisioning capability enables
longer life expectancy
 Software “Write Protection” feature enables
data write protect at any instant.