Dyna Family - Silicon Motion

Mobile Storage
Dyna Family
‑ Card Reader Controllers
SM331L
Key Features
USB2.0 SD/MMC Flash Memory Card Reader Controller

Adheres to Universal Serial Bus Specification Revision 2.0
Overview

Adheres to USB Mass Storage Class Bulk-only Transport
specification v1.0
The SM331L, a high performing USB2.0 Flash memory
card reader controller, is compatible with most up to date
SDHC (SD2.0), MMC4.2. All Flash memory card host

Supports high-speed (480Mbps) and full-speed (12Mbps)
data transmissions

Flash Memory card supports:
interfaces utilize the maximum data transmission rate.
- Secure-Digital™ (SD) v1.0/v1.1/v2.0
Equipped with high-integration 0.16µm process
technology, the SM331L built-in PowerMost FETs for
- Multi-Media Card™ (MMC) specification
v3.x/v4.0/v4.1/v4.2
• SDHC, SD, Mini SD™ and Micro SD™
memory card power and 5v/3.3v, 3.3v/1.8v regulators for
core logic and memory card power to lower material costs.
The built-in Voltage Drop Detector (VDT) protects the

Single 5v operation
SM331L if a damaged Flash memory card is inserted.

Built-in 5v/3.3v and 3.3v/1.8v voltage regulators

Built-in 1.8v POR (Power-On-Reset)

Built-in PowerMost FETs offering Flash memory card power

Supports USB suspend/resume

Operation LED indicators
under Windows98 and 2000 SP1/SP2. The SM331L is
optimized for system communication with Flash memory

Single 12MHZ clock input

Supports hardware Error Correction Code (ECC)
media, and is appropriate for either standalone card reader
stations or embedded systems such as desktop and laptop
PCs, game consoles, LCD TVs and photo printers.

Supports hardware Cyclic Redundancy Check (CRC)
The SM331L is driverless compatible with most common
operating systems, including Windows Vista, XP, 2000,
ME, WinCE5.0, MAC10x and Linux Redhat This Flash
memory card reader is supported by the SMI vendor driver
Applications
• MMC, High-Speed Multi Media Card™ (HS-MMC),
RS MMC and MMC Micro, MMC-mobile
Target Performance (high-speed)
Package

USB2.0 SD/uSD/MMC card reader

SDHC sustained read rate: 20MB/s*

SSOP28 (209mil)

SD/uSD/MMC card reader for embedded
system

SDHC sustained write rate: 16MB/s*

TQFN28 (4mm×4mm×0.75mm)
*Figures may vary between test platforms and Flash chips.

Die for COB application
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 2008 Silicon Motion, Inc.
Mobile Storage
Dyna Family
‑ Card Reader Controllers
SM331L Block Diagram
5V/3.3V
1.8V OUT
3.3V OUT
3.3V IN
Analog Part
3.3v to 1.8v
Reg.
5v to 3.3v Reg.
(300mA max.)
CORE LOGIC
Card Host
8051
3.3V PMOS
(200mA max.) PWR 1 (3.3V)
ROM
16Kbyte
Card 1
SDHC/MMC
1.8V IN
SRAM
512Bx2
3.3V IN (I/O)
2
0
MAC
(Media Access Controller)
12MHz
USB .
PHY
USB
Host Device
1.8V POR
SM331L Application Block Diagram
USB Host ►
Personal Computer
Laptop PC
Tablet PC
......
www.siliconmotion.com
◄ Memory Card Host:
SM331L
SDHC/MMC
Flash Memory
Card Reader
Digital Camera
MP3
PMP
Game Console
Cellular Phone
......
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 2008 Silicon Motion, Inc.