Silicon Motion SM2685 - Manual

Mobile Storage
Zoom 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 2011 Silicon Motion, Inc.
SD Controller
SM2685
The SM2685 is a SD 2.0 memory card controller
offering high performance and low power
consumption. In addition to standard SD commands
such as content protection, write protection and card
locking, the SM2685 supports ONFI 2.x interface and
Toggle Mode DDR NAND to achieve higher data
transfer rate for the needs of different system
applications.
With the powerful and configurable ECC engine and
proprietary flash management techniques, the
SM2685 can fully support a variety of MLC and the
new generation TLC (Triple-Level Cell; 3-bit/cell)
NAND flash memories.
Applications
 SD cards of all form factors, including
SD/miniSD/microSD
 Embedded system flash controller
General Features
 Provides 6 GPIO
 Enhanced ESD design
 Package: Die form/46-pin LGA
Key Features
 SD 2.0 Interface

Compliant to SD specifications v1.01/v1.1/v2.0

Applicable for single host voltage 3.3V

4-bit data bus with bus clock rate 0 ~ 50 MHz

Supports Content Protection for Recordable
Media (CPRM)

Supports standard capacity SD memory cards
(≤ 2GB)

Supports SDHC capacity (4GB ~ 32GB)
 SD Command Class

Supports class 0, 2, 4, 5, 6, 7, 8, 10
 Flash Interface

Supports Toggle Mode NAND

Supports ONFI 2.x Interface

Single channel 8-bit flash interface

Configurable hardware ECC engine

8 CE pins for connecting up to 16 NAND flash
devices

3.3V/1.8V flash I/O

Supports 2-plane operation

Supports the following TLC and MLC NAND
flash
- Toshiba/SanDisk 32nm/24nm TLC
- Samsung 27nm TLC
- Intel/Micron 25nm TLC
- Toshiba/SanDisk 24nm MLC
- Samsung 27nm/2ynm MLC
- Intel/Micron 25nm/2ynm MLC
 Upgradeable Firmware

Supports firmware In System Programming
(ISP) function for firmware upgrade

Capable of new features
SD Host
SD
Interface
DMA
Controller
Flash Memory
Interface with
BCH-ECC
RAM ROM
Micro
Processor
NAND
Flash