SMSC USB2640 User Manual

SMSC USB2640/USB2641

Revision 2.0 (10-03-08) 

The SMSC USB2640/USB2641 is a USB 2.0 compliant, Hi-

Speed hub for USB port expansion with an attached mass

storage class peripheral controller. The controller allows

read/write capability to popular flash media formats from the

following families:

„

xD-Picture Card

TM

 (xD)

1

 

„

Memory Stick

TM

 (MS)

„

Secure Digital

TM

 (SD)

„

MultiMediaCard

TM

 (MMC) 

The USB2640/USB2641 is a fully integrated, single chip

solution providing USB expansion and integrated flash card

media reader/writer capability of ultra high performance

operation. Average sustained transfer rates exceeding 35 MB/s

are possible if the media and host can support those rates.

„

48-pin QFN package

„

Hub controller with internally connected ultra fast flash 

media reader/writer and 2 exposed downstream ports for 
external peripheral expansion

„

Flash media reader/writer employs multiplexed card 

interfaces which are optimized for use with single card 
insertion combo sockets 

„

Hardware-controlled data flow architecture for all self-

mapped media

„

Optional support for external firmware access via SPI 

interface

1.xD-Picture Card not applicable to USB2641.

„

Single chip flash media controller 

„

Transaction translator (TT) in the hub supports operation of 

FS and LS peripherals

„

Over 30 port configuration options

„

Customizable vendor ID, product ID, language ID

„

On board 24 MHz crystal driver circuit

„

Optional external 24 MHz clock input

„

GPIO configuration and polarity: Up to 8 GPIOs for special 

function use

„

Internal card power FET

„

8051 8-bit microprocessor

„

Internal regulator for 1.8V core operation

„

Optimized pinout improves signal flow, easing 

implementation and allowing for improved signal integrity 

treatment

„

Optimized for low latency interrupt handling

„

Hub and flash media reader/writer configuration from a 

single source: External I

2

C ROM or external SPI ROM

„

EEPROM update via USB

„

Please see the USB2640/USB2641 Software Release Notes 

for additional software features

„

Printers

„

Desktop and Mobile PCs

„

Consumer A/V

„

Media Players/Viewers

„

Vista ReadyBoost

™