Datasheet
High-Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
Datasheet
SMSC USB4640/USB4640i 25 Revision 1.3 (03-13-13)
DATASHEET
Chapter 4 Configuration Options
4.1 Hub
SMSC’s USB 2.0 hub is fully compliant to the Universal Serial Bus Specification [1].
The hub provides 1 transaction translator (TT) that is shared by both downstream ports defined as a
single-TT configuration. The TT contains 4 non-periodic buffers. The hub supports a large number of
features (some are mutually exclusive), and must be configured in order to correctly function when
attached to a USB host controller. There are two principal ways to configure the hub:
Internal default settings
External EEPROM or SPI Flash device
Note: See Chapter 11 (Hub Specification) of the USB specification for general details regarding hub
operation and functionality.
4.2 Card Reader
The SMSC USB4640/USB4640i is fully compliant with the following flash media card reader
specifications:
Secure Digital 2.0/MultiMediaCard 4.2
—SD 2.0, HS-SD, HC-SD
—TransFlash™ and reduced form factor media
—1/4/8 bit MMC 4.2
Memory Stick 1.43
Memory Stick Pro Format 1.02
Memory Stick Pro-HG Duo Format 1.01
—Memory Stick, MS Duo, HS-MS, MS Pro-HG, MS Pro
Memory Stick Duo 1.10
xD-Picture Card 1.2
4.3 System Configurations
4.3.1 EEPROM/SPI Interface
The USB4640/USB4640i can be configured via a 2-wire I
2
C EEPROM (512x8) or an external SPI flash
device containing the USB4640/USB4640i firmware. If an external configuration device does not exist
the internal default values will be used. If one of the external devices is used for configuration, the
USB4640/USB4640i values can be updated through the USB interface. The hub will then attach to the
upstream USB host.
The USBDM tool set is available in the USB264x Hub Card reader combo software release package.
To download the software package from SMSC's website, visit:
https://www2.smsc.com/mkt/CW_SFT_PUB.nsf/Agreements/OBJ+Hub+Card+Reader
Review the license and select the
I agree checkbox, followed by the Confirm button. Download the
USB264x Hub Card reader combo Release Package zip file with the USBDM tool set will then be
available for download.