
High Speed
Datasheet
Chapter 8 Configuration Options
8.1Hub
SMSC’s USB 2.0 hub is fully compliant to the Universal Serial Bus Specification available from the USB Implementer’s Forum found at http://www.usb.org (Revision 2.0 April 27, 2000 and the 12/7/2000 and 5/28/2002 Errata). Please reference Chapter 11 (Hub Specification) for general details regarding hub operation and functionality.
For performance reasons, the hub provides 1 transaction translator (TT) that is shared by both downstream ports defined as a
8.1.1Hub Configuration Options
The SMSC 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:
via the internal default settings or
by settings stored in an external EEPROM or SPI Flash device.
8.1.1.1Power Switching Polarity
The hub will only support active high power controllers.
8.2Card Reader
The SMSC USB4640/USB4640i is fully compliant with the following flash media card reader specifications:
Secure Digital 2.0 / MultiMediaCard 4.2
Memory Stick 1.43
Memory Stick Pro Format 1.02
Memory Stick
Memory Stick Duo 1.10
8.3System Configurations
8.3.1EEPROM/SPI Interface
The USB4640/USB4640i can be configured via a
Revision 1.0 | 28 | SMSC USB4640/USB4640i |
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