USB2660 Standard Microsystems Corp., USB2660 Datasheet - Page 29

• Manufacturer Part Number: USB2660
• Description: Ultra Fast Usb 2.0 Hub And Multi-format Flash Media Controller With Dual Sd Interfaces
• Manufacturer: Standard Microsystems Corp.

Ultra Fast USB 2.0 Hub and Multi-Format Flash Media Controller with Dual SD Interfaces
Datasheet
Chapter 8 Configuration Options
SMSC USB2660/USB2660i
8.1
8.1.1
8.1.1.1
8.1.2
8.2
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 single-TT configuration. The TT contains 4 non-periodic buffers.
Hub 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:
Power Switching Polarity
The hub will only support active high power controllers.
VBus Detect
According to Section 7.2.1 of the USB 2.0 Specification, a device cannot provide power to its D+ or
D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state. The
VBUS_DET pin on the hub monitors the state of the upstream VBUS signal and will not pull-up the
D+ resistor if VBUS is not active. If VBUS goes from an active to an inactive state (not powered), the
hub will remove power from the D+ pull-up resistor within 10 seconds.
The SMSC USB2660/USB2660i is fully compliant with the following flash media card reader
specifications:
Hub
Card Reader
via the internal default settings or
by settings stored in an external EEPROM or SPI Flash device.
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
DATASHEET
29
Revision 1.0 (06-09-09)