USB2660 Standard Microsystems Corp., USB2660 Datasheet - Page 7

• 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 1 Overview
SMSC USB2660/USB2660i
The SMSC USB2660/USB2660i is an integrated USB 2.0 compliant, Hi-Speed hub, card reader, and
protocol converter combo solution. This combo solution supports today’s popular multi-format flash
media cards. This multi-format flash media controller and USB hub combo features two exposed
downstream USB ports available for external peripheral expansion. The dedicated flash media
reader/writer is internally attached to a third downstream port of the hub as a USB Compound Device
which supports the following two interfaces: One interface is multiplexed for xD-Picture Card,
Memory Stick, Secure Digital/MultiMediaCard, and SD/Secure Digital Input/Output. The other
interface is dedicated to a second SD card slot for SDIO bridging applications. SDIO bridging is
possible with custom firmware.
The USB2660/USB2660i will attach to an upstream port as a Full-Speed hub or as a Full-/Hi-Speed
hub. The hub supports Low-Speed, Full-Speed, and Hi-Speed (if operating as a Hi-Speed hub)
downstream devices on all of the enabled downstream ports.
All required resistors on the USB ports are integrated into the hub. This includes all series
termination resistors on D+ and D– pins and all required pull-down and pull-up resistors. The over-
current sense inputs for the downstream facing ports have internal pull-up resistors.
The USB2660/USB2660i includes programmable features such as:
PortMap which provides flexible port mapping and disable sequences. The downstream ports of a
USB2660/USB2660i hub can be reordered or disabled in any sequence to support multiple platform
designs with minimum effort. For any port that is disabled, the USB2660/USB2660i automatically
reorders the remaining ports to match the USB host controller’s port numbering scheme.
PortSwap which adds per-port programmability to USB differential-
pair pin locations. PortSwap allows direct alignment of USB signals
(D+/D-) to connectors avoiding uneven trace length or crossing of
the USB differential signals on the PCB.
PHYBoost which enables four programmable levels of USB signal
drive strengths in downstream port transceivers. PHYBoost attempts
to restore USB signal integrity. The diagram on the right shows an
example of Hi-Speed USB eye diagrams before (PHYBoost at 0%)
and after (PHYBoost at 12%) signal integrity restoration in a
compromised system environment.
DATASHEET
7
Revision 1.0 (06-09-09)