Datasheet

High-Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
Datasheet
Revision 1.3 (03-13-13) 8 SMSC USB4640/USB4640i
DATASHEET
Chapter 1 Overview
The USB4640/USB4640i is a Hi-Speed HSIC USB hub and card reader combo solution with an
upstream port compliant to the High-Speed Inter-Chip USB Electrical Specification Revision 1.0 [2].
The two downstream ports are USB 2.0 compliant, and the dedicated flash media reader/writer is
internally attached to a 3
rd
downstream port as a USB compound device.
High-Speed Inter-Chip (HSIC) is a digital interconnect bus that enables the use of USB technology
as a low-power chip-to-chip interconnect at speeds up to 480 Mb/s (see the High-Speed Inter-Chip
USB Electrical Specification Revision 1.0). This combo solution supports several 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 USB4640/USB4640i can attach to an upstream port as a Full- or Full/Hi-Speed hub. The hub
supports Low-Speed, Full-Speed, and Hi-Speed downstream devices (if operating as a Hi-Speed
hub) on all of the enabled downstream ports.
All required resistors on the USB ports are integrated into the hub, including 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 USB4640/USB4640i includes programmable features, such as:
 PortMap: provides flexible port mapping and disable sequences. The downstream ports of a
USB4640/USB4640i hub can be reordered or disabled in any sequence to support multiple
platform designs with minimum effort. For any port that is disabled, the USB4640/USB4640i hub
controllers automatically reorder the remaining ports to match the USB host controller’s port
numbering scheme.
 PortSwap: adds per-port programmability to USB differential-
pair pin locations. PortSwap also allows direct alignment of USB
signals (D+/D-) to connectors to avoid uneven trace length or
crossing of the USB differential signals on the PCB.
 PHYBoost: enables 4 programmable levels of USB signal drive
strength in downstream port transceivers. PHYBoost will also
attempt to restore USB signal integrity.
Note: PHYBoost is only available on the two USB downstream
ports.
1.1 Hardware Features
 Single chip HSIC hub and flash media controller combo
 USB2660/USB2660i supports the commercial temperature range of 0°C to +70°C
 USB4640/USB4640i supports the industrial temperature range of -40°C to +85°C
 Transaction translator (TT) in the hub supports operation of FS and LS peripherals
 Full power management with individual or ganged power control of each downstream port
 Optional support for external firmware access via SPI interface
 Onboard 24 MHz crystal driver circuit
 Optional external 24 MHz clock input (must be a 1.8 V signal)
 Code execution via SPI ROM which must meet the following criteria:
—30 MHz or 60 MHz operation support
—Single bit or dual bit mode support
—Mode 0 or mode 3 SPI support