Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo

1.2OEM Selectable Features

Hub

A default configuration is available in the USB2640/USB2641 following a reset. The USB2640/USB2641 may also be configured by an external I2C EEPROM or via external SPI flash.

The USB2640/USB2641 supports several OEM selectable features:

„Compound device support (port is permanently hardwired to a downstream USB peripheral device), on a port-by-port basis.

„Select over-current sensing and port power control on an individual (port-by-port) or ganged (all ports together) basis to match the OEM’s choice of circuit board component selection.

„Port power control and over-current detection/delay features

„Configure the delay time for filtering the over-current sense inputs.

„Configure the delay time for turning on downstream port power.

„Bus- or self-powered selection

„Hub port disable or non-removable configurations

„Port signal swapping for easier board layout

„Flexible port mapping and disable sequence. Ports can be disabled/reordered in any sequence to support multiple platforms with a single design. The hub will automatically reorder the remaining ports to match the host controller's numbering scheme.

„Programmable USB differential-pair pin location.

- Eases PCB layout by aligning USB signal lines directly to connectors

„Programmable USB signal drive strength. Recover USB signal integrity due to compromised system environments using 4 levels of signal drive strength.

„Indicate the maximum current that the 2-port hub consumes from the USB upstream port.

„Indicate the maximum current required for the hub controller.

Flash Media Controller

„Customize vendor ID, product ID, and device ID.

„12-hex digit (max) serial number string

„Customizable vendor specific data by optional use of external serial EEPROM

„28-character manufacturer ID and product string for flash media reader/writer

„LED blink interval or duration

SMSC USB2640/USB2641

9

Revision 2.0 (10-03-08)

 

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