SMSC USB2640i - Manual (Page 9)

Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo
SMSC USB2640/USB2641 9 Revision 2.0 (10-03-08)
DATASHEET
1.2 OEM 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 I
2 C 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