SMSC USB2640i - Manual (Page 37)

Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo
SMSC USB2640/USB2641 37 Revision 2.0 (10-03-08)
DATASHEET
7.3.3.14 E1h: Product ID (MSB)
7.3.3.15 E2h: Device ID (LSB)
7.3.3.16 E3h: Device ID (MSB)
7.3.3.17 E4h: Config Data Byte 1 (CFG_DAT_BYT1)
BIT
NUMBER BIT NAME DESCRIPTION
7:0 PID_MSB Most Significant Byte of the Product ID. This is a 16-bit value that the Vendor
can assign that uniquely identifies this particular product.
BIT
NUMBER BIT NAME DESCRIPTION
7:0 DID_LSB Least Significant Byte of the Device ID. This is a 16-bit device release
number in BCD (binary coded decimal) format.
BIT
NUMBER BIT NAME DESCRIPTION
7:0 DID_MSB Most Significant Byte of the Device ID. This is a 16-bit device release
number in BCD format.
BIT
NUMBER BIT NAME DESCRIPTION
7 SELF_BUS_PWR Self- or Bus-Power: Selects between Self- and Bus-Powered operation.
The hub is either Self-Powered (draws less than 2 mA of upstream bus
power) or Bus-Powered (limited to a 100 mA maximum of upstream power
prior to being configured by the host controller).
When configured as a Bus-Powered device, the SMSC hub consumes less
than 100 mA of current prior to being configured. After configuration, the
Bus-Powered SMSC hub (along with all associated hub circuitry, any
embedded devices if part of a compound device, and 100 mA per externally
available downstream port) must consume no more than 500 mA of
upstream VBUS current. The current consumption is system dependent, and
the OEM must ensure that the USB 2.0 specifications are not violated.
When configured as a Self-Powered device, <1 mA of upstream VBUS
current is consumed and all ports are available, with each port being capable
of sourcing 500 mA of current.
0 = Bus-Powered operation
1 = Self-Powered operation
6 Reserved Always reads ‘0’.