Filter
Top Products
Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo
SMSC USB2640/USB2641 31 Revision 2.0 (10-03-08)
DATASHEET
7.3.2.5 22h-5Dh: USB Manufacturer String Length
7.3.2.6 5Eh-99h: USB Product String Length
Note 7.2 While the full strings are reported during USB enumeration, Windows XP/Vista reads
concatenated version of the strings from the standard SCSI inquiry response when storing
the values for display in the Windows registry and device manager.
7.3.2.7 9Ah: USB BmAttribute (1 byte)
BYTE
NUMBER BYTE NAME DESCRIPTION
59:0 USB_MFR_STR Manufacturer String Length
Maximum string length is 28 characters.
(See Note 7.2 below)
BYTE
NUMBER BYTE NAME DESCRIPTION
59:0 USB_PRD_STR Product String Length
This string will be used during the USB enumeration process in Windows.
Maximum string length is 28 characters.
(See Note 7.2 below)
BYTE
NUMBER BYTE NAME DESCRIPTION
7:0 USB_BM_ATT 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.
80 = Bus-Powered operation
c0 = Self-Powered operation
A0 = Bus-Powered operation with remote wake-up
E0 = Self-Powered operation with remote wake-up