Datasheet

High-Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
Datasheet
SMSC USB4640/USB4640i 31 Revision 1.3 (03-13-13)
DATASHEET
4.4.1.13 32h-5Dh: Reserved
4.4.1.14 5Eh: USB Product String Descriptor Length
4.4.1.15 5Fh: USB Product String Descriptor Type
4.4.1.16 60h-99h: USB Product String Option
4.4.1.17 9Ah: USB BmAttribute (1 Byte)
BYTE NAME DESCRIPTION
59:16 rsvd
BYTE NAME DESCRIPTION
0 USB_PRD_STR
_LEN
USB product string descriptor length as defined by Section 9.6.7
String of the
USB 2.0 Specification [1]. This field is the bLength, which describes the size
of the string descriptor (in bytes).
BYTE NAME DESCRIPTION
1 USB_PRD_STR
_TYP
USB product string descriptor type as defined by Section 9.6.7
String of the
USB 2.0 Specification [1]. This field is the bDescriptorType, a constant value
associated with a string descriptor type.
BYTE NAME DESCRIPTION
59:2 USB_PRD_STR This string will be used during the USB enumeration process in the Windows
®
operating system. Maximum string length is 28 characters.
BIT 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) or bus-powered
(limited to 100 mA maximum power prior to being configured by the host
controller).
When configured as a bus-powered device, the 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 current. The
current consumption is system dependent and must follow the
USB 2.0
Specification requirements.
When configured as a self-powered device, <1 mA of current is consumed
and all ports are available, with each port being capable of sourcing 500 mA
of current.
80 : (default) Bus-powered operation
C0 : Self-powered operation
A0 : Bus-powered operation with remote wake-up
E0 : Self-powered operation with remote wake-up