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High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller
Datasheet
SMSC USB4640/USB4640i 33 Revision 1.0 (06-01-09)
DATASHEET
8.4.1.3 02h-19h: USB Serial Number Option
8.4.1.4 1Ah-1Bh: USB Vendor ID Option
8.4.1.5 1Ch-1Dh: USB Product ID Option
8.4.1.6 1Eh: USB Language Identifier Descriptor Length
8.4.1.7 1Fh: USB Language Identifier Descriptor Type
8.4.1.8 20h: USB Language Identifier Least Significant Byte
8.4.1.9 21h: USB Language Identifier Most Significant Byte
BYTE NAME DESCRIPTION
25:2 USB_SER_NUM Maximum string length is 12 hex digits. Must be unique to each device.
BYTE NAME DESCRIPTION
1:0 USB_VID This ID is unique for every vendor. The vendor ID is assigned by the USB
Implementer’s Forum.
BYTE NAME DESCRIPTION
1:0 USB_PID This ID is unique for every product. The product ID is assigned by the vendor.
BYTE NAME DESCRIPTION
0 USB_LANG_LEN USB language ID string descriptor length as defined by Section 9.6.7 “String”
of the USB 2.0 Specification (Revision 2.0, 2000). This field is the “bLength”
which describes the size of the string descriptor (in bytes).
BYTE NAME DESCRIPTION
1 USB_LANG_TYP USB language ID string descriptor type as defined by Section 9.6.7 “String”
of the USB 2.0 Specification (Revision 2.0, 2000). This field is the
“bDescriptorType” which is a constant value associated with a string
descriptor type.
BYTE NAME DESCRIPTION
2 USB_LANG_ID
_LSB
English language code = ‘0409’. See Note 8.3 to reference additional
language ID’s defined by the USB-IF.
BYTE NAME DESCRIPTION
3 USB_LANG_ID
_MSB
English language code = ‘0409’. See Note 8.3 to reference additional
language ID’s defined by the USB-IF.