Datasheet

Conventions
Within this manual, the following abbreviations and symbols are used to improve readability.
Example Description
BIT
Name of a single bit within a field
FIELD.BIT
Name of a single bit (BIT) in FIELD
x…y Range from x to y, inclusive
BITS[m:n]
Groups of bits from m to n, inclusive
PIN Pin Name
zzzzb Binary number (value zzzz)
0xzzz Hexadecimal number (value zzz)
zzh Hexadecimal number (value zz)
rsvd Reserved memory location. Must write 0, read value indeterminate
code Instruction code, or API function or parameter
Section Name Section or Document name
x Don’t care
<Parameter> <> indicate a Parameter is optional or is only used under some conditions
{,Parameter} Braces indicate Parameter(s) that repeat one or more times
[Parameter]
Brackets indicate a nested Parameter. This Parameter is not real and actually decodes
into one or more real parameters.
USB 2.0 Hi-Speed Hub Controller
Datasheet
SMSC USB251xB/xBi 3 Revision 2.2 (02-17-12)
DATASHEET