USB2503 datasheet(29/46 Pages) SMSC

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USB 2.0 High-Speed 4-Port Hub Controller

Datasheet

SMSC USB2514

Revision 1.92 (05-08-07)

DATASHEET

4.3.1.25

4.3.1.26

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

SER_STR

Serial String, UNICODE UTF16LE per USB 2.0 Specification

Maximum string length is 31 characters (62 bytes)

Note:

The String consists of individual 16 Bit UNICODE UTF-16LE

characters. The Characters will be stored starting with the LSB at

the least significant address and the MSB at the next 8-bit location

(subsequent characters must be stored in sequential contiguous

address in the same LSB, MSB manner). Some EEPROM

programmers may transpose the MSB and LSB, thus reversing the

Byte order. Please pay careful attention to the Byte ordering or

your selected programming tools.

BIT

NUMBER

BIT NAME

DESCRIPTION

7:2

Reserved

1:0

BOOST_IOUT

Upstream USB electrical signaling drive strength Boost Bit for Upstream

Port.

‘00’ = Normal electrical drive strength

‘01’ = Elevated electrical drive strength (+4% boost)

‘10’ = Elevated electrical drive strength (+8% boost)

‘11’ = Elevated electrical drive strength (+12% boost)

Note:

“Boost” could result in non-USB Compliant parameters (one

example would be Test J/K levels), the OEM should use a ‘00’

value unless specific implementation issues require additional

signal boosting to correct for degraded USB signalling levels.

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