USB 2.0 High-Speed 4-Port Hub Controller

Datasheet

 

 

4.3.1.25

Register 92h-CFh: Serial String

 

 

 

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.

 

 

 

4.3.1.26Register F6h: Boost_Up

BIT

 

 

NUMBER

BIT NAME

DESCRIPTION

 

 

 

7:2

Reserved

Reserved

 

 

 

1:0

BOOST_IOUT

Upstream USB electrical signaling drive strength Boost Bit for Upstream

 

 

Port.

 

 

‘00’ = Normal electrical drive strength = No boost

 

 

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

 

 

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

 

 

‘11’ = Elevated electrical drive strength = High (approximately 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.

 

 

 

SMSC USB2514

29

Revision 1.98 (11-19-07)

 

DATASHEET