USB2514I datasheet(37/63 Pages) MICROCHIP

37 / 63 page

USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251xB/xBi

Revision 2.2 (02-17-12)

DATASHEET

5.1.25

5.1.26

5.1.27

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

SER_STR

Serial String: UNICODE UTF-16LE per USB 2.0 specification

When supported, the 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.)

Warning: Close attention to the byte order of the selected programming

tool should be monitored.

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

BC_EN

Battery Charging Enable: enables the battery charging feature for the

corresponding port.

0 : battery charging support is not enabled

1 : battery charging support is enabled

Bit 7 : rsvd

Bit 6 : rsvd

Bit 5 : rsvd

Bit 4 : controls port 4

Bit 3 : controls port 3

Bit 2 : controls port 2

Bit 1 : controls port 1

Bit 0 : rsvd

BIT

NUMBER

BIT NAME

DESCRIPTION

7:2

rsvd

1:0

BOOST_IOUT

USB electrical signaling drive strength boost bit for the upstream port.

00 : normal electrical drive strength - no boost

01 : elevated electrical drive strength - low (~ 4% boost)

10 : elevated electrical drive strength - medium (~ 8% boost)

11 : elevated electrical drive strength - high (~12% boost)

Note:

Boost could result in non-USB compliant parameters. Therefore, a

value of 00 should be implemented unless specific implementation

issues require additional signal boosting to correct for degraded

USB signalling levels.

USB2514I Datenblatt(PDF) 37 Page - Microchip Technology

USB2514I Datenblatt(HTML) 37 Page - Microchip Technology

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