USB2513 datasheet(45/72 Pages) SMSC

45 / 72 page

USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251x

Revision 1.0 (3-11-09)

DATASHEET

8.2.1.25

8.2.1.26

8.2.1.27

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). 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

7:0

BC_EN

Only available in USB251xB/Bi hub family products.

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= Reserved

Bit 6= Reserved

Bit 5= Reserved

Bit 4= Controls Port 4

Bit 3= Controls Port 3

Bit 2= Controls Port 2

Bit 1= Controls Port 1

Bit 0= Reserved

BIT

NUMBER

BIT NAME

DESCRIPTION

7:2

Reserved

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, OEM

should use a ‘00’ value unless specific implementation issues

require additional signal boosting to correct for degraded USB

signalling levels.

USB2513 数据表(PDF) 45 Page - SMSC Corporation

USB2513 数据表(HTML) 45 Page - SMSC Corporation

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USB2513 数据表(PDF) 45 Page - SMSC Corporation

USB2513 数据表(HTML) 45 Page - SMSC Corporation

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