USB2524 datasheet(29/57 Pages) SMSC

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USB MultiSwitchTM Hub

Datasheet

SMSC USB2524

Revision 1.91 (08-22-07)

DATASHEET

7.1.4.25

7.1.4.26

7.1.4.27

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

SER_STR

Serial String, UNICODE UTF-16LE 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

7:0

PRTDT

Port Delay Timer: A 0-255 bit value that represents a delay of 0-255ms from

the time a state change is detected on the PRT_ASSIGN[3:0] pins until the

internal logic begins the port switching process for the affected port (or ports)

to a different upstream host.

Note:

This register effectively creates a programmable debounce circuit for

mechanical switches that may be connected to the PRT_ASSIGN[3:0]

interface pins.

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PORT_INT_0A

Port Assign Interface 0A: Determines the configuration of the hardware

interface configuration for the assignment of ports 1 & 2 to upstream hosts.

Bit [7:4] =

‘0000’ Port 2 is unassigned

‘0001’ Port 2 owned by UP1

‘0010’ Port 2 owned by UP2

‘0011’

‘1111’

Reserved, will default to ‘0001’ value

Bit [3:0] =

‘0000’ Port 1 is unassigned

‘0001’ Port 1 owned by UP1

‘0010’ Port 1 owned by UP2

‘0011’

‘1111’

Reserved, will default to ‘0001’ value

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