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USB MultiSwitch
TM
Hub
Datasheet
SMSC USB2524 29 Revision 1.91 (08-22-07)
DATASHEET
7.1.4.25 Register 92h-CFh: Serial String (Reset = 0x00)
7.1.4.26 Register D0h: Port Interface Delay Timer (Reset = 0x00)
7.1.4.27 Register D1h: Port Assign Interface Configuration 0A (Reset = 0x00)
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’
to
‘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’
to
‘1111’
Reserved, will default to ‘0001’ value