USB 2.0 Hi-Speed Hub Controller
Datasheet
Please see the Internal Register Set (Common to EEPROM and SMBus) for a list of the available data
fields. Please visit www.smsc.com/ftpdocs/usb.html to locate the configuration utility for the hub
EEPROM data. Select the “e2prommap.msi” link to download the tool.
Each register has R/W capability. SMBUS and EEPROM Reset Values are 0x00. Reserved registers
should be written to ‘0’ unless otherwise specified. Contents read should be ignored (such as the case
of ‘R’ in the table below).
8.2.1
Internal Register Set (Common to EEPROM and SMBus)
Table 8.2 Internal Default, EEPROM and SMBus Register Memory Map
DEFAULT ROM VALUES (HEXIDECIMAL)
ADDRESS
REGISTER NAME
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
Vendor ID LSB
Vendor ID MSB
24
04
Product ID LSB
12
13
14
12
13
14
17
Product ID MSB
25
Device ID LSB
00 A0
00 0A
8B
00
00
A0
0B
00
00
Device ID MSB
Configuration Data Byte 1
Configuration Data Byte 2
Configuration Data Byte 3
Non-Removable Devices
Port Disable (Self)
9B
20
02
00
08
08
00
00
Port Disable (Bus)
Max Power (Self)
01
32
01
32
32
00
Max Power (Bus)
Hub Controller Max Current (Self)
Hub Controller Max Current (Bus)
Power-on Time
Language ID High
12h
13h
14h
15h
16h-53h
Language ID Low
R
R
R
R
R
00
00
00
00
00
Manufacturer String Length
Product String Length
Serial String Length
Manufacturer String
SMSC USB251x
35
Revision 1.0 (3-11-09)
DATASHEET
SMSC [ SMSC CORPORATION ]
