Datasheet – SMSC USB2502 User Manual
Page 20
2-Port USB 2.0 Hub Controller
Datasheet
Revision 2.3 (08-27-07)
20
SMSC USB2502
DATASHEET
5.2.3.1
EEPROM Offset 1:0(h) - Vendor ID
5.2.3.2
EEPROM Offset 3:2(h) - Product ID
Config Data
Byte 1
6
1
88
0C
Configuration data byte #1 for Hub options.
Config Data
Byte 2
7
1
90
90
Configuration data byte #2 for Hub options.
Non
Removable
Device
8
1
00
00
Defines the ports that contain attached
devices (this is used only when Hub is part of
a compound device).
Port Disable
Self-Powered
9
1
00
00
Selects the ports that will be permanently
disabled
Port Disable
Bus-Powered
A
1
00
00
Selects the ports that will be permanently
disabled
Max Power
Self-Powered
B
1
01
01
Max Current for this configuration (expressed
in 2mA units).
Max Power
Bus-Powered
C
1
64
64
Max Current for this configuration (expressed
in 2mA units).
Hub Controller
Max Current
Self-Powered
D
1
01
01
Max Current (expressed in 2mA units).
Hub Controller
Max Current
Bus-Powered
E
1
64
64
Max Current (expressed in 2mA units).
Power-On
Time
F
1
32
32
Time until power is stable.
BIT
NUMBER
BIT NAME
DESCRIPTION
15:8
VID_MSB
Most Significant Byte of the Vendor ID.
7:0
VID_LSB
Least Significant Byte of the Vendor ID.
BIT
NUMBER
BIT NAME
DESCRIPTION
15:8
PID_MSB
Most Significant Byte of the Product ID.
7:0
PID_LSB
Least Significant Byte of the Product ID.
Table 5.1 User-Defined Descriptor Data (continued)
FIELD
BYTE
MSB:
LSB
SIZE
(BYTES)
DEFAULT
CFG
SELF
(HEX)
DEFAULT
CFG
BUS
(HEX)
DESCRIPTION