USB2502-AEZG View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'USB2502-AEZG' PDF : 44 Pages View PDF
2-Port USB 2.0 Hub Controller
Datasheet
5.2.3.3
EEPROM Offset 5:4(h) - Device ID
BIT
NUMBER
15:8
7:0
BIT NAME
DID_MSB
DID_LSB
DESCRIPTION
Most Significant Byte of the Device ID.
Least Significant Byte of the Device ID.
5.2.3.4 EEPROM Offset 6(h) - CONFIG_BYTE_1
BIT
NUMBER
7
6
5
4
3
2:1
0
BIT NAME
SELF_BUS_PWR
Reserved
HS_DISABLE
Reserved
EOP_DISABLE
CURRENT_SNS
Reserved
DESCRIPTION
Self or Bus Power: Selects between Self- and Bus-Powered operation.
0 = Bus-Powered operation. (BUS Default)
1 = Self-Powered operation. (SELF Default)
Note: If Dynamic Power Switching is enabled, this bit is ignored and the
SELF_PWR pin is used to determine if the hub is operating from self or bus
power.
Reserved
High Speed Disable: Disables the capability to attach as either a High/Full-
speed device, and forces attachment as Full-speed only i.e. (no High-Speed
support).
0 = High-/Full-Speed. (Default)
1 = Full-Speed-Only (High-Speed disabled!)
Reserved
EOP Disable: Disables EOP generation at EOF1 when no downstream
directed traffic is in progress.
0 = EOP generation at EOF1 is enabled.
1 = EOP generation at EOF1 is disabled, (normal operation). (Default)
Over Current Sense: Indicates whether current sensing is ganged.
00 = Ganged sensing (all ports together). (Default for self-power)
01 = Reserved
1x = Over current sensing not supported. (may be used with Bus-Powered
configurations only!, and is the default for bus-power)
Reserved
5.2.3.5 EEPROM Offset 7(h) - CONFIG_BYTE_2
BIT
NUMBER
7
6
BIT NAME
DYNAMIC
Reserved
DESCRIPTION
Dynamic Power Enable: Controls the ability for the Hub to transition to Bus-
Powered operation if the local power source is removed (can revert back to
Self-Power if local power source is restored).
0 = No Dynamic auto-switching.
1 = Dynamic Auto-switching capable.(Default)
Reserved
SMSC USB2502
21
DATASHEET
Revision 2.3 (08-27-07)
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