USB2504 Datasheet, PDF (23/42 Pages) SMSC Corporation – INTEGRATED USB2.0 COMPATIBLE 4 - PORT HUB

USB2504/USB2504A
5.3.9.7 Register 06h: Device ID (MSB) (Reset = 0x00)
Bit Number
7:0
Bit Name
DID_MSB
Description
Most Significant Byte of the Device ID.
5.3.9.8 Register 07h: CONFIG_BYTE_1 (Reset = 0x00)
Bit Number
7
6
5
4
3
2:1
0
Bit Name
SELF_BUS_PWR
PORT_IND
HS_DISABLE
MTT_ENABLE
EOP_DISABLE
CURRENT_SNS
PORT_PWR
Description
Self or Bus Power: Selects between Self- and Bus-Powered operation.
0 = Bus-Powered operation.
1 = Self-Powered operation.
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.
Port Indicator Support: Indicates implementation of LED indicators
0 = No LED indicators.
1 = LED indicators.
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.
1 = Full-Speed-Only (High-Speed disabled!)
Multi-TT enable: Enables one transaction translator per port operation.
0 = single TT for all ports.
1 = one TT per port (multiple TT’s supported)
EOP Disable: Disables EOP generation of EOF1 when in Full-Speed mode.
0 = EOP generation is normal.
1 = EOP generation is disabled.
Over Current Sense: Indicates whether current sensing is on a port-by-port
basis, or ganged, or no overcurrent sensing.
00 = Ganged sensing (all ports together).
01 = Individual port-by-port.
1x = Over current sensing not supported. (must only be used with Bus-
Powered configurations!)
Port Power Switching: Indicates whether port power switching is on a port-by-
port basis or ganged.
0 = Ganged switching (all ports together)
1 = Individual port-by-port switching.
5.3.9.9 Register 08h: Configuration Data Byte 2 (Reset = 0x00)
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.
Reserved
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DS000002250A-page 23