USB2504-JD Standard Microsystems Corp., USB2504-JD Datasheet - Page 30

• Manufacturer Part Number: USB2504-JD
• Description: Interface, Integrated USB2.0 Compatible 4-Port Hub
• Manufacturer: Standard Microsystems Corp.

Revision 1.3 (06-28-04)
5.3.9.9
5.3.9.10
NUMBER
NUMBER
NUMBER
BIT
BIT
BIT
2:1
5:4
2:0
7:0
0
7
6
3
Register 08h: Configuration Data Byte 2 (Reset = 0x00)
Register 09h: Non-Removable Device (Reset = 0x00)
CURRENT_SNS
COMPOUND
NR_DEVICE
PORT_PWR
OC_TIMER
BIT NAME
BIT NAME
BIT NAME
DYNAMIC
Reserved
Reserved
Over Current Sense: Indicates whether current sensing is on a port-by-port
basis, 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.
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
OverCurrent Timer: Over Current Timer delay.
00 = 0.1ms
01 = 2ms
10 = 4ms
11 = 6ms
Compound Device: Designates if Hub is part of a compound device.
0 = No.
1 = Yes, Hub is part of a compound device.
Reserved
Non-Removable Device: Indicates which port(s) include non-
removable devices. ‘0’ = port is removable, ‘1’ = port is non-
removable.
Bit 7= 1; Reserved
Bit 6= 1; Reserved
Bit 5= 1; Reserved
Bit 4= 1; Port 4 non-removable.
Bit 3= 1; Port 3 non-removable.
Bit 2= 1; Port 2 non-removable.
Bit 1= 1; Port 1 non removable.
Bit 0 is Reserved, always = ‘0’.
24
DESCRIPTION
DESCRIPTION
DESCRIPTION
Integrated USB2.0 Compatible 4-Port Hub
SMSC USB2504
Datasheet