USB2504 Datasheet, PDF (17/42 Pages) SMSC Corporation – INTEGRATED USB2.0 COMPATIBLE 4 - PORT HUB

USB2504/USB2504A
Bit Number
4
Bit Name
MTT_ENABLE
Description
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)
3
EOP_DISABLE 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)
2:1
CURRENT_SNS 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). (Default for self-power)
01 = Individual port-by-port.
1x = Over current sensing not supported. (may be used with Bus-Powered
configurations only!, and is the default for bus-power)
0
PORT_PWR
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.
5.2.3.5 EEPROM Offset 7(h) - CONFIG_BYTE_2
Bit Number
7
6
5:4
3
2:0
Bit Name
DYNAMIC
Reserved
OC_TIMER
COMPOUND
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
OverCurrent Timer: Over Current Timer delay.
00 = 0.1ms
01 = 2ms (Default)
10 = 4ms
11 = 6ms
Compound Device: Designates if Hub is part of a compound device.
0 = No. (Default)
1 = Yes, Hub is part of a compound device.
Reserved.
5.2.3.6 EEPROM Offset 8(h) - Non-Removable Device
Bit Number
7:0
Bit Name
NR_DEVICE
Description
Non-Removable Device: Indicates which port(s) include non-removable devic-
es. ‘0’ = port is removable, ‘1’ = port is non-removable.
Bit 7= Reserved
Bit 6= Reserved
Bit 5= 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’.
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DS000002250A-page 17