USB 2.0 Hub and 10/100 Ethernet Controller
Datasheet
Table 3.4 Config Data Byte 1 Register (CFG1) Format (continued)
DESCRIPTION
Over Current Sense (CURRENT_SNS)
BITS
DEFAULT
2:1
01b
Selects current sensing on a port-by-port basis, all ports ganged, or none
(only for bus-powered hubs) The ability to support current sensing on a port
or ganged basis is hardware implementation dependent.
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!)
0
Port Power Switching (PORT_PWR)
1b
Enables power switching on all ports simultaneously (ganged), or port power
is individually switched on and off on a port by port basis (individual). The
ability to support power enabling on a port or ganged basis is hardware
implementation dependent.
0 = Ganged switching (all ports together)
1 = Individual port by port switching
Table 3.5 Config Data Byte 2 Register (CFG2) Format
BITS
7:6
DESCRIPTION
DEFAULT
00b
RESERVED
5:4
Over Current Timer (OC_TIMER)
Over Current Timer delay
01b
00 = 50ns
01 = 100ns (This is the recommended value)
10 = 200ns
11 = 400ns
3
Compound Device (COMPOUND)
1b
Allows the OEM to indicate that the Hub is part of a compound (see the USB
Specification for definition) device. The applicable port(s) must also be
defined as having a “Non-Removable Device”.
0 = No
1 = Yes, Hub is part of a compound device
2:0
RESERVED
000b
Revision 1.0 (11-24-09)
SMSC LAN9514/LAN9514i
DATA3S0HEET
SMSC [ SMSC CORPORATION ]
