Datasheet

2009-2016 Microchip Technology Inc. DS00002306A-page 29
LAN9514/LAN9514I
2:1 Over Current Sense (CURRENT_SNS)
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!)
01b
0 Port Power Switching (PORT_PWR)
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
1b
TABLE 3-5: CONFIG DATA BYTE 2 REGISTER (CFG2) FORMAT
BITS DESCRIPTION DEFAULT
7:6 RESERVED 00b
5:4 Over Current Timer (OC_TIMER)
Over Current Timer delay
00 = 50 ns
01 = 100 ns (This is the recommended value)
10 = 200 ns
11 = 400 ns
01b
3 Compound Device (COMPOUND)
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
1b
2:0 RESERVED 000b
TABLE 3-6: CONFIG DATA BYTE 3 REGISTER (CFG3) FORMAT
Bits Description Default
7:4 RESERVED 0h
TABLE 3-4: CONFIG DATA BYTE 1 REGISTER (CFG1) FORMAT (CONTINUED)
Bits Description Default