LAN9514_12 Datasheet, PDF (26/52 Pages) SMSC Corporation – USB 2.0 Hub and 10/100 Ethernet Controller

USB 2.0 Hub and 10/100 Ethernet Controller
Datasheet
Table 3.3 Hub Configuration (continued)
EEPROM
OFFSET
DESCRIPTION
DEFAULT
2Ch Max Power (Self) Register (MAXPS)
01h
Value in 2mA increments that the Hub consumes from an upstream port (VBUS) when
operating as a self-powered hub. This value includes the hub silicon along with the
combined power consumption (from VBUS) of all associated circuitry on the board.
This value also includes the power consumption of a permanently attached peripheral
if the hub is configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
Note: The USB2.0 Specification does not permit this value to exceed 100mA.
2Dh Max Power (Bus) Register (MAXPB)
00h
Value in 2mA increments that the Hub consumes from an upstream port (VBUS) when
operating as a bus-powered hub. This value includes the hub silicon along with the
combined power consumption (from VBUS) of all associated circuitry on the board.
This value also includes the power consumption of a permanently attached peripheral
if the hub is configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
2Eh
Hub Controller Max Current (Self) Register (HCMCS)
01h
Value in 2mA increments that the Hub consumes from an upstream port (VBUS) when
operating as a self-powered hub. This value includes the hub silicon along with the
combined power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently attached
peripheral if the hub is configured as a compound device.
Note: The USB2.0 Specification does not permit this value to exceed 100mA.
2Fh
Hub Controller Max Current (Bus) Register (HCMCB)
00h
Value in 2mA increments that the Hub consumes from an upstream port (VBUS) when
operating as a bus-powered hub. This value includes the hub silicon along with the
combined power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently attached
peripheral if the hub is configured as a compound device.
30h
Power-on Time Register (PWRT)
32h
The length of time that it takes (in 2mS intervals) from the time the host initiated
power-on sequence begins on a port until power is good on that port. System software
uses this value to determine how long to wait before accessing a powered-on port.
31h
Boost_Up Register (BOOSTUP)
00h
Refer to Table 3.7, “Boost_Up Register (BOOSTUP) Format,” on page 33 for details.
32h
Boost_5 Register (BOOST5)
00h
Refer to Table 3.8, “Boost_5 Register (BOOST5) Format,” on page 33 for details.
33h
Boost_4:2 Register (BOOST42)
00h
Refer to Table 3.9, “Boost_4:2 Register (BOOST42) Format,” on page 34 for details.
34h
RESERVED
00h
Revision 1.2 (02-29-12)
26
DATASHEET
SMSC LAN9514/LAN9514i