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USB Hub with Integrated 10/100 Ethernet Controller
Datasheet
SMSC LAN9512 25 Revision 1.0 (04-20-09)
DATASHEET
2Eh Hub Controller Max Current (Self) Register (HCMCS)
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.
01h
2Fh Hub Controller Max Current (Bus) Register (HCMCB)
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.
00h
30h Power-on Time Register (PWRT)
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.
32h
31h Boost_Up Register (BOOSTUP)
Refer to Table 3.7, “Boost_Up Register (BOOSTUP) Format,” on page 30 for details.
00h
32h RESERVED 00h
33h Boost_3:2 Register (BOOST32)
Refer to Table 3.8, “Boost_3:2 Register (BOOST32) Format,” on page 30 for details.
00h
34h RESERVED 00h
35h Port Swap Register (PRTSP)
Swaps the Upstream and Downstream USB DP and DM pins for ease of board routing
to devices and connectors.
0 = USB D+ functionality is associated with the DP pin and D- functionality is
associated with the DM pin.
1 = USB D+ functionality is associated with the DM pin and D- functionality is
associated with the DP pin.
Bit 7 = RESERVED
Bit 6 = RESERVED
Bit 5 = RESERVED
Bit 4 = RESERVED
Bit 3 = 1; Port 3 DP/DM is swapped
Bit 2 = 1; Port 2 DP/DM is swapped
Bit 1 = RESERVED
Bit 0 = 1; Upstream Port DP/DM is swapped
00h
Table 3.3 Hub Configuration (continued)
EEPROM
OFFSET DESCRIPTION DEFAULT