Smsc LAN9512 User Manual download pdf (Page 25)

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

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 45 46

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Smsc LAN9512 User Manual Page 25

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