USB Hub with Integrated 10/100 Ethernet Controller

Datasheet

Table 3.3 Hub Configuration (continued)

EEPROM

 

 

OFFSET

DESCRIPTION

DEFAULT

 

 

 

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 31 for details.

 

 

 

 

32h

Boost_5 Register (BOOST5)

00h

 

Refer to Table 3.8, “Boost_5 Register (BOOST5) Format,” on page 31 for details.

 

 

 

 

33h

Boost_4:2 Register (BOOST42)

00h

 

Refer to Table 3.9, “Boost_4:2 Register (BOOST42) Format,” on page 32 for details.

 

 

 

 

34h

RESERVED

00h

 

 

 

35h

Port Swap Register (PRTSP)

00h

 

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 = 1; Port 5 DP/DM is swapped

 

 

Bit 4 = 1; Port 4 DP/DM is swapped

 

 

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

 

 

 

 

SMSC LAN9514

25

Revision 1.0 (04-20-09)

 

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