USB Hub with Integrated 10/100 Ethernet Controller

Datasheet

Table 3.6 Config Data Byte 3 Register (CFG3) Format

BITS

DESCRIPTION

DEFAULT

 

 

 

7:4

RESERVED

0h

 

 

 

3

Port Re-Mapping Enable (PRTMAP_EN)

0b

 

Selects the method used by the Hub to assign port numbers and disable

 

 

ports.

 

 

0 = Standard Mode. The following EEPROM addresses are used to define

 

 

which ports are enabled. The ports mapped as Port’n’ on the Hub are

 

 

reported as Port’n’ to the host, unless one of the ports is disabled, then the

 

 

higher numbered ports are remapped in order to report contiguous port

 

 

numbers to the host.

 

 

EEPROM Address 2Ah: Port Disable for Self-Powered operation

 

 

EEPROM Address 2Bh: Port Disable for Bus-Powered operation

 

 

1 = Port Re-Map mode. The mode enables remapping via the following

 

 

EEPROM addresses:

 

 

EEPROM Address 36h: Port Remap 12

 

 

EEPROM Address 37h: Port Remap 34

 

 

EEPROM Address 38h: Port Remap 5

 

 

 

 

2:0

RESERVED

000b

 

 

 

Table 3.7 Boost_Up Register (BOOSTUP) Format

BITS

 

DESCRIPTION

DEFAULT

 

 

 

7:2

RESERVED

000000b

 

 

 

1:0

Upstream USB Electrical Signaling Drive Strength Boost Bit for

00b

 

Upstream Port A (BOOST_IOUT_A)

 

 

00

= Normal electrical drive strength

 

 

01

= Elevated electrical drive strength (+4% boost)

 

 

10

= Elevated electrical drive strength (+8% boost)

 

 

11 = Elevated electrical drive strength (+12% boost)

 

 

 

 

 

Table 3.8 Boost_5 Register (BOOST5) Format

BITS

 

DESCRIPTION

DEFAULT

 

 

 

7:2

RESERVED

000000b

 

 

 

1:0

Upstream USB Electrical Signaling Drive Strength Boost Bit for

00b

 

Downstream Port 5 (BOOST_IOUT_5)

 

 

00

= Normal electrical drive strength

 

 

01

= Elevated electrical drive strength (+4% boost)

 

 

10

= Elevated electrical drive strength (+8% boost)

 

 

11 = Elevated electrical drive strength (+12% boost)

 

 

 

 

 

SMSC LAN9514

31

Revision 1.0 (04-20-09)

 

DATASHEET