LAN9514 datasheet(30/54 Pages) MICROCHIP

30 / 54 page

LAN9514/LAN9514I

DS00002306A-page 30

 2009-2016 Microchip Technology Inc.

Port Re-Mapping Enable (PRTMAP_EN)

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 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)

00b

TABLE 3-8:

BOOST_3:2 REGISTER (BOOST32) FORMAT

Bits

Description

Default

7:2

RESERVED

000000b

1:0

Upstream USB Electrical Signaling Drive Strength Boost Bit for 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)

00b

TABLE 3-6:

CONFIG DATA BYTE 3 REGISTER (CFG3) FORMAT (CONTINUED)

Bits

Description

Default

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