LAN9514 datasheet(29/54 Pages) MICROCHIP

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DS00002306A-page 29

LAN9514/LAN9514I

2:1

Over Current Sense (CURRENT_SNS)

Selects current sensing on a port-by-port basis, all ports ganged, or none (only for

bus-powered hubs) The ability to support current sensing on a port or ganged basis

is hardware implementation dependent.

00 = Ganged sensing (all ports together)

01 = Individual port-by-port

1x = Over current sensing not supported (must only be used with Bus- Powered

configurations!)

01b

Port Power Switching (PORT_PWR)

Enables power switching on all ports simultaneously (ganged), or port power

is individually switched on and off on a port by port basis (individual). The

ability to support power enabling on a port or ganged basis is hardware

implementation dependent.

0 = Ganged switching (all ports together)

1 = Individual port by port switching

TABLE 3-5:

CONFIG DATA BYTE 2 REGISTER (CFG2) FORMAT

BITS

DESCRIPTION

DEFAULT

7:6

RESERVED

00b

5:4

Over Current Timer (OC_TIMER)

Over Current Timer delay

00 = 50 ns

01 = 100 ns (This is the recommended value)

10 = 200 ns

11 = 400 ns

01b

Compound Device (COMPOUND)

Allows the OEM to indicate that the Hub is part of a compound (see the USB

Specification for definition) device. The applicable port(s) must also be defined as

having a “Non-Removable Device”.

0 = No

1 = Yes, Hub is part of a compound device

2:0

RESERVED

000b

TABLE 3-6:

CONFIG DATA BYTE 3 REGISTER (CFG3) FORMAT

Bits

Description

Default

7:4

RESERVED

TABLE 3-4:

CONFIG DATA BYTE 1 REGISTER (CFG1) FORMAT (CONTINUED)

Bits

Description

Default

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