USB Hub with Integrated 10/100 Ethernet Controller

Datasheet

Table 2.3 Miscellaneous Pins (continued)

NUM

 

 

BUFFER

 

PINS

NAME

SYMBOL

TYPE

DESCRIPTION

 

 

 

 

 

 

 

 

Ethernet Link

nLNKA_LED

OD12

This pin is driven low (LED on) when a valid link is

 

 

Activity Indicator

 

(PU)

detected. This pin is pulsed high (LED off) for

 

 

LED

 

 

80mS whenever transmit or receive activity is

 

 

 

 

 

detected. This pin is then driven low again for a

 

 

 

 

 

minimum of 80mS, after which time it will repeat

 

 

 

 

 

the process if TX or RX activity is detected.

1

 

 

 

 

Effectively, LED2 is activated solid for a link. When

 

 

 

 

 

transmit or receive activity is sensed, LED2 will

 

 

 

 

 

function as an activity indicator.

 

 

General

GPIO1

IS/O12/

This General Purpose I/O pin is fully programmable

 

 

Purpose I/O 1

 

OD12

as either a push-pull output, an open-drain output,

 

 

 

 

(PU)

or a Schmitt-triggered input.

 

 

 

 

 

 

 

 

Ethernet Speed

nSPD_LED

OD12

This pin is driven low (LED on) when the Ethernet

 

 

Indicator LED

 

(PU)

operating speed is 100Mbs, or during auto-

 

 

 

 

 

negotiation. This pin is driven high during 10Mbs

1

 

 

 

 

operation, or during line isolation.

 

 

 

 

 

 

 

General

GPIO2

IS/O12/

This General Purpose I/O pin is fully programmable

 

 

Purpose I/O 2

 

OD12

as either a push-pull output, an open-drain output,

 

 

 

 

(PU)

or a Schmitt-triggered input.

 

 

 

 

 

 

 

 

General

GPIO3

IS/O8/

This General Purpose I/O pin is fully programmable

1

 

Purpose I/O 3

 

OD8

as either a push-pull output, an open-drain output,

 

 

 

 

(PU)

or a Schmitt-triggered input.

 

 

 

 

 

 

 

 

General

GPIO4

IS/O8/

This General Purpose I/O pin is fully programmable

1

 

Purpose I/O 4

 

OD8

as either a push-pull output, an open-drain output,

 

 

 

 

(PU)

or a Schmitt-triggered input.

 

 

 

 

 

 

 

 

General

GPIO5

IS/O8/

This General Purpose I/O pin is fully programmable

1

 

Purpose I/O 5

 

OD8

as either a push-pull output, an open-drain output,

 

 

 

 

(PU)

or a Schmitt-triggered input.

 

 

 

 

 

 

 

 

General

GPIO6

IS/O8/

This General Purpose I/O pin is fully programmable

1

 

Purpose I/O 6

 

OD8

as either a push-pull output, an open-drain output,

 

 

 

 

(PU)

or a Schmitt-triggered input.

 

 

 

 

 

 

 

 

General

GPIO7

IS/O8/

This General Purpose I/O pin is fully programmable

1

 

Purpose I/O 7

 

OD8

as either a push-pull output, an open-drain output,

 

 

 

 

(PU)

or a Schmitt-triggered input.

 

 

 

 

 

 

 

 

Detect

VBUS_DET

IS_5V

This pin detects the state of the upstream bus

 

 

Upstream

 

 

power. The Hub monitors VBUS_DET to determine

 

 

VBUS Power

 

 

when to assert the USBDP0 pin's internal pull-up

 

 

 

 

 

resistor (signaling a connect event).

1

 

 

 

 

For bus powered hubs, this pin must be tied to

 

 

 

 

 

 

 

 

 

 

VDD33IO.

 

 

 

 

 

For self powered hubs, refer to the LAN9512

 

 

 

 

 

reference schematics.

 

 

 

 

 

 

 

 

Auto-MDIX

AUTOMDIX_EN

IS

Determines the default Auto-MDIX setting.

1

 

Enable

 

 

0 = Auto-MDIX is disabled.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 = Auto-MDIX is enabled.

 

 

 

 

 

 

1

 

Test 1

TEST1

-

Used for factory testing, this pin must always be left

 

 

 

 

unconnected.

 

 

 

 

 

 

SMSC LAN9512

11

Revision 1.0 (04-20-09)

 

DATASHEET