Smsc LAN9512 User Manual download pdf (Page 7)

USB Hub with Integrated 10/100 Ethernet Controller

Datasheet

SMSC LAN9512 7 Revision 1.0 (04-20-09)

DATASHEET

1.1.2 USB Hub

The integrated USB hub is fully compliant with the USB 2.0 Specification and will attach to a USB host

as a Full-Speed Hub or as a Full-/High-Speed Hub. The hub supports Low-Speed, Full-Speed, and

High-Speed (if operating as a High-Speed hub) downstream devices on all of the enabled downstream

ports.

A dedicated Transaction Translator (TT) is available for each downstream facing port. This architecture

ensures maximum USB throughput for each connected device when operating with mixed-speed

peripherals.

The hub works with an external USB power distributed switch device to control V

BUS

switching to

downstream ports, and to limit current and sense over-current conditions.

All required resistors on the USB ports are integrated into the hub. This includes all series termination

resistors on D+ and D- pins and all required pull-down and pull-up resistors on D+ and D- pins. The

over-current sense inputs for the downstream facing ports have internal pull-up resistors.

Two external ports are available for general USB device connectivity.

1.1.3 Ethernet Controller

The 10/100 Ethernet controller provides an integrated Ethernet MAC and PHY which are fully IEEE

802.3 10BASE-T and 802.3u 100BASE-TX compliant. The 10/100 Ethernet controller also supports

numerous power management wakeup features, including “Magic Packet”, “Wake on LAN” and “Link

Status Change”. These wakeup events can be programmed to initiate a USB remote wakeup.

The 10/100 Ethernet PHY integrates an IEEE 802.3 physical layer for twisted pair Ethernet

applications. The PHY block includes support for auto-negotiation, full or half-duplex configuration,

auto-polarity correction and Auto-MDIX. Minimal external components are required for the utilization of

the integrated PHY.

The Ethernet controller implements four USB endpoints: Control, Interrupt, Bulk-in, and Bulk-out. The

Bulk-in and Bulk-out Endpoints allow for Ethernet reception and transmission respectively.

Implementation of vendor-specific commands allows for efficient statistics gathering and access to the

Ethernet controller’s system control and status registers.

1.1.4 EEPROM Controller

The LAN9512 contains an EEPROM controller for connection to an external EEPROM. This allows for

the automatic loading of static configuration data upon power-on reset, pin reset, or software reset.

The EEPROM can be configured to load USB descriptors, USB device configuration, and the MAC

address.

1.1.5 Peripherals

The LAN9512 also contains a TAP controller, and provides three PHY LED indicators, as well as eight

general purpose I/O pins. All GPIOs can serve as remote wakeup events when LAN9512 is in a

suspended state.

The integrated IEEE 1149.1 compliant TAP controller provides boundary scan via JTAG.

1.1.6 Power Management

The LAN9512 features three variations of USB suspend: SUSPEND0, SUSPEND1, and SUSPEND2.

These modes allow the application to select the ideal balance of remote wakeup functionality and

power consumption.

 SUSPEND0: Supports GPIO, “Wake On LAN”, and “Magic Packet” remote wakeup events. This

suspend state reduces power by stopping the clocks of the MAC and other internal modules.

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