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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.