SR9900 100 m Ethernet is a USB2.0 interface chip, the miniaturization QFN24 encapsulation, in line with the USB device class - the CDC - the ECM, because it is a USB - CDC - ECM devices, so in most of the embedded system is the existence of equivalent to avoid flooding, are widely used in the embedded system design of Ethernet ~

SR9900 is a high level of integration, low power consumption, single chip USB 2.0 m 10/100 Ethernet control circuit, low cost increase for various applications, small packaging, plug and play function of fast Ethernet, can be used for desktop computer, sum the computers, laptops, tablets, bracket/port replicator/docking stations, game consoles, intelligent household and any embedded devices with USB interface,
SR9900 internal integration USB 2.0 transceiver, based on the IEEE802.3 and 10/100 of the IEEE802.3 az - 2010 - m Ethernet module, as well as efficient memory control module,
SR9900 fully compatible with Microsoft NDIS5, NDIS6 (IPv4 and IPv6, TCP, UDP) Checksum features, and support the IEEE802 IP2 layer priority coding, and ieee802.1q virtual network (VLAN),

? Single chip usb transfer 10/100 m fast Ethernet controller
? USB device interface
? Integrated USB2.0 transceiver, in line with the USB2.0 protocol
? Support USB at full speed and high-speed mode
? Rapid 10/100 m Ethernet interface
? Integrated 10/100 m fast Ethernet MAC and PHY module
? Compatible with the IEEE 802.3 100 base - 10 base-t/TX
? Compatible with the IEEE 802.3 100 base - FX
? Automatic consultation function
? Support the twisted-pair exchange, polarity, phase shift correction
? Cable cross detection and automatic correction
? Support network without oscillation awaken
? Built-in TX/RX packet buffer
? Built-in IPv4/IPv6 packet check and carrying engine, support IPv4 IGMP, TCP/IP/UDP/ICMP/IPv6 TCP/UDP/ICMPv6 packet check to generate and check
? Supports full duplex IEEE 802.3 x flow control and pressure back half duplex conflict flow control
? Support the IEEE 802.1 Q VLAN tag
? Support the IEEE 802.3 az - 2010 (EEE)

? Support network remote wake-up function
? Support sleep mode
? Support link state changes through the network, the magic bag, Microsoft sensei bag events such as remote sensei
? Support Protocol Offloads (ARP and NS)
? Dormancy mode to choose close PHY power supply network low power or
? Advanced power management feature
? Support for dynamic power management to save in the condition of no load or light load power consumption
? Support the IEEE 802.3 az - 2010 (EEE) energy saving mode
? Support sleep mode when the extremely low power sleep mode
? Support through GPIO pin to disable the network function
? Support the SPI Flash block and serial EEPROM
? Support the CDC - ECM
? Built-in OTP memory, can online update USB device descriptor set
? A single 25 MHZ clock input, support crystals and pxo
? Single 5.0 V power supply, internal integration voltage conversion circuit
? Support LED flicker frequency and duty ratio can be set up
? The accord with RoHS standard small QFN24-04 x04 encapsulation

With the continuous development of embedded and Internet of things, a lot of industry can use this type of chip ~ we recommend ~