USB to LAN

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Description

The AX88760 is a high performance and highly integrated USB/Ethernet and USB/USB connectivity solution which contains an USB 2.0 hub, three downstream USB 2.0 transceivers, an upstream USB 2.0 transceiver, 10/100M Ethernet PHY, 10/100M Ethernet MAC, EEPROM controller, and SRAM. The AX88760 is targeted for many applications such as desktops, notebook PCs, Ultra-Mobile PCs, docking stations, game consoles, multifunction printers, digital-home appliances, and any embedded systems using a standard USB port. Recent innovations in multimedia SoCs have utilized shrinking physical form factors to reduce costs. The most efficient method of miniaturization is to reduce pin count and use a serial interface like USB, allowing the use of a USB-to-LAN solution, as opposed to a parallel local/memory bus. By combining the AX88760 with a USB host microcontroller, designers can provide Ethernet and multi-port USB connectivity for embedded systems to control remotely over a network and expand USB ports. The AX88760's integrated USB hub is fully compliant with USB 2.0 Specification and supports Low-Speed, Full-Speed, and High-Speed downstream devices on all of the enabled downstream ports. The AX88760 implements multiple TT architecture that provides dedicated TT to each downstream (DS) ports, which guarantee Full-Speed (FS) data passing bandwidth when multiple FS device perform heavy loading operations. The AX88760 provides full hub features such as (1) One suspend LED indicator and three downstream port status LED indicators, (2) Individual/Gang mode power management scheme and over-current detection for downstream ports, and (3) Non-removable declaration configured by I/O pin during power-on reset...etc The AX88760 integrates on-chip Fast Ethernet MAC and PHY, which is IEEE802.3 10Base-T and IEEE802.3u 100Base-TX compatible, and embedded SRAM for packet buffering to accommodate high bandwidth applications. The AX88760 has a wide array of features including support for Auto-MDIX, Wake-on-LAN power management, and IEEE 802.3x and backpressure flow control. USB 2.0 MTT Hub Fully compliant with Universal Serial Bus Specification Revision 2.0 Supports USB HS (480Mbps), FS(12Mbps) and LS (1.5Mbps) modes Three downstream ports and one upstream port with integrated USB 2.0 transceivers Multiple Transaction Translator (MTT) provides respective TT control logics for each downstream port Supports one suspend LED indicator and three downstream port status LED indicator On-chip 8-bit micro-processor (6 MIPS @12MHz) with 64-byte RAM and 2K internal ROM Built-in upstream port 1.5KΩ pull-up and downstream port 15KΩ pull-down resistors Supports both individual and gang modes of power management and over-current detection for downstream ports Supports compound-device (non-removable in downstream ports) by I/O pin configuration Improves output drivers with slew-rate control for EMI reduction Internal power-fail detection for ESD recovery 10/100M Fast Ethernet Controller Integrates 10/100Mbps Fast Ethernet MAC/PHY IEEE 802.3 10Base-T/100Base-TX compatible Supports twisted pair crossover detection and auto-correction (Auto-MDIX) Embeds SRAM for packet buffering Supports both Full-duplex with flow control and Half-duplex with backpressure operation Supports 2 VLAN ID filtering, received VLAN Tag (4 bytes) can be stripped off or preserved MAC/PHY loop-back diagnostic capability Support Wake-on-LAN Function Supports Suspend mode and Remote Wakeup via Link-up, Magic packet, MS wakeup frame and external pin Optional PHY power down during Suspend mode High performance packet transfer rate over USB bus using proprietary burst transfer mechanism (US Patent Approval) Supports USB to Ethernet bridging or vice versa in hardware Supports 256/512 bytes (93c56/93c66) of serial EEPROM (for storing USB Descriptors for USB to LAN function) Supports automatic loading of Ethernet ID, USB Descriptors and Adapter Configuration from EEPROM after power-on initialization Integrates on-chip voltage regulator and only requires a single 3.3V power supply 12MHz and 25Mhz clock input from either crystal or oscillator source Integrates on-chip power-on reset circuit Package type with 100-pin LQFP RoHS compliant package Operating temperature range: 0°C to 70°C

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