Overview The ADM6996F is a high performance, low cost, highly integrated (Controller, PHY and Memory) four-port 10/100 Mbps TX/FX plus two 10/100 MAC port Ethernet switch controller with all ports supporting 10/100 Mbps Full/Half duplex. The ADM6996F is intended for applications to stand alone bridge for low cost SOHO markets such as 5Port, Router applications. The 2 nd MAC can be configured as PCS type MII with 10/100 PHY integrated. ADM6996F provides the most advance functions such as: 802.1p(Q.O.S.), 802.1q(VLAN), Port MAC address Locking, Management, Port Status, TP AutoMDIX, 25M Crystal & Extra MII port functions to meet customer requests on Switch demand. The ADM6996F also supports Back Pressure in Half-Duplex mode and 802.3x Flow Control Pause packet in Full-Duplex mode to prevent packet loss when buffers are full. When Back Pressure is enabled, and there is no receive buffer available for the incoming packet, the ADM6996F will issue a JAM pattern on the receiving port in Half Duplex mode and transmit the 802.3x Pause packet back to receiving end in Full Duplex mode. The built-in SRAM used for the packet buffer and address learning table is divided into 256 bytes/block to achieve the optimized memory utilization through complicated link list on packets with various lengths. ADM6996F also supports priority features by Port-Base, VLAN and IP TOS field checking. Users can easily set different priority modes in individual ports, through a small low-cost micro controller to initialize or on-the-fly to configure. Each output port supports four queues in the way of fixed N: 1 fairness queuing to fit the bandwidth demand on various types of packet such as Voice, Video and data. 802.1Q, Tag/Untag, and up to 16 groups of VLAN are also supported. An intelligent address recognition algorithm allows ADM6996F to recognize up to 2048 different MAC addresses and enables filtering and forwarding at full wire speed. Port MAC address Locking function is also supported by ADM6996F to use on Building Internet access to prevent multiple users sharing one port traffic.
Features ? Supports four 10M/100M auto-detect Half/Full duplex switch ports with TX/FX interfaces and two MII/GPSI ports. ? Supports 2048 MAC addresses table. ? Supports four queue for QoS ? Supports priority features by Port-Based, 802.1p VLAN & IP TOS of packets. ? Supports Store & Forward architecture and performs forwarding and filtering at nonblocking full wire speed. ? Supports buffer allocation with 256 bytes per block ? Supports Aging function Enable/Disable. ? Supports per port Single/Dual color mode with Power On auto diagnostic. ? Supports 802.3x Flow Control pause packet for Full Duplex in case buffer is full. ? Supports Back Pressure function for Half Duplex operation in case buffer is full. ? Supports packet lengths up to 1522 bytes. ? Broadcast Storming Filter function. ? Supports 802.1Q VLAN. Up to 16 VLAN groups are implemented by the last four bits of VLAN ID. ? 2bit MAC clone to support multiple WAN application ? Supports TP interface Auto MDIX function for auto TX/RX swap by strapping-pin. ? Easy Management 32bits smart counter for per port RX/TX byte/packet count, error count and collision count. ? Supports PHY status output for management system. ? 25M Crystal only for the whole system. ? 128 QFP package with 0.18um technology. 1.8V/3.3V power supply.
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