MVTX2804

The MVTX2800AG family is a group of 8-port 1000 Mbps non-blocking Ethernet switch chips with on-chip address memory. A single chip provides a maximum of eight 1000 Mbps ports and a dedicated CPU interface with a 16/8-bit bus for managed and unmanaged switch applications. The VTX2800 family consists of the following four products:

• VTX2804 8 Gigabit ports Managed
• VTX2803 8 Gigabit ports Unmanaged
• VTX2802 4 Gigabit ports Managed
• VTX2801 4 Gigabit ports Unmanaged

The MVTX2804AG supports up to 64K MAC addresses to aggregate traffic from multiple wiring closet stacks. The centralized shared-memory architecture allows a very high performance packet-forwarding rate of 11.904M packets per second at full wire speed. The chip is optimized to provide a low-cost, high performance workgroup, and wiring closet, layer 2 switching solution with 8 Gigabit Ethernet ports.

Two Frame Buffer Memory domains utilize cost effective, high-performance ZBT-SRAM with aggregated bandwidth of 16Gbps to support full wire speed on all external ports simultaneously.

With Strict priority, Delay Bounded, and WRR transmission scheduling, plus WRED memory congestion scheme, the chip provides powerful QoS functions for convergent network multimedia and mission-critical applications. The chip provides 8 transmission priorities and 2 level drop precedence. Traffic is assigned its transmission priority and dropping precedence based on the frame VLAN Tag priority or DS/TOS fields in IP packets.

IP multicast snooping provides up to 64k simultaneous IP Multicast groups. With 4K IEEE 802.1Q VLANs, the MVTX2804AG provides the ability to logically group users to control multicast traffic.

The MVTX2804AG supports port trunking/load sharing on the 1000 Mbps ports with fail-over capability. The port trunking/load sharing can be used to group ports between interlinked switches to increase the effective network bandwidth.

In full-duplex mode, IEEE 802.3x flow control is provided. The Physical Coding Sublayer (PCS) is integrated onchip to provide a direct 10-bit GMII interface, or the PCS can be bypassed to provide an interface to existing fiberbased Gigabit Ethernet transceivers.

Statistical information for Etherstat SNMP and Remote Monitoring Management Information Base (RMON MIB) are collected independently for each of the eight ports. Access to these statistical counter/registers is provided via the CPU interface. SNMP Management frames can be received and transmitted via the CPU interface, creating a complete network management solution.

The MVTX2804AG is fabricated using 0.25mm technology. Inputs, however, are 3.3V tolerant and the outputs are capable of directly interfacing to LVTTL levels. The MVTX2804AG is packaged in a 596-pin Ball Grid Array package.