VIA Atlantic II VT6526 Switch Controllers

Meeting the challenges of continually increasing data speeds, Ethernet networks provide a reliable, fast, upgradeable transfer medium accepted throughout the industry. As part of VIA's Atlantic Ethernet switch controller family, the VIA Atlantic II VT6526 is designed with small and medium sized businesses in mind, enabling next generation intelligent scalable switch solutions that are affordable across the market segment.

With non-blocking store-and-forward shared memory layer-2 control, the VIA VT6526 is equipped with 4Mbits of embedded SRAM and a high-performance switching engine that drives forwarding and filtering at full wire speed. The VIA VT6526 provides 24 10/100Mbps Base T/TX ports with SMII and SS-SMII interfaces for connection to three Octal PHY devices, making it ideal for a wide range of businesses to network with a large number of workstations. Two additional 10/100/1000Mbps 802.3z and 802.3ab compliant ports connect to copper or fiber optic Gigabit lines allowing ultra fast connections to high-speed Internet or other servers. All ports have SMI auto-polling to auto-configure transfer speed, duplex mode, and 802.3x flow control making for simple plug-and-play operation.

The VIA VT6526 supports a wide range of IEEE 802.1 and 802.3 standards providing advanced network management for improved performance and security. An easy-to-use Web-based management system with graphical interfaces adds convenience for network administrators in remote network control and configuration.

Designed for easy integration by system builders, the VIA VT6526 is available in a 208-pin LQFP package and can be configured to a wide range of options such as an intelligent switch solution with an ARM-7 processor, or a smart switch solution with an 8051 processor, to a dumb 24+2G switch solution using an EEPROM or strapping-only initialization.

Benefits of VIA Atlantic VT6526

Powerful
Equipped with 24 10/100Mbps ports, 2 Gigabit ports, and a high performance switching engine makes the VT6256 perfect for small and medium sized office applications

Feature-Rich
Head of line blocking (HOL) prevention and by-port Egress/Ingress bandwidth (rate) control along with support for a wide range of IEEE 802.1 and 802.3 standards provides improved performance and security, and the user-friendly Web-based management system enables more convenient network administration.

Flexible
Supporting the latest Ethernet technologies, the VIA VT6526 can be configured in intelligent, smart, or dumb switch configurations. Further the VIA VT6526 supports both copper and fiber optic Gigabit lines giving system designers a wider range of options.

Easy to Integrate
Multiple configuration options with interfaces for Octal PHY devices and SERDES transceivers, and an 8/16-bit CPU interface to facilitates integration of 8051 or ARM-7 processors.

Key Features

» Single-chip non-blocking store-and-forward shared-memory layer-2 Ethernet switched controller
» 24 10/100Mbps Base T/TX ports
» 2 10/100/1000Mbps Base-T ports
» 4 Mbit embedded memory for packet buffers and control data
» High-performance switching engine performs forwarding and filtering at full wire speed
» SMI auto-polling for configuring speed, duplex mode, and 802.3x flow control for plug and play operation on each port.
» SMII and SS-SMII interface to connect three Octal PHY devices
» Two 802.3z and 802.3ab compliant Gigabit Ethernet ports with GMII interface
» Supports asynchionous CPU interface for 8/16 bit IDE, ARM with DMA (single/block/demand mode), 80186 with DMA (single/block mode) for management and SOHO router application
» Head of Line (HOL) blocking prevention and broadcast storm filtering
» By-port Egress/Ingress bandwidth (rate) control
» Supports a wide range of IEEE standards
  - 802.1p Class of Service with 2-level priority queuing
  - 802.1Q tag-based VLAN, port-based VLAN
  - 802.1v protocol-based VLAN classification
  - 802.1x network access control
  - 802.1s Multiple spanning trees 
  - 802.1w Fast address migration for rapid reconfiguration
  - 802.3ad port trunking with flexible load distribution control and fail-over function
» Internal oscillator and PLL (only low-cost 25MHz XTAL required)
» Provides 29 counters per port to support MIB II-RFC1213 (RMON Groups 1, 2, 3, 9), RFC1493(Bridge MIB), RFC1643(Ether-Like MIB)
» 2.5V core, 3.3V pad, 0.22µm CMOS process
» 208-pin LQFP package with EDHS to facilitate power spreading