VT6508 datasheet(6/48 Pages) ETC1

6 / 48 page

VIA Technologies, Inc.

Preliminary VT6508 Datasheet

FEATURES

Single chip 8 ports 10/100Mbps Ethernet switch controller

Highly integrated single chip shared memory switch engine

Supports 8 RMII (Reduced Media Independent Interface) ports

Non-blocking layer 2 switch, 148,810 packets/sec on each 100Mbps Ethernet port

Media Access Control (MAC)

Dual 64-byte FIFO’s per port for receiving and transmitting

Auto-sensing 10/100Mbps media speed, full/half -duplex mode, and flow-control

capability

Two switching mechanisms

Supports ‘store and forward’ switching with filtering CRC-bad packets

Supports ‘cut through’ switching subject to long packets of length over 64 bytes

Packet buffering

Glueless 32-bit interface to SSRAM as a packet buffer pool

64 packet buffers for 32Kx32 SSRAM, 149 packet buffers for 64Kx32 SSRAM

1536 bytes for each packet buffer

Storing control data (forwarding table and packet link entries) in external SSRAM

Buffer status is stored in the internal free-buffer bit map registers

Shared forwarding table of 2K entries (or 4K slots) to support multiple (up to 4K)

Mac addresses per port

Efficient address recognition, self learning, and auto-aging mechanism

Two-slot hashing algorithm to prevent hash collision

Two optional hashing algorithms, CRC-map and direct-map

Advanced congestion control mechanism

IEEE 802.3X compliant flow control for full duplex ports

Backpressure for half duplex ports

Drop control for full duplex ports without flow control capability

Incorporating with the output private buffering scheme to prevent HOL (head of line)

blocking

Supports port mirroring (Sniffer feature)

By-pass VLAN packets

Support port-based trunking

Support two individual trunk groups, each of 2 member ports

Load balance according to DMAC address and source port number

Support chip initialization through EEPROM or by strapping only

Supports I

2C EEPROM interface for customized configuration

Supports LED serial-out in the strapping-only initialization mode

50MHz internal reference clock rate

83~100MHz SSRAM clock rate, typically 83MHz

Single +3.3V supply, 0.3

µm TSMC CMOS technology

128-pin PQFP package

VT6508 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

VT6508 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers

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