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| PMC-Sierra,Inc. Preliminary * Filtering and switching at wire rates (up to 148,8000 packets per second), supporting a mix of Ethernet and IEEE 802.3 protocols. * Expansion port supports a peak system bandwidth of 1 Gbit/s, and is compatible with industry-standard PCI bus (version 2.1). * Performs all address learning, address table management, and aging functions for up to 32,768 MAC addresses (limited by external memory). Address learning rate of up to 10,000 addresses per second. * Maximum broadcast/multicast at wire rates with configurable broadcast storm rate limiting. * Low-latency operation in both unicast and broadcast modes. * Configuration, management, MIB statistics, and diagnostics available inband. * Store-and-forward operation with full error checking and filtering. PM3351 ELAN 1x100 * Flow control supported for both fullduplex and half-duplex operation; supports IEEE 802.3x PAUSE frame flow control in full-duplex mode, and supports user-enabled backpressure flow control in half-duplex mode. * Maintains and collects per-port and per-host statistics at wire rates. * Interfaces directly to industry-standard 100 Mbit/s transceivers with no glue logic via the built-in Medium Independent Interface (MII) port with full support for the autonegotiation function implemented by the PHY devices. * Fully static CMOS operation at 50 MHz clock rates. * Implemented with a 3.3 V core and a 5 V-compatible I/O. * Available in a 208-pin PQFP package. Single-Port 10/100 Mbit/s Ethernet Switch FEATURES * Single-chip, 1-port, full-duplex or halfduplex, 10/100BaseT switching device for low-cost unmanaged and managed networks. * On-chip SmartPathTM 50 MHz RISC CPU core, multi-channel DMA controller, MAC-layer interface logic, FIFOs, PCI-based expansion port, and a flexible memory controller. * CPU supports background applications running on local OS (e.g., SNMP), and real-time data-oriented applications (e.g., packet forwarding and filtering decisions). * Performs packet switching at a rate of 200 Mbit/s (full-duplex) or 100 Mbit/s (half-duplex). * Fully compatible with the PM3350 8-port 10 Mbit/s switch device; may be used to create a compact and inexpensive mixed 10/100 Mbit/s switching hub. BLOCK DIAGRAM 50 MHz Embedded RISC CPU I D Cache Cache PCI Expansion Bus PCI Bus Interface Transmit Channel Logic Receive DMA Controller Transmit FIFO Receive FIFO 100BaseT Transmit MAC 100BaseT Receive MAC 100BaseT MII Interface Expansion Registers External Memory Interface SRAM/EPROM PMC-970278 (P4) (c)A1998 PMC-Sierra, Inc. October, 1998 Preliminary PM3351 ELAN 1x100 Single-Port 10/100 Mbit/s Ethernet Switch TYPICAL APPLICATION LOW-COST 10/100 Mbit/s ETHERNET SWITCH The ELAN 1x100 chip is used to build low-cost 10/100 Mbit/s switches for server/backbone applications. A switch can be created from the following: * PM3351s (one for every 100 Mbit/s port required), * one to seven PM3350s (one for every eight 10 Mbit/s ports required), * a bank of memory per device (60 ns EDO DRAM for each PM3350, * 15 ns SRAM for each PM3351) for holding frame buffers and switching tables, * a single 256k x 8-bit EPROM or EEPROM (initialization, configuration, and SNMP support firmware), * quad 10BaseT interface adapters (LXT944) for the PM3350s, * one 100 Mbit/s PHY device per PM3351, and * appropriate passive components. A block diagram of a typical 32-port 10BaseT stackable switch with two 10/100 Mbit/s ports is shown. The PCI expansion bus is used to seamlessly connect the ELAN 8x10s and ELAN 1x100s. 8x10BaseT Quad PHY Quad PHY 8x10BaseT Quad PHY Quad PHY 10/100BaseT 10/100 PHY EDO DRAM EDO DRAM PM3350 @G6IA' PM3350 @G6IA' PM3351 @G6IA [ PCI Backplane EEPROM EDO DRAM PM3350 @G6IA' SRAM PM3350 @G6IA' EDO DRAM PM3351 @G6IA [ Quad PHY Quad PHY Quad PHY Quad PHY 10/100 PHY 10/100BaseT 8x10BaseT 8x10BaseT Head Office: PMC-Sierra, Inc. #105 - 8555 Baxter Place Burnaby, B.C. V5A 4V7 Canada Tel: 604.415.6000 Fax: 604.415.6200 To order documentation, send email to: document@pmc-sierra.com or contact the head office, Attn: Document Coordinator All product documentation is available on our web site at: http://www.pmc-sierra.com For corporate information, send email to: info@pmc-sierra.com PMC-970278 (P4) (c) 1998 PMC-Sierra, Inc. October, 1998 SmartPath is a trademark of PMC-Sierra, Inc. SRAM |
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