features ? supports four 10/100/1000 mbps ethernet ports with gmii/mii interface ieee 802.3ab csma/cd compliant full and half duplex mode of operation speed and duplex mode auto-negotiation through mdio self-address learning mechanism supports 512-mac addresses automatic address aging with 300 seconds default 512-kbit packet buffer memory embedded serial port interface employed to communicate with mcu ieee 802.3ab flow control for full duplex operation supports store-and-forward mode of operation 0.18 micron, 1.8v cmos technology packaged in 160-pin pqfp 3.3v i/o available in a variety of packages depending on customer requirements description this layer 2 switch provides an ideal solution for the design of unmanaged full wire- speed multi-port gigabit ethernet (gbe) switches. each port supports either 10/100/1000 mbps data rate. flow controls, back pressure in half-duplex mode and pause frame in full-duplex mode are employed to solve the hol (head of line) blocking. this layer 2 switch integrates four half/full duplex mode 1000 base gigabit ethernet macs, wire speed switching engines, mac address based address parsing algorithms and packet buffer memory. figure 1. ethernet level 2 switch block diagram switch fabric request control signals switch core address parse module packet buffer (48 kbyte) management interface (spi, mdio) mux datarate fifo gmi mii gmii rxd (rx_clk) txd_ng (tx_clk) txd_g (sysclk) mac0, 1, 2 & 3 spi/mdio address port num packet out packet in ack 4-port layer 2 10/100/1000mbps unmanaged switched ethernet controller AT79C1020 summary note: this is a summary document. a complete document is available under nda. for more information, please con- tact your local atmel sales office. 3434bs?netst?3/04
printed on recycled paper. disclaimer: atmel corporation makes no warranty for the use of its products, other than those expressly contained in the company?s standar d warranty which is detailed in atmel?s terms and conditions located on the company?s web site. the company assumes no responsibi lity for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time wi thout notice, and does not make any commitment to update the information contained her ein. no licenses to patents or other intellectual property of atmel are granted by the company in connection with the sale of atmel products , expressly or by implication. atmel?s products are not aut horized for use as critical components in life support devices or systems. atmel corporation atmel operations 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 487-2600 regional headquarters europe atmel sarl route des arsenaux 41 case postale 80 ch-1705 fribourg switzerland tel: (41) 26-426-5555 fax: (41) 26-426-5500 asia room 1219 chinachem golden plaza 77 mody road tsimshatsui east kowloon hong kong tel: (852) 2721-9778 fax: (852) 2722-1369 japan 9f, tonetsu shinkawa bldg. 1-24-8 shinkawa chuo-ku, tokyo 104-0033 japan tel: (81) 3-3523-3551 fax: (81) 3-3523-7581 memory 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 microcontrollers 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 la chantrerie bp 70602 44306 nantes cedex 3, france tel: (33) 2-40-18-18-18 fax: (33) 2-40-18-19-60 asic/assp/smart cards zone industrielle 13106 rousset cedex, france tel: (33) 4-42-53-60-00 fax: (33) 4-42-53-60-01 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 scottish enterprise technology park maxwell building east kilbride g75 0qr, scotland tel: (44) 1355-803-000 fax: (44) 1355-242-743 rf/automotive theresienstrasse 2 postfach 3535 74025 heilbronn, germany tel: (49) 71-31-67-0 fax: (49) 71-31-67-2340 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 biometrics/imaging/hi-rel mpu/ high speed converters/rf datacom avenue de rochepleine bp 123 38521 saint-egreve cedex, france tel: (33) 4-76-58-30-00 fax: (33) 4-76-58-34-80 literature requests www.atmel.com/literature 3434bs?netst?3/04 ? atmel corporation 2004 . all rights reserved. atmel ? and combinations thereof, are the registered trademarks of atmel corporation or its subsidiaries. other terms and product nam es may be the trademarks of others.
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