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AC208-DS01-R 数据表(PDF) 1 Page - Broadcom Corporation. |
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AC208-DS01-R 数据表(HTML) 1 Page - Broadcom Corporation. |
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1 / 58 page  PRELIMINARY DATA SHEET AC208 AC208-DS04-405-R 16215 Alton Parkway • P.O. Box 57013 • Irvine, California 92619-7013 • Phone: 949-450-8700 •Fax: 949-450-8710 07/08/02 2.5V 10/100-TX 8-Port Repeater/7+1 Uplink Port with Integrated Bridge Figure 1: Functional Block Diagram GENERAL DESCRIP T ION FE A T U R E S The AC208 is an unmanaged eight-port 10/100 Mbps repeater with an integrated bridge. The AC208 provides a low-cost and integrated solution for unmanaged repeater applications. The AC208 is a Class II Repeater. In addition, the eighth port supports 10/100 TX interface for uplink function. The AC208 provides 10/100 Mbps auto-negotiation and parallel detection for all ports. In addition, the option to configure each transceiver port via the EEPROM interface is available. The AC208 provides two internal repeater state machines, one operating at 10 Mbps and the other at 100 Mbps. Once the technology is set, the device automatically connects each port to the appropriate repeater segment. The AC208 provides two back-planes for expansion, one operates at 10 Mbps and the other operates at 100 Mbps. Up to 32 ports can logically be connected into one repeater using back-plane buses. The AC208 integrates repeater and bridge technologies with store-and-forward mechanisms. FE A T U R E S • Low-power (less than 1A total current consumption when used with 1.25:1 transformer) eight-port 10/100 Mbps repeater with built-in bridge function. • MDC/MDIO for control/status of transceiver components. • Eight integrated 10/100 Mbps IEEE 802.3u compliant transceivers. • IEEE 802.3u-compliant auto-negotiation. • Fully integrated adaptive equalizer provides phase/ amplitude compensation for various cable lengths up to 30 dB at 100 MHz. • Patent-pending DC restoration technique reduces offset/ baseline wander. • Unique scrambler seed for all ports for better EMI. • Cascadable backplanes compatible with AC206. • Non-blocking 10/100M bridge with MAC and bridge. One segment of a bridge is fixed to 100 Mbps, while the other segment can be configured for 10 or 100 Mbps. • Bridge functions include: - Embedded 32 KB of memory for address table and packet buffer. - Local MAC address filtering. - XOR hashing scheme. - Short routing decision time. - Forwarding schemes: store-and-forward. - Address table up to 1K entries. • Programmable LED display for activity, link, speed, partition, utilization, and collision rate. • Advanced power management includes: - Each transceiver port can be turned off independently. - Standby mode, which reduces power when the port is not connected. • Low-power 2.5V 0.25 µm CMOS implementation with 128-pin QFP package. • Input tolerance to 3.3V. MUX P H Y R_100 R_10 Bridge 10M 100M . . . . . . P H Y P H Y P H Y MII MII RBP 256Kbits RAM TX0 TX1 TX2 TX7 Up Link P H Y TX3 P H Y TX4 P H Y TX5 P H Y TX6 10M RBP 100M RBP 100M RBP 10M RBP |
类似零件编号 - AC208-DS01-R |
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类似说明 - AC208-DS01-R |
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