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CS8920A Datasheet(PDF) 5 Page - Cirrus Logic |
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CS8920A Datasheet(HTML) 5 Page - Cirrus Logic |
5 / 144 page The AUI port provides a direct interface to 10BASE-2, 10BASE-5 and 10BASE-FL net- works, and is capable of driving a full 50-meter AUI cable. 1.2 System Applications The CS8920A is designed to work well in either motherboard or adapter applications. Motherboard LANs The CS8920A requires the minimum number of external components needed for an Ethernet node, allowing a complete Ethernet circuit that occupies as little as 2.0 square inches of PCB area (Figure 1.1). In addition, the CS8920A’s power-saving features make it a perfect fit for power-sensitive portable and desktop PCs. Moth- erboard design options include: • The EEPROM, used to store node-specific information, such as the Ethernet Individual Address, can be eliminated by storing infor- mation in the system CMOS. • The 20 MHz crystal oscillator may be re- placed by a 20 MHz clock signal. Note: while operation of the CS8920A is possi- ble without the use of an attached EEPROM, special design considerations are required. Fur- thermore, some of the CS8920A functions, such as Plug and Play capabilities and wakeup frame recognition are not possible without an attached EEPROM. Please contact Crystal’s CS8920A technical support for more information on the use of the CS8920A without an attached EEPROM. Plug-and-Play Ethernet Adapter Cards The CS8920A’s highly efficient StreamTrans- fer TM and Auto-Switch DMA options, make it an excellent choice for high-performance, low- cost, ISA adapte r cards (Fig. 1.2). The CS8920A’s wide range of configuration options, listed below, allow engineers to design Ethernet solutions that meets their particular system re- quirements. • A Boot PROM can be added to support disk- less applications. • The 10BASE-T transmitter and receiver im- pedance can be adjusted to support 100, 120, or 150 Ω twisted pair cables. • On-chip LED ports can be used for either optional LEDs, or as programmable outputs. 1.3 Key Features and Benefits Very Low Cost The CS8920A is designed to provide the lowest- cost Ethernet solutions available for ISA desktop motherboards, portable motherboards, and adapter cards. Cost-saving features include: • Integrated RAM eliminates the need for ex- pensive external memory chips. RJ-45 10BASE-T CS8920A I S A EEPROM 20 MHz XTAL (2.0 sq. in.) Figure 1.1. Complete Ethernet Motherboard Solution CS8920A DS238PP1 5 |
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