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Electronic Components Datasheet Search |
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KS8993 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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KS8993 Datasheet(HTML) 1 Page - Micrel Semiconductor |
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May 2005 1 KS8993 KS8993 Micrel KS8993 3-Port 10/100 Integrated Switch with PHY and Frame Buffer Rev. 2.05 General Description The KS8993 contains three 10/100 physical layer transceiv- ers, three MAC (Media Access Control) units with an inte- grated layer 2 switch. The device runs in two modes. The first mode is a three port integrated switch and the second is as a three port switch with the third port decoupled from the physical port. In this mode access to the third MAC is provided using a reverse or forward MII (Media Independent Interface) such that an external MAC can be directly connected to the KS8993. This interface also supports the 7-wire (serial net- work interface) as used by some routing devices. Useful configurations include a stand alone three port switch as well as a two port switch with a routing element connected to the extra MII port. The additional port is also useful for public network interfacing. Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com Functional Diagram Look-Up Engine (1K Entries) SRAM Buffers (16Kx32) MII / SNI (exclusive) External Interface FIFO and Flow Control Queue Management Buffer Management LED and Programming Interface MRXD[3:0] MRXDV MCOL MTXD[3:0] MTXEN MTXER Physical Transceiver 1 MAC 1 Physical Transceiver 2 MAC 2 Physical Transceiver 3 MAC 3 LED[1][3:0] LED[2][3:0] LED[3][3:0] MRXD[0] MRXDV MCOL MTXD[0] MTXEN S N I M I I MTXCLK MRXCLK MTXCLK MCOLIN MCRS MRXCLK The KS8993 has rich features such as VLAN and priority queuing and is designed to reside in an unmanaged design not requiring processor intervention. This is achieved through I/O strapping at system reset time. On the media side, the KS8993 supports 10BaseT, 100BaseTX and 100BaseFX as specified by the IEEE 802.3 committee. Physical signal transmission and reception are enhanced through use of analog circuitry that makes the design more efficient and allows for lower power consumption and smaller chip die size. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. |
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