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ML6691 Datasheet(PDF) 1 Page - Micro Linear Corporation |
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ML6691 Datasheet(HTML) 1 Page - Micro Linear Corporation |
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1 / 10 page  1 March 1997 ML6691 * 100BASE-T MII-to-PMD Transceiver FEATURES s Conforms to the Fast Ethernet 100BASE-T IEEE 802.3 µ standard s Integrated 4B/5B encoder/decoder s Integrated Stream Cipher scrambler/descrambler s Compliant MII interface s Two-wire serial interface management port for configuration and control s On-chip 25 MHz crystal oscillator s Interfaces to either AMD’s PDT/PDR (AM79865/79866) or Motorola’s FCG (MC68836) s Used with ML6673 for 100BASE-TX solutions s 44-pin PLCC package GENERAL DESCRIPTION The ML6691 implements the upper portion of the physical layer for the Fast Ethernet 100BASE-T standard. Functions contained in the ML6691 include a 4B/5B encoder/ decoder, a Stream Cipher scrambler/descrambler, and collision detect. Additional functions of the ML6691 — accessible through the two-wire MII management interface — include full duplex operation, loopback, power down mode, and MII isolation. The ML6691 is designed to interface to a 100BASE-T Ethernet Media Access Controller (MAC) via the MII (Media Independent Interface) on one side, and a 100BASE-X PMD transceiver on the other side. A complete 100BASE-TX physical layer (PHY) solution is realized using the ML6691, the ML6673, and one of the available clock recovery/generation devices. A 100BASE- FX physical layer solution is implemented by disabling the scrambler function of the ML6691 and using an external * This Part Is End Of Life As Of August 1, 2000 optical PMD. BLOCK DIAGRAM OSC NIBBLE INPUT REGISTER 4B/5B ENCODER STREAM CIPHER SCRAMBLER SYMBOL OUTPUT REGISTER TRANSMIT STATE MACHINE COLLISION DETECTION RECEIVE STATE MACHINE NIBBLE OUTPUT REGISTER 5B/4B DECODER SYMBOL ALIGNER STREAM CIPHER DESCRAMBLER SYMBOL INPUT REGISTER MANAGEMENT SECTION CONTROL STATUS ISOLATE FULLDUP COLTST LPBK LINK FAILED LOCAL AD4...AD0 RST MDIO MDC RXCLK RXD3 RXD0 ... RXER RXDV CRS COL TXER TXEN TXCLK TXD3 TXD0 ... TXC VCC GND TSM4 TSM0 ... SD DCFR RXC RSM4 RSM0 ... LPBK CS |
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