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.

FEATURES
■ Conforms to the Fast Ethernet 100BASE-T IEEE 802.3µ standard
■ Integrated 4B/5B encoder/decoder
■ Integrated Stream Cipher scrambler/descrambler
■ Compliant MII interface
■ Two-wire serial interface management port for configuration and control
■ On-chip 25 MHz crystal oscillator
■ Interfaces to either AMD’s PDT/PDR (AM79865/79866) or Motorola’s FCG (MC68836)
■ Used with ML6673 for 100BASE-TX solutions
■ 44-pin PLCC package