ML6691CQ 查看數據表（PDF） - Micro Linear Corporation

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ML6691CQ

100BASE-T MII-to-PMD Transceiver

Micro Linear Corporation 

March 1997

ML6691*

100BASE-T MII-to-PMD Transceiver

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

optical PMD.

BLOCK DIAGRAM

VCC

TXC

OSC

FEATURES

s Conforms to the Fast Ethernet 100BASE-T

IEEE 802.3µ 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

* This Part Is End Of Life As Of August 1, 2000

GND

TXCLK

TXD3

...

TXD0

TXEN

TXER

COL

CRS

RXDV

RXER

NIBBLE

INPUT

REGISTER

4B/5B

ENCODER

STREAM

CIPHER

SCRAMBLER

SYMBOL

OUTPUT

REGISTER

TRANSMIT

STATE

MACHINE

COLLISION

DETECTION

RECEIVE

STATE

MACHINE

TSM4

...

TSM0

SD

DCFR

RXCLK

RXD3

...

RXD0

MDIO

MDC

NIBBLE

OUTPUT

REGISTER

5B/4B

DECODER

SYMBOL

ALIGNER

STREAM

CIPHER

DESCRAMBLER

SYMBOL

INPUT

REGISTER

ISOLATE

FULLDUP COLTST

LPBK

LINK FAILED

MANAGEMENT SECTION

CONTROL

STATUS

RSM4

...

RSM0

RXC

CS

LPBK

LOCAL AD4...AD0

RST

1

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