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ML6691 Datasheet(PDF) 1 Page - Micro Linear Corporation

Part No. ML6691
Description  100BASE-T MII-to-PMD Transceiver
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML6691 Datasheet(HTML) 1 Page - Micro Linear Corporation

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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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