April 1997
ML4644*
4 Port AUI Multiplexer
GENERAL DESCRIPTION
The ML4644 AUI Multiplexer contains all the necessary
drivers/receivers and control logic to implement a 4 port
MAU when used in conjuction with a transceiver chip
which has a standard 802.3 AUI interface. Several
ML4644s can be cascaded together to implement an 8 or
12 port MAU or standalone device.
Logic within the ML4644 detects collisions resulting from
multiple DTEs transmitting simultaneously. In addition,
collision signals received from a transceiver attached at
the MAU port are propagated to all of the DTE ports.
Jabbering DTEs are prevented from loading down the
network by an internal jabber timer which disables
babbling ports.
FEATURES
s
IEEE 802.3 compliant AUI interfaces assure
compatibility with any AUI ready devices.
On-chip Jabber logic, Collision Detection,
and SQE test with enable/disable option.
Selectable SQE Test
Selectable loopback
Ten network status LED outputs.
s
s
s
s
* This Part Is End Of Life As Of August 1, 2000
BLOCK DIAGRAM
67
55
56
21
20
54
53
64
10
7
24
23
2
1
31
12
11
34
33
5
4
32
46
47
37
36
59
58
44
66
61
17
25
TxIN1N
TxIN1P
RxOUT1N
RxOUT1P
CDOUT1N
CDOUT1P
SQEN1
TxIN2N
TxIN2P
RxOUT2N
RxOUT2P
CDOUT2N
CDOUT2P
SQEN2
TxIN3N
TxIN3P
RxOUT3N
RxOUT3P
CDOUT3N
CDOUT3P
SQEN3
TxIN4N
TxIN4P
RxOUT4N
RxOUT4P
CDOUT4N
CDOUT4P
SQEN4
22
3
51
X2 X1
MAU
AUI
INTERFACE
X3
R
RESET
BIASING
VCC
26
VCC
OSCILLATOR
MAU
AUI
INTERFACE
TxOUTP
TxOUTN
MUX
DTE
AUI
INTERFACE
RxINP
RxINN
CDINP
CDINN
15
14
29
30
63
60
MAU
AUI
INTERFACE
MAU
AUI
INTERFACE
LED DRIVERS
COLL
JAB1
JAB2
JAB3
JAB4
GND
41
REC
Tx1
Tx2
Tx3
49
50
Tx4
48
45
19
39
52
1
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
