Publication# 14606
Rev. B
Amendment/0
Issue Date: January 1992
34
Advanced
Micro
Devices
Am7996EVAL-HW
Ethernet/Cheapernet Transceiver Evaluation Kit
DISTINCTIVE CHARACTERISTICS
s
Connects the standard AUI port interface to
10BASE2 (Cheapernet) connector.
s
Jumper selectable Signal Quality Error (SQE)
test allows evaluation in both node and
repeater applications.
s
Self contained board facilitates rapid
evaluation of the AUI -to-coax system block,
and demonstrates optimal analog design
criteria.
GENERAL DESCRIPTION
The Am7996EVAL-HW board is a self contained mod-
ule that implements all the functions of a Medium At-
tachment Unit (MAU) for IEEE 802.3 10BASE2
(Cheapernet). This 3"x3" board can be used to connect
any AUI port interface to the `thin' coaxial cable used in
Cheapernet networks. This system permits the network
designer to monitor signals on the card to increase his
understanding of IEEE 802.3 standards and conven-
tions. A jumper selectable SQE test enable/disable lets
the board function in both user node or network repeater
applications. In addition, optimal PC board layout is em-
ployed. The Am7996EVAL-HW kit comes complete with
schematics, application notes, and coaxial cable con-
nection hardware.
BLOCK DIAGRAM
Am7996
AUI Port
Cheapernet
DC DC
Power
Supply
JUMPER SETTINGS
The jumper settings specify the type of collision detect
that is used.
Transmit collision detect:
connect 1 & 3
Receive collision detect:
connect 1 & 2
3 & 4
AMD
35
Am7996EVAL-HW
CIRCUIT DIAGRAM
24.9 k
P2-14
P2-11
P2-4
P2-1
P2-6
P2-13
P2-10
P2-12
P2-8
Collision
Receive
Transmit
1
2
4
5
7
8
P2-2
P2-9
P2-5
P2-3
15
13
12
PE64102
or
PE64107
10
9
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
40.2 1%
R10
R9
VCC1
CI+
CI
DI+
DI
VCREF
SQ
E
Test
DO+
DO
V
EE
VCC2
COLL OSC
VCOL
NC
RXT
NC
Tap
Shield
VTX
TXT
VTX+
A
m
7
9
9
6
R8
174 1%
W2
SQE
C7
C6
+4.7
F
25 V
0.1
F
C9
0.1
F
+IN
OUT
+12 V
9 V
IN
+OUT
n/c
C10
1500 pF
3 KV
C8
+4.7
F
*DC DC Converter
40.2 1%
9 V
R4 5%
1.1 k
33 pF
C5
RMC
TMC 1
2
3
4
C
L
0.1
F
C1
R7 9.09 1%
C4
150 pF
CR2
IN4001
CR1
IN4150
BNC
Connector
C3
R5 75 K
RMC
R1
150 k
499
R2
0.1
F
P1
1%
R6 9.09 1%
Notes:
C
L
= Effective Parasitic Capacitance
C3
= 1/3 C
L
(PC Trace was Used for C3)
RMC = Receive Mode Collision Detection (R1, R2, and C2 are needed for RMC Function)
Jumper 1 to 2 and 3 to 4
TMC
= Transmit Mode Collision Detection
Jumper 1 to 3, open 2 and 4
R8 = 0 (Short)
Reliability INC.
2E12R9
1
2
4
5
Pulse Engineering
PE64540
1, 2
23, 24
11, 12
9, 10
+IN
IN
+OUT
OUT
Input = +12 V
Output = 9 V
DC/DC Converters
DC DC CONVERTER PINOUT
16
C2
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