3. TECHNICAL BRIEF
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3. TECHNICAL BRIEF
3.1.6 Ethernet Interface (Transformer & RJ-45, U104 & CN101)
This Ethernet Interface is connected to the outside device through the RJ-45 connecter.
And the Ethernet signals from the connecter go into the transformer with the function which is line impedance
matching of Ethernet port.
This transformed impedance required the differential 100ohm for the Main chipset (BCM5358U).
The Ethernet signals go from the transformer to BCM5358U which is the Main chipset.
Ethernet Interface
PORT1_TDP : Plus signal of Ethernet transmit pair.
PORT1_TDN : Minus signal of Ethernet transmit pair.
PORT1_RDP : Plus signal of Ethernet receive pair.
PORT1_RDN : Minus signal of Ethernet receive pair.
Figure 3.6 Transformer & RJ-45
220
FB100
8.2p
C153
8.2p
C154
8.2p
C151
8.2p
C152
0.1u
C132
0.1u
C131
0.1u
C128
75
R134
0
63
1
R
VDD_2.5
10u
C130
10u
C129
0
R138
0
R137
0
R135
C127
1n
0
R133
U104
ELCP0009412
TLA-6T118LF
14
16
12
10
1
8
9
13
11
6
7
5
4
3
2
15
CM2
V_CTR1
TD-
NC1
NC2
V_CTR2
RD+
RX+
NC4
RX-
RD-
TD+
CM1
NC3
TX+
TX-
PORT1_RDN
PORT1_RDP
PORT1_TDN
PORT1_TDP
P1_RDP
P1_RDN
P1_TDP
P1_TDN
C137
1n
C138
1n
CN101
ENZY0030801
85507-5001
10
8
4
7
3
6
2
5
1
9
G1
G4
G3
G2
0
05
1
R
0
15
1
R
75
R148
75
R146
P1_RDP
P1_RDN
P1_TDP
P1_TDN