Functional Descriptions; Twisted Pair Media Interface; Voltage Mode Line Driver; Figure 2.1 Media Interface - Renesas R-IN32M4-CL2 User Manual

R-IN32M4-CL2 User's Manual Gigabit Ethernet PHY Edition
2.

Functional Descriptions

This section describes the functional aspects of the GbE-PHY, including available operational features, and testing
functionality.
2.1

Twisted Pair Media Interface

The twisted pair interface is compliant with IEEE 802.3-2008.
2.1.1

Voltage Mode Line Driver

The GbE-PHY uses a voltage mode line driver that allows it to fully integrate the series termination resistors, which are
required to connect the PHY's media interface to an external 1:1 transformer. Also, the interface does not require the user to
place an external voltage on the center tap of the magnetic. The following illustration shows the connections.
PHY Port_n
(n=[1:0])

Figure 2.1 Media Interface

R18UZ0043EJ0100
Mar 4, 2016
Pn_D0P
0.1µF
Pn_D0N
Pn_D1P
0.1µF
Pn_D1N
Pn_D2P
0.1µF
Pn_D2N
Pn_D3P
0.1µF
Pn_D3N
Transformer
2. Functional Descriptions
RJ-45
1
A+
2
A–
3
B+
6
B–
4
C+
5
C–
7
D+
8
D–
75 Ω
75 Ω
1000 pF,
2 kV
75 Ω
75 Ω
Page 2 of 39