Gigabit Ethernet Phy Pins; Power Supply Peripheral Circuit; Circuit Configuration - Renesas R-IN32M4-CL2 User Manual

R-IN32M4-CL2 User's Manual: Board design edition
6.

Gigabit Ethernet PHY Pins

Since the Gigabit Ethernet PHY interface handles high-speed transfer, designing the board pattern for it and other
components requires full consideration on numerous points.
Design it in accord with the advice in this section.
6.1

Power Supply Peripheral Circuit

6.1.1

Circuit Configuration

See Section 15, A/D
Converter Pins.
3.3 V
power plane
47 µF 10 µF
47 µF
Place these
capacitors as close
to the respective
power source pins as
is possible.
Figure 6.1 Configuration of Gigabit Ethernet PHY Power Supply Peripheral Circuit
R18UZ0046EJ0200
Dec. 28, 2018
R-IN32M4-CL2 power
R-IN power
AVDD
VDD33
GbE-PHY power
For the number
of pins
VDD33_GPHY
VDD33_GPHY
VDD33_GPHY
0.1 µF
VDD33_GPHY
VDD33_GPHY
VDD33_GPHY
VDD33_GPHY
VDD33_GPHY
10 µF
◎ Decoupling capacitors (bypass capacitors)
Placing one within 0.5 inches of each power supply
pin is preferable.
Give priority to the placement of bypass capacitors
for GbE-PHY power pins. When placing bypass
capacitors for all of the R-IN power supply pins is
difficult, arrange one for every two or three pins.
6. Gigabit Ethernet PHY Pins
See Section 4, PLL
PLL_VDD
Power Supply Pins.
VDD10
10 µF
VDD25A
Ferrite
VDD25A
bead
10 µF
VDD25A
VDD1
VDD1
10 µF
VDD1
Ferrite
VDD1
bead
VDD1A
VDD1A
10 µF
Place these
capacitors as close
to the respective
power source pins
as is possible.
1.0 V
power plane
2.5 V
power plane
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