R-IN32M4-CL3 User's Manual: Board design edition
6. Gigabit Ethernet PHY Pins
R18UZ0074EJ0100
Page 13 of 61
Dec 24, 2019
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
10 µF
10 µF
For the number
of pins
R-IN32M4-CL3 power
VDD11A
VDD11A
VDD11
VDD25A
VDD25A
VDD25A
3.3 V
power plane
VDD33
PLL_VDD
VDD11
VDD33
GbE-PHY power
Place these
capacitors as close
to the respective
power source pins
as is possible.
1.15 V
power plane
2.5 V
power plane
◎
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.
47 µF
10 µF
10 µF
See Section 4, PLL
Power Supply Pins.
R-IN power
0.1 µF
Ferrite
bead
Ferrite
bead
VDDREG_33
AVDDREG_33
For the peripheral circuit configuration,
refer to Section 7 "2.5-V built-in Regulator
Peripheral Circuit Configuration".
2.5-V built-in regulator power
Figure 6.1 Configuration of Gigabit Ethernet PHY Power Supply Peripheral Circuit
