Power Supply; Table 4. Logical Levels On Cfg0, Cfg1; Table 5. Ethernet Phy Configuration Defined By Cfg0, Cfg1; Table 6. U2 Dc/Dc Converter Jumpers - ST STM32F107Series User Manual

UM0896
Table 4.
Jumper
CFG0
(3-pin resistor)
(2.2 kΩ)
CFG1
(3-pin resistor)
(2.2 kΩ)
This strapping option pair determines the operating mode of the MAC data interface. Default
operation (no pull-ups) will enable normal MII mode of operation. Strapping CFG0 high will
cause the device to be in RMII mode of operation, determined by the status of the CFG1
strap. Since the pins include internal pull-downs, the default values are 0.
Table 5.
Note: Important: To choose between MII and RMII the pin RXDV of the PHY must be pulled high
for RMII and pulled low for MII during reset or power-up of the PHY.
5.2

Power supply

The STEVAL-PCC012V1 demonstration board is designed to be powered by a 24 V DC
power supply from CN2, P2. The board is protected against overvoltage by D4 Transil™
diode (SM6T33A) and against possible reverse polarity voltage from a wrong power plug-in
by D1 Schottky diode (STPS3L40U). The input voltage is connected to the DC/DC converter
U2 (L7986A).
Table 6.
Jumper
R4
www.BDTIC.com/ST
Logical levels on CFG0, CFG1
CFG0 = 0, default
The resistor must be placed as shown:
CFG0 = 1
The resistor must be placed as shown:
CFG1 = 0, default
The resistor must be placed as shown:
CFG1 = 1
The resistor must be placed as shown:
Ethernet PHY configuration defined by CFG0, CFG1
Function
MII
RMII
U2 DC/DC converter jumpers
To run DC/DC U2 on higher frequency R4 must be
assembled with 102 kΩ resistor. Other components
of the DC/DC must be changed accordingly.
(Default - not assembled)
Doc ID 17009 Rev 2
Description
CFG0
0
1
Description
Configuration
Configuration
CFG1
X
0
Configuration
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