Usb Otg Fs; Ethernet - ST STM3220G-EVAL User Manual

UM1057
2.15

USB OTG FS

STM3220G-EVAL evaluation board enables USB OTG full speed communication via a USB
Micro-AB connector (CN8) and USB power switch (U1) connected to VBUS. The evaluation
board can be powered by this USB connection at 5V DC with a 500 mA current limitation.
The LED LD6 indicates that the power switch (U1) is ON and STM3220G-EVAL functions as
a USB host or that the VBUS is powered by another USB host while STM3220G-EVAL
functions as a USB device. The LED LD5 indicates an over-current.
2.16

Ethernet

STM3220G-EVAL evaluation board enables 10/100M ethernet communication by a PHY
DP83848CVV (U5) and integrated RJ45 connector (CN7). Both MII and RMII interface
modes can be selected by setting jumpers JP5, JP6 and JP8 as listed below:
Table 11.
Jumper
Note: 1 A test point (TP2) is available on the board for the PTP_PPS feature test.
2 The Ethernet PHYU5 can be powered down by regulating PB14.
Ethernet related jumpers and solder bridges
JP8 is used to select MII or RMII interface mode.
To enable MII, JP8 is not fitted.
JP8
To enable RMII interface mode, JP8 is fitted.
Default setting: Not fitted
To enable MII interface mode, set JP6 as shown (Default
setting):
JP6
To enable RMII interface mode, set JP6 as shown:
To provide 25 MHz clock for MII or 50 MHz clock for RMII by
MCO at PA8, set JP5 as shown (Default setting):
To provide 25 MHz clock by external crystal X1 (for MII interface
JP5
mode only) set JP5 as shown:
When clock is provided by external oscillator U3, JP5 must not be fitted
(Default setting).
SB1 is used to select clock source only for RMII mode.
To connect the clock from MCO to RMII_REF_CLK, close SB1.
SB1
The resistor R212 has to be removed in this case.
Default setting: Open
Doc ID 018499 Rev 2
Hardware layout and configuration
Description
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