CD00237391 Datasheet, PDF (160/177 Pages) STMicroelectronics – ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM

Application block diagrams
STM32F20xxx
A.4 USB OTG high speed (HS) interface solutions
Figure 89. OTG HS (high speed) device connection, host and dual-role
in high-speed mode with external PHY
STM32F20xxx
USB HS
OTG Ctrl
FS PHY
DP
not connected
DM
ULPI
ULPI_CLK
ULPI_D[7:0]
ULPI_DIR
ULPI_STP
ULPI_NXT
XT1
PLL
24 or 26 MHz XT⁽¹⁾
High speed
OTG PHY
MCO1 or MCO2
XI
DP
DM
ID⁽²⁾
V_BUS
V_SS
USB
connector
ai16036c
1. It is possible to use MCO1 or MCO2 to save a crystal. It is however not mandatory to clock the STM32F20x
with a 24 or 26 MHz crystal when using USB HS. The above figure only shows an example of a possible
connection.
2. The ID pin is required in dual role only.
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Doc ID 15818 Rev 9