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UM1855 Hardware layout and configuration
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Figure 6. CN20, CN21 top view
2.7.3 Limitations in using audio features
Due to the share of some terminals of STM32L476ZGT6 by multiple peripherals, the
following limitations apply in using the audio features:
• If the SAI1_SDA is used as part of SAI1 port, it cannot be used as FMC_NWAIT signal
for NOR Flash memory device. However, FMC_NWAIT is not necessary for operating
the NOR Flash memory device. More details on FMC_NWAIT are available in
Section 2.22: NOR Flash memory device.
• If the SAI1 port of STM32L476ZGT6 is used for streaming audio to the WM8994 codec
IC, STM32L476ZGT6 cannot control the motor.
• If the digital microphones are attached to STM32L476ZGT6, the LCD glass module
cannot be driven.
2.8 USB OTG FS port
The STM32L476G-EVAL board supports USB OTG full-speed (FS) communication.The
USB OTG connector CN1 is of Micro-AB type.
2.8.1 STM32L476G-EVAL used as USB device
When a “USB host” connection to the CN1 Micro-AB USB connector of STM32L476G-EVAL
is detected, the STM32L476G-EVAL board starts behaving as “USB device”. Depending on
the powering capability of the USB host, the board can take power from VBUS terminal of
CN1. In the board schematic diagrams, the corresponding power voltage line is called U5V.
Section 2.3 provides information on how to set associated jumpers for this powering option.
The JP19 jumper must be left open to prevent STM32L476G-EVAL from sourcing 5 V to
VBUS terminal, which would cause conflict with the 5 V sourced by the USB host. This may
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