If an Ethernet PHY is connected to
the GMAC0/1 pins of the MPU, unless the PHY supports adjustable drive strength, it
is recommended that series resistors (33 Ω for ex) are placed on the RX lines of the
interface, close to the PHY.
If CMOS-compatible output oscillators
are used as clock sources for the MPU, Ethernet PHYs or other devices, their active
low standby pin (if present) can be driven low by an N-channel MOSFET controlled by
the LPM pin of the MPU. This feature helps reduce power consumption during certain
low-power modes when those clock sources are not used.
If the application requires the
current measurement of certain power rails, those rails can be split by shunt
resistors.
The NRST_OUT pin of the MPU can be used as a reset source for other devices used in
the design (QSPI memories, Ethernet PHYs, etc.)
Each SDMMC interface has its own
dedicated reset pin (SDMMCx_RSTN). It can be used to reset SDIO devices or to
perform power cycles on SD cards.
It is recommended to use ports
PD18 (FLEXCOM6_IO0 - TX) and PD19
(FLEXCOM6_IO1 - RX) as a serial debug console, since those ports are
configured by default for this function at power-up.
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.
