Ethernet; Sdram Memory; Quad-Spi Nor Flash Memory; Figure 12. Inside Rj45 Jack - ST STM32F746G-DISCO User Manual

UM1907
6.10

Ethernet

The STM32F746G-DISCO discovery board supports 10/100-Mbit Ethernet communication
by a PHY LAN8742A-CZ-TR (U9) from MICROCHIP and RJ45 jack (CN9). Ethernet PHY is
connected to STM32F746NGH6 via RMII interface.
25 MHz clock for the PHY is generated by the oscillator X2, the 50 MHz clock for the
STM32F746NGH6 is generated by the PHY RMII_REF_CLK.
6.11

SDRAM memory

128-Mbit SDRAM (MT48LC4M32B2B5-6A from MICRON) is connected to the FMC
interface of the STM32F746NGH6. Only the lowest 16-bit data are used (64-Mbit
accessible). DQ16 to DQ31 are unused and connected to a 10K ohm pull-down resistor.
6.12

Quad-SPI Nor Flash memory

128-Mbit Quad-SPI Nor Flash memory (N25Q128A13EF840E from MICRON) is connected
to the Quad-SPI interface of the STM32F746NGH6.

Figure 12. Inside RJ45 jack

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Hardware layout and configuration
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