Hardware layout and configuration
UM1932
16/31
UM1932 Rev 4
4.8 microSD™
card
A microSD™ card with a capacity of 4 GBytes or more can be inserted in the receptacle
CN9. 4 bits of the SDIO interface of the STM32F469NIH6 are used to communicate with the
microSD™ card. The card detection is read by the GPIO PG2: when a microSD™ card is
inserted, the logic level is 0, otherwise it is 1.
4.9 SDRAM
A 128-Mbit SDRAM is accessible with the FMC interface of the microcontroller
STM32F469NIH6. The data bus is 32-bit wide.
The SDRAM is composed of four banks of 32 Mbits selected by the address bits A14 and
A15.
Each of the four banks is organized as 4096 rows by 256 columns by 32 bits. Raw and
column addresses are pre-selected using the CAS and RAS signals of the FMC bus.
The SDRAM is selected by SDNE0 and can be addressed from 0xC000 0000 to
0xC0FF FFFF.
4.10 Quad-SPI
NOR
flash
memory
A 128-Mbit Quad-SPI NOR flash memory is connected to Quad-SPI interface of the
STM32F469NIH6 microcontroller.
4.11
Virtual COM port
The serial interface USART3 is directly available as a virtual COM port of the PC connected
to the ST-LINK/V2-1 USB connector CN1. The virtual COM port settings are configured as:
115200 b/s, 8 bits data, no parity, 1 stop bit, no flow control.
4.12 ARDUINO
®
connectors
CN5, CN6, CN7 and CN8 are female connectors compatible with the ARDUINO
®
standard.
Most shields designed for ARDUINO
®
Uno V3 can fit to the 32F469IDISCOVERY Discovery
board.
Caution:
The STM32 microcontroller I/Os are 3.3 V compatible while ARDUINO
®
Uno boards are 5 V
compatible.
Table 4. ARDUINO
®
compatible connectors
Connector
Pin
Pin name
MCU Pin
Function
LEFT connectors
CN6 Power
1
-
-
Not connected
2
IOREF
-
3.3V Ref
3
NRST
NRST
Reset
4
+3V3
-
+3.3V input/output
(1)
