AN4471 datasheet(7/39 Pages) STMICROELECTRONICS

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AN4471

Hardware layout and configuration

• VDDM: Negative supply voltage -3.3 V to 0 (J2 conn.)

• GND: Ground (J2 conn.)

• HVMCW: Continuous wave high voltage negative supply (J3 conn.)

• HVM0: TX high voltage negative supply (J3 conn.)

• GND: Ground (J3 conn.)

3.2

MCU

The STM32F103C8T6 updates the waveform and the FPGA bit stream on the SPI Flash

memory. It is already pre-programmed as a DFU (device firmware upgrade) device and can

upgrade internal and external Flash memory. The STM32F103 manages all the DFU

operations, such as the authentication of product identifier, vendor identifier, Firmware

version as well as the alternate setting number (Target ID). This is used to upgrade the SPI

Flash memory hosted on the STEVAL-IME009V1 and render the upgrade more secure.

Note:

See AN3156, UM0412 and UM1083 for further details about the upgrade through DFU.

3.3

SPI Flash memory

The STEVAL-IME009V1 hosts a Micron N25Q032 (U9), it is a 32-Mbit (4 Mb x 8) serial

Flash memory with advanced write protection mechanisms. It can be accessed by a high

speed SPI-compatible bus and can even work in XIP (eXecution in Place) mode.

The N25Q032 also supports the high-performance quad I/O instructions used by the FPGA

to quadruple the transfer bandwidth for read and program operations.

If extra data memory is needed, the user can connect external Flash memory to the J10

connector. When the external Flash is plugged, LED D29 is on Table 3.

The Flash memory is configured by setting J38 as described in Table 4.

Table 3. SPI Flash memory LED

Color

Name

Description

D29

Green

EXT SPI-FLASH

The external SPI-Flash module is connected

D30

Red

On-board SPI-FLASH

The on-board SPI-Flash is used

Table 4. SPI Flash memory jumper

Status

Description

J38

Closed

Fitted (default setting): enable the power supply to the on-board

SPI Flash memory (U9).

Open

Unfitted: disable the power supply to the on-board SPI Flash

memory.

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