ambiq micro Apollo4 Blue EVB Hızlı Başlangıç Kılavuzu - Sayfa 10

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Ayrıca ambiq micro Apollo4 Blue EVB için: Hızlı Başlangıç Kılavuzu (18 sayfalar)

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▪ Debugger-in port (J13) (SWD or ETM)

▪ Three user-controlled LEDs

▪ Two push buttons for application use, plus a reset push button

▪ Power slide switch with LED power indicator

▪ Five headers (J7, J9-J12) for pin/power access to a shield board

▪ Test points for power measurements

▪ High-speed connector (J8 - QSH-030-01-L-D-A) for interfacing to displays and/or high-speed memory

▪ RF switch/connector (Murata MM8430-2610RA1) for BLE PHY testing

▪ Multiple solder-bridge options for power supply flexibility and peripheral access options

▪ 3.5 mm audio jack (SJ-435107) for evaluating low-power analog audio interface

▪ RoHS compliant

Caution: The EVB has components loaded on the back of the board. Care should be taken to not damage

these components.

5.1

Secure Boot on the Apollo4 SoC

Apollo4 SoC parts from the Ambiq factory are preprogrammed with a Secure Bootloader and an

uninitialized Customer Info Space, referred to as INFO0. Initial provisioning of the part would include

programming a valid INFO0 and programming the main firmware image in the flash. The Apollo4 EVB is

shipped with the INFO0 configuration pre-programmed with optimal settings for the EVB layout:

Default boot to non-secure mode

Enable Boot Override to Push Button on GPIO18 (OTP setting) - BTN0/SW1.

Enable wired updates over UART0

A. UART0 is mapped to J-Link (OTP Setting).

B. Baud rate is 115200 bps, no-parity, 8-bit data length, no flow control.

C. Timeout is 3 seconds.

For reference, the following settings are programmed into INFO0 on the Apollo4 SoC resident on the EVB:

▪ SIMO Buck is NOT enabled.

▪ Secure Bootloader (SBL) interface is configured to UART using GPIO47 and GPIO60, which allows

secure boot to be performed over the J-Link COM interface of the EVB.

▪ SBL override pin is configured to GPIO18 which is BTN0/SW1 on the EVB.

▪ All Flash and Debugger protection features are disabled.

For information on changing the INFO0 settings as well as using the Secure Bootloader, please refer to the

README.txt file, which can be found in the tools\apollo4b_scripts folder of the latest SDK release

supporting the Apollo4 family. This folder contains a number of python scripts to demonstrate generation of

INFO0 settings, customer main images, and the creation of images for the Wired Update protocol over

UART.

QS-A4-4p1

Apollo4 EVB Quick Start Guide

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