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The Apollo4 Plus Display Shield and the Apollo4 Display Shield are not

compatible with each other due to pin differences. The Apollo4 Plus Display

Shield must be used with the Apollo4 Plus EVB (AMAP4PEVB), and the Apollo4

Display Shield must be used with the Apollo4 EVB (AMAP4EVB).

Each display kit has its own board support package (BSP) provided in the

AmbiqSuite SDK. Support for the Apollo4 Plus Display Shield started in release

4.3.0.

Aside from pin differences, other differences between the two display shields

are the following Apollo4 Plus Display Shield features:

▪ The MSPI1 flash device was changed from Adesto ATXP032 used on the

Apollo4 Display Shield to ISSI IS25WX064.

▪ A mux was added to swap between the upper data pins of the MSPI0 hex

interface to the PSRAM (MSPI1 not used) and MSPI1 octal interface to the

IS25WX064 DDR Flash, as described at the beginning of this section.

5.1

Secure Boot on the Apollo4 SoC

Apollo4 SoC parts from the Ambiq Micro 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 JLINK (OTP Setting).

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

C. Timeout is 3 seconds.

For your 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-A4DK-1p1

Apollo4 Display Kit Quick Start Guide

NOTE

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