[20] RAM: RAM content cannot be trusted upon waking up from System ON IDLE or System OFF mode

This anomaly applies to IC Rev. Engineering A, build codes SICA-BAA.

Symptoms

RAM is not correctly retained.

The system is in System ON IDLE or System OFF mode, and the RAM is configured to be entirely or partially retained.

RAM is not correctly retained, and the content cannot be trusted.

At boot, apply register settings as below. For secure mode:

 
*((volatile uint32_t *)0x5003AEE4) = 0xE;

For non-secure mode:

 
*((volatile uint32_t *)0x4003AEE4) = 0xE;

Note: This item will be fixed on the production version of nRF9160-SICA.