The Wireless Gecko device has 1024K of Flash and 256K of RAM, plenty of memory to support the Wireless Protocol Stack of choice and application layer. With the Linked DMA Controller (LDMA), Silicon Labs has redesigned the DMA engine from the ground up to dramatically increase efficiency and take autonomous operation to the next level.  If you follow the color coding, you’ll notice you use this to perform memory operations without waking the MCU completely. The DC-DC converter regulates external supply/battery down to lower voltage for internal SoC circuitry.  This switching regulator provides greatly enhanced energy efficiency compared to a more common LDO regulator. The wireless gecko has enhanced its security block to include not only AES, but also add the latest security ciphers to ensure security in modern IoT designs.  This enables better protection for passive or active attackers trying to eavesdrop over-the air communication.