View source for Core Coupled Memory (CCMRAM)

Some [[STM32]] [[MCU]]s include a feature called [[CCMRAM]] ([[Core Coupled Memory]]), which is separate from the regular SRAM region.

According to the [https://www.st.com/resource/en/datasheet/dm00037051.pdf datasheet], the memory in [[STM32F405]] is:

<div class="res-img">
[[File:STM32F405 Memory.png|400px]]
</div>

In the block diagram it is shown like this:

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[[File:STM32F405 Memory Architecture.png|900px]]
</div>

It is worth noticing a few things.  As the name implies this RAM is connected directly to the [[MCU]] core but separate from the AHB bus matrix.  Looking at the bus matrix:

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[[File:STM32F405 Bus Matrix.png|900px]]
</div>

As a result, the [[CCMRAM]] can '''not''' be used with [[DMA]].

== Usage Examples ==

* [[STM32 FreeRTOS|Using CCMRAM for FreeRTOS Heap]]