Difference between revisions of "Core Coupled Memory (CCMRAM)"
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| − | + | [[Category:STM32]][[Category:STM32 Hardware]][[Category:STM32 Documentation]][[Category:STM32 Development]]{{metadesc|STM32 Core Coupled Memory - CCMRAM}} | |
| + | Some [[STM32]] [[MCU]]s include a feature called [[CCMRAM]] ([[Core Coupled Memory]]), which is separate from the regular SRAM region. | ||
| + | |||
| + | == Video == | ||
| + | |||
| + | We have created a tutorial video describing use of [[CCMRAM]]. The video can be viewed here: [https://www.youtube.com/watch?v=Eh7Szh-K-u8 https://www.youtube.com/watch?v=pvekb2h8_og]. | ||
| + | |||
| + | {{#ev:youtube|pvekb2h8_og}} | ||
| + | |||
| + | == Official documentation == | ||
| + | |||
| + | 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: | ||
| + | |||
| + | <div class="res-img"> | ||
| + | [[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: | ||
| + | |||
| + | <div class="res-img"> | ||
| + | [[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]] | ||
Latest revision as of 06:48, 28 November 2024
Some STM32 MCUs include a feature called CCMRAM (Core Coupled Memory), which is separate from the regular SRAM region.
Video
We have created a tutorial video describing use of CCMRAM. The video can be viewed here: https://www.youtube.com/watch?v=pvekb2h8_og.
Official documentation
According to the datasheet, the memory in STM32F405 is:
In the block diagram it is shown like this:
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:
As a result, the CCMRAM can not be used with DMA.