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nrf52840 RAM size

joel-sc

Hello,

I'm struggling to understand the available RAM size in that chip.

After reading the product specification v1.7, the RAM specification is described as follow:

In the section 4.2 Memory the RAM size is specified as 256 kB RAM:

The nRF52840 contains 1024 kB of flash memory and 256 kB of RAM that can be used for code and data
storage.

But in the next section 4.2.1 RAM - Random access memory, the size is specified as following:


The RAM interface is divided into nine RAM AHB slaves.
RAM AHB slaves 0 to 7 are connected to two 4 kB RAM sections each, while RAM AHB slave 8 is connected
to six 32 kB sections, as shown in Memory layout on page 21

Where the total size is 8 * 4K + 6 * 32k = 229376 which is not equal to 256K (262144).

What is the total RAM available for the application and where can find this information ?

Thanks

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  • 0
    The RAM interface is divided into nine RAM AHB slaves.
    RAM AHB slaves 0 to 7 are connected to two 4 kB RAM sections each, while RAM AHB slave 8 is connected
    to six 32 kB sections, as shown in Memory layout on page 21
    Where the total size is 8 * 4K + 6 * 32k = 229376 which is not equal to 256K (262144).

    There are 2 of those 4kB section for the 0 to 7 RAM AHB slaves, so 8*2*4*1024+6*32*1024 = 262144

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  • 0
    The RAM interface is divided into nine RAM AHB slaves.
    RAM AHB slaves 0 to 7 are connected to two 4 kB RAM sections each, while RAM AHB slave 8 is connected
    to six 32 kB sections, as shown in Memory layout on page 21
    Where the total size is 8 * 4K + 6 * 32k = 229376 which is not equal to 256K (262144).

    There are 2 of those 4kB section for the 0 to 7 RAM AHB slaves, so 8*2*4*1024+6*32*1024 = 262144

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