Is there a cache in the ARM Cortex-M4?

kevintaylor1544 — Tue, 19 May 2020 08:19:06 GMT

I want to know if there is a cache inside the ARM Cortex-M4.

I did not find any clue in the technical reference manual, but is that official or hidden? I know that some microcontrollers have a cache, but then it's between the bus and the RAM, not inside the core.

Do you know of any document that clarifies this?

Re: Is there a cache in the ARM Cortex-M4?

Yuri — Tue, 19 May 2020 09:17:57 GMT

Hello,

If we consider i.MX7, which consist of Cortex A7 and Cortex-M4; in section 4.2.1 (Overview)

of i.MX 7Dual r Reference Manual, Rev. 1, 01/2018:

"The Cortex-M4 implementation includes two tightly-coupled local memories and two cache

memories connected to these bus interfaces although the device implementation connects

to the 64-bit system bus interconnect and supports a 32-byte cache line size.
• L1 2-way set-associative 16 KB Instruction/Data cache with 32B line size length ..."

Regards,

Yuri.

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Is there a cache in the ARM Cortex-M4?

Re: Is there a cache in the ARM Cortex-M4?