Can FEC memory be used as general-purpose RAM?

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Can FEC memory be used as general-purpose RAM?

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EAlepins
Contributor V

In the MPC5777C, I will not be using the FEC Ethernet controller. However, it would be nice if I could increase the total internal RAM such that the cores/applications could put variables in the FEC internal RAMs. Is that possible?

Also, what is the size and number of RAMs embedded in the FEC?

Thanks.

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davidtosenovjan
NXP TechSupport
NXP TechSupport

Hi,

I have tried it and it seems FEC MIB RAM can be used as "normal" RAM when FEC is disabled. Is is small area 0xFFF4_C200h–0xFFF4_C3FFh and it can only be accessed by 32-bit. Also access time is expected to be slower (access over PBRIDGE).

FEC FIFO RAM does not seems to be possible to access directly.

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davidtosenovjan
NXP TechSupport
NXP TechSupport

Hi,

I have tried it and it seems FEC MIB RAM can be used as "normal" RAM when FEC is disabled. Is is small area 0xFFF4_C200h–0xFFF4_C3FFh and it can only be accessed by 32-bit. Also access time is expected to be slower (access over PBRIDGE).

FEC FIFO RAM does not seems to be possible to access directly.

View solution in original post

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