What type of ARM is used in 10-Gb Ethernet chip?

Hi,

I heard that some 10-Gb Ethenet chip embedded an ARM core. I am curious about what type of ARM (A, M or R) is embedded in such a high speed Ethernet ASIC. I feel that it may be a R series ARM. Is it right? Due to such a high speed data rate, what chip would be, is it A11, or A15?

Thanks,

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