Are 4 R52 Lock step pairs the part of CPU or is there any separate CPU?

Hi,
Since NVIDIA drive orin has 4 R52 Lock-Step pairs Integrated Safety Island ASIL-D. So my question is that, is there any separate CPU or is it a part of CPU? Some clarification would be helpful.

Dear @akshay.tupkar,
FSI(functional safety island) is separate from CPU.

Dear @SivaRamaKrishnaNV
Okay it means for safety island, there are separate cores

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