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[/] [neorv32/] [trunk/] [README.md] - Diff between revs 16 and 17
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**Privileged architecture / User mode** (`U` extension, requires `Zicsr` extension):
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**Privileged architecture / User mode** (`U` extension, requires `Zicsr` extension):
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* Privilege levels: `M-mode` (Machine mode) + `U-mode` (User mode)
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* Privilege levels: `M-mode` (Machine mode) + `U-mode` (User mode)
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**Privileged architecture / FENCE.I** (`Zifencei` extension):
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**Privileged architecture / FENCE.I** (`Zifencei` extension):
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* System instructions: `FENCEI`
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* System instructions: `FENCE.I`
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**Physical memory protection** (`PMP`, requires `Zicsr` extension):
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**Physical memory protection** (`PMP`, requires `Zicsr` extension):
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* Additional machine CSRs: `pmpcfgx` `pmpaddrx`
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* Additional machine CSRs: `pmpcfgx` `pmpaddrx`
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