The PMP address registers are CSRs named from pmpaddr0 to pmpaddr15. Each PMP address register encodes the bits [55:2] of a 56-bit physical address as shown in the following figure.
Figure 1. RV64 PMP Address Register Format
Note: Bits [1:0] of PMP address region are not considered because
minimum granularity is four bytes.
For more information about the RISC-V physical memory protection, see The RISC-V Instruction Set Manual, Volume II: Privileged Architecture, Version 1.10.