describes the RISC-V ISA. 31 27 26 25 24 20 19 15 14 12 11 10 0XXX 0xE00-0xE7F Standard read-only 11 00 10XX 0xC80-0xCBF Standard read-only 11 10 0XXX 0x600-0x67F Standard read/write 01 10 10XX 0x680-0x6BF Standard read/write 01 01 0XXX 0x900-0x97F Standard read/write 01 10 10XX 0xE80-0xEBF Standard read-only 11 01 10XX 0x580-0x5BF Standard read/write 01 11 0XXX 0xB00-0xB7F Standard read/write 01 00 XXXX 0x000-0x0FF Standard read/write 10 10 0XXX 0x600-0x67F Standard read/write debug CSRs 01 11 1011 0x7B0-0x7BF Debug-mode-only CSRs 01 11 11XX 0x7C0-0x7FF Custom read/write 11 10 11XX
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