Requirements

Architecture

Base Architecture: RV32I
- M Extension
- C Extension
- Zicsr Extension
- Zifencei Extension
- System instructions: ecall, ebreak, mret.
Extended Architecture: XCrypto
- Support the full set of XCrypto instruction extensions.
Priviledged ISA:
- M mode only.
- Memory mapped mtime and mtimecmp
- CSRs:
  - misa
  - mvendorid
  - marchid
  - mimpid
  - mhartid
  - mstatus
  - mtvec
  - medeleg
  - mideleg
  - mip
  - mie
  - instret
  - cycle / time
  - mtime
  - mtimecmp
  - mscratch
  - mepc
  - mcause
  - mtval
Interrupts:
- Timer interrupt
- Software interrupt
- External interrupt