NX25 is Andes CPU IP to adopt RISC-V architecture.
  
  Features
  ========
  
  CPU Core
   - 5-stage in-order execution pipeline
   - Hardware Multiplier
  	 - radix-2/radix-4/radix-16/radix-256/fast
   - Hardware Divider
   - Optional branch prediction
   - Machine mode and optional user mode
   - Optional performance monitoring
  
  ISA
   - RV64I base integer instructions
   - RVC for 16-bit compressed instructions
   - RVM for multiplication and division instructions
  
  Memory subsystem
   - I & D local memory
     - Size: 4KB to 16MB
   - Memory subsyetem soft-error protection
     - Protection scheme: parity-checking or error-checking-and-correction (ECC)
     - Automatic hardware error correction
  
  Bus
   - Interface Protocol
     - Synchronous AHB (32-bit/64-bit data-width), or
     - Synchronous AXI4 (64-bit data-width)
  
  Power management
   - Wait for interrupt (WFI) mode
  
  Debug
   - Configurable number of breakpoints: 2/4/8
   - External Debug Module
     - AHB slave port
   - External JTAG debug transport module
  
  Platform Level Interrupt Controller (PLIC)
   - AHB slave port
   - Configurable number of interrupts: 1-1023
   - Configurable number of interrupt priorities: 3/7/15/63/127/255
   - Configurable number of targets:  1-16
   - Preempted interrupt priority stack