-
There are 4 base standards :
- RV32I -
- RV32E - this is RV32I that has been made for constrained enironments : it has few registers : x0-x15
- RV64I
- RV128I
-
Word referes to the size of the register > Eg A word in a 32bit CPU is 32 bits, A word in 64bit CPU is 64bits.