Add the constant values used in HCL descriptions
Add the id.v
Y86 CPU which only can fetch
Add the rom
Add the sopc
Correct some errors to make it can be simulated
Read six bytes from rom one time
Add the do script to automatic simulate the cpu
Add the valC in the id.v
PC can be changed according to the valP
Now the PC can be updated and the instruction can be fetched.