I'm reading book on computer architecture by Patterson and Hennessy. Now I'm much interested in designing a real-time working microprocessor. But i didn't have any idea where to start from! I started to learn VHDL so suggest me something from where i can design processor from gate level and implement it on real working hardware.
EDIT: Since I mentioned that I'm a bit familiar with VHDL so simulation using VHDL will be more easy. But what i am actually concerned is that if VHDL simulates my design perfectly will this design also work well on real time hardware(FPGA Board)? What are the precautions to be taken to ensure same OR is there any other software(tool) which is more nearer to reality and considers most of real time challenges in simulation? To be more specific i want to know how engineers at Intel, IBM, Tilera or AMD design, simulate and verify their Processors designs? What are those techniques and processes?