Here's a good book guiding through an implementation of a simple 8 bit processor (based on 8080 architecture) with VHDL: http://www.amazon.com/Design-Computers-

Here's a good book guiding through an implementation of a simple 8 bit processor (based on 8080 architecture) with VHDL: http://www.amazon.com/Design-Computers-Complex-Digital-Devices/dp/0130402672 http://www.amazon.com/Design-Computers-Complex-Digital-Devic... The same author also wrote another book later where he shows a design of ARM like 16 bit CPU with pipelining.