A four bit microprocessor was designed using an Apollo workstation and MOSIS two lambda design rules. The layout was intended for fabrication with a four level, enhancement mode load, NMOS process. Device operation was verified by breadboarding the microprocessor with 74’OO series CMOS logic parts. Testing of the breadboard showed that all functions operated correctly. However, the final breadboard design indicated the need for revision of the original layout.
"Design, Manufacture and Testing of a 4-Bit Microprocessor,"
Journal of the Microelectronic Engineering Conference: Vol. 4
, Article 10.
Available at: http://scholarworks.rit.edu/ritamec/vol4/iss1/10