MICROARCHITECTURE OF THE MC 68000 AND EVALUATION OF A SELF CHECKING VERSION.

Abstract

The microarchitecture of the MC 68000 microprocessor is examined, including technological and system characteristics, resources, instructions, signals exceptions and test mode. The internal architecture is detailed: data processing section and control section. Next basic rules for the design of self-checking NMOS circuits are briefly given. These rules are based on fault hypotheses including for example transistors s-open/s-on, shorts between aluminum lines, etc. . . The application of these rules to the design of a self-checking version of the MC 68000 is not detailed, but an evaluation of what should be such a redesign is given. The silicon overhead is detailed.