One-chip CPU

Details One-chip CPU One-chip CPU

1996-04-29

1999-01-12

Donaghue, Larry D.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

39580032, 395186, G06F 1214

Patent

active

058601236

ABSTRACT:
A one-chip CPU (Central Processing Unit) includes a program counter, a built-in inside memory, a gate circuit, a decode circuit, and an inside bus. The program counter is connected to the inside bus and built-in memory while the memory is connected to the decode circuit via the gate circuit. Further, the program counter is connected to the gate circuit. When the logical value of the program counter is representative of the built-in memory, an inhibit signal is not fed to the gate circuit. However, when the logical level is representative of an outside memory, the inhibit signal is fed to the gate circuit so as to close it. As a result, the gate circuit obstructs the flow of data from the built-in memory. This protects data stored in the built-in memory from illicit access.

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