Title:
PROCESSOR AND USE THEREOF
Document Type and Number:
Japanese Patent JPS61105657
Kind Code:
A
Abstract:
A device (5) for attachment to a main processor (2) and a method for their operation are disclosed. The device comprises a store (7) for storing secure data essential for the correct action of a computer program, the store being arranged such that the secure data is unreadable by a user, and the secure data defining at least in part one or more steps of the computer program. A subsidiary processor (10) is provided for carrying out the or each step defined by the secure data; and interface means (6) enables data to be received by the device (5) from the main processor (2) and to be transferred from the device (5) to the main processor (2) whereby the device and the main processor together enable the computer program to run. In use, the main processor (2) determines when a step in the computer program is to be found in the device (5) and passes data and a program counter identifying the next step to the device (5). The subsidiary processor (10) carries out the step or steps indicated by the program counter on the transferred data; and passes resultant data and a new program counter to the main processor (2), the new program counter indicating the next step or steps of the computer program to be carried out by the main processor.
Inventors:
KENESU JIYON FUIFUIIRUDO
Application Number:
JP20674185A
Publication Date:
May 23, 1986
Filing Date:
September 20, 1985
Export Citation:
Assignee:
KENESU JIYON FUIFUIIRUDO
International Classes:
G06F1/00; G06F12/14; G06F21/00; G06F21/22; G06F21/24; (IPC1-7): G06F12/14
Attorney, Agent or Firm:
Akihide Sugimura