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Microprocessor system and method for operating microprocessor system

A microprocessor and equipment technology, applied in the architecture with a single central processor, electrical digital data processing, instruments, etc., can solve problems such as unauthorized monitoring

Inactive Publication Date: 2005-05-18
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a problem that with proper measurement methods, the data can be monitored without authorization

Method used

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  • Microprocessor system and method for operating microprocessor system
  • Microprocessor system and method for operating microprocessor system
  • Microprocessor system and method for operating microprocessor system

Examples

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Embodiment Construction

[0017] in accordance with figure 1 The microprocessor includes a data bus 1, through which various functional units of the microprocessor exchange data, control each other or program information. The data bus 1 includes a number of lines for communicating useful and control information. The central processing unit 2 controls program sequences and performs calculations. Data and program information can be permanently stored in the ROM memory 3 in an immutable manner or in the E 2 PROM 4. Volatile data is stored in the RAM memory 5, and in addition, at least one type of peripheral unit 6 is provided to receive data from the outside or output data to the outside. All functional units are arranged on a single integrated semiconductor chip. Units 2, . . . , 6 are all connected to bus 1 and exchange information to be processed via said bus 1. The access control to the bus is monitored by the bus control unit 7 .

[0018] The data stored in the memories 3, 4, 5 are encrypted. ...

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PUM

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Abstract

In a microprocessor device, data is temporarily stored in a high speed memory (8) or register bank (9). Each assigned cryptographic unit (81, 82; 91) ensures that data is encrypted / decrypted when the ultrafast memory (8) or the register bank (9) is accessed. If the high-speed memory (8) or register (9) no longer contains any valid data to be read, the keywords available here are changed. Added protection against unauthorized monitoring of data and program sequences.

Description

technical field [0001] The present invention relates to a microprocessor device with a processing unit and a memory connected to the processing unit for performing read or write access operations. [0002] The invention also relates to a method for operating a microprocessor device with such a memory. Background technique [0003] Microprocessors require a memory to store data or programs to be processed in a permanent or volatile manner. During program execution, the microprocessor accesses the memory in order to load currently required program parts or data. Microprocessors are used in particular in systems with high security requirements, for example in chip cards. The microprocessor is used in particular for encrypting data traffic or for performing other applications where the security of the owner of the chip card is critical. Here, data and programs that are important for safety are stored in volatile and non-volatile memory units of the microprocessor. In order t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F12/14H04L9/00G06F12/08G06F15/78G06F21/75
CPCG06F12/1408G06F21/75
Inventor B·加梅尔O·克奈弗勒H·塞德拉克
Owner INFINEON TECH AG
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