By Jean-Louis Boulanger
It really is presently really effortless for college students or designers/engineers to discover very common books at the a variety of elements of security, reliability and dependability of laptop procedure architectures, and partial remedies of the weather that contain an efficient approach structure. it isn't really easy to discover a unmarried resource reference for some of these features of process layout. in spite of the fact that, the aim of this publication is to offer, in one quantity, a whole description of the entire constraints (including criminal contexts round functionality, reliability norms, etc.) and examples of architectures from a number of fields of program, together with: railways, aeronautics, area, car and business automation.
The content material of the e-book is drawn from the adventure of diverse people who find themselves deeply immersed within the layout and supply (from belief to check and validation), defense (analysis of defense: FMEA, HA, etc.) and review of severe platforms. The involvement of actual international business purposes is dealt with in comparable to a manner as to prevent difficulties of confidentiality, and therefore permits the inclusion of latest, precious info (photos, structure plans/schematics, genuine examples).
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Extra info for Safety of Computer Architectures
For the transmitter, error detection consists of implementing an algorithm on the frame bits in order to generate a CRC, and to transmit these two elements to the receiver. The receiver then needs to perform the same calculation to verify that the CRC is valid. In practice, M is the message corresponding to the frame bits to be sent and M(x) corresponds to the associated polynomial. 16) the transmitted message, that is to say, the original message to which the CRC of k bits was appended. The CRC is such that M’(x)/G(x)=0.
When it is applied to the software, it is important that the diversification of architecture is evident, ensuring that different software will not have the same defects. 3. Redundancy Redundancy is a technique that aims to provide an excess of resources to maintain proper functioning. In general, redundancy is available in three settings: – time: it will take more time than necessary to complete the process. The application will run at least twice on the same computing unit. ). This encoding can be performed to detect errors but also for correction purposes; – hardware: there is more equipment than necessary.
These self-tests concern only necessary functions. This architecture imposes at least two constraints: – self-tests must be chosen with care in order to effectively detect unit F problems; – the software executed by unit F is “classified” as secure and requires the utmost care. 37. Asymmetric architecture Principles 41 This type of architecture has a main advantage of reducing bulk, weight, energy consumption, and cost (unit f being cheaper). The automobile sector (see Chapter 9) goes even further in implementing an asymmetric, three-layer software architecture.