Intermediate Software Designer Exam Preparation---Computer Composition and Architecture 3

① Disk working principle

Calculation problems

②Computer bus

concept question

③ System reliability analysis

Calculation reliability

④ check code

• Code distance: refers to the different number of digits between two codewords. For example, the code distance between 1010 and 1111 is 2 because they differ in the second and third digits. In information transmission, the larger the code distance, the easier it is to detect and correct errors.

• In order to detect e bit errors in a code group, the minimum code distance d should satisfy: d>=e+1

• In order to correct t errors in a code group, the minimum code distance d should be satisfied: d>=2t+1

CRC cycle check code

Fake