[2023 Jerry technology approval test questions in advance] ~ questions and reference answers

0. the front

The written examination is still a little difficult , The investigation of basic knowledge is in a different form , All in all , Everything changes , After mastering the basic knowledge, I'm not afraid .

There are altogether examination papers 6 A big question , No multiple choice questions , The difficulty rises instantly , Ha ha ha ha ！！！

The following is a specific topic , Just memories , Ha ha ha ！！！

1. subject

The first question is

Gave a piece of code , Finally, I ask you what the result is ？

Something like that ：
char a, b;
unsignd char c, d;
The first is to give a a yes 1,c yes -1, Calculate it b=a+c and d = b

The second is to give a a=-1, c=-1, a,c Move each one to the right , Finally, it's this b=a+c and d = b

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The second question is

Short answer ： About establishing time and keeping time , Drawing required , analysis

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Third question

Short answer ： About metastable , What is metastable ？ What's the harm ？ How to eliminate ？

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Fourth question

Calculation ： Investigation of sampling theorem .

The sampling frequency is given 100khz, First, I gave the input 1khz, Ask where you got the signal ？ Input again 60khz, Ask where you got the signal ？

I think the answer should be ：1khz and 40khz

analysis ： Sampling theorem ===> The sampling frequency is greater than or equal to twice the highest frequency , So the input is 1khz Satisfy , It's in 1khz Complete signals can be acquired ; And input 60khz, Does not satisfy the sampling theorem , So the calculation method is ： The absolute value （n * 100khz - 60khz ）= 40khz, It means to find the nearest one .

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Fifth question

Programming ： Processing across clock domains , A single bit , One multi bit , Just pay attention ！

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Code writing reference this

Sixth question

Programming ： use C Language sorts arrays .

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Statement

All my series of articles , Just for learning , Not for commercial use , If there is any infringement , Please inform , To delete ！！！

I mainly record the learning process , For myself to review , Then it is to provide reference for future generations , No joy, no spray. ！！！

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