Siheyuan: Starting from a fitter

Chapter 163 The birth of NOR FLASH
Li Guocheng is holding a book with his head down. To others, he looks like he is studying with his head down, but in fact, he is remembering his recent past of studying ADC chips.

The working principle of ADC is to convert analog continuous input signals into discrete digital signals, which facilitates computer analysis of analog signal characteristics.

To design an ADC, you need a DAC (digital-to-analog converter), and to design a DAC, you need an op amp.

This was sorted out by Li Guocheng in the past six months by recalling his university knowledge. The operational amplifier is also called an operational amplifier. After searching for information, it was found that Bell Labs had designed and patented the electronic tube as early as 1941.

After Li Guocheng got the circuit diagram, he was ready to redesign it using transistors.

When I was preparing to design the op amp, I felt that the classroom suddenly became quiet, and then I heard a cough.Li Guocheng retracted his thoughts and looked up at the podium.

A very familiar person was standing there, looking around at the students sitting there. When everyone's attention was focused on him, he said:

"Comrades, good evening, everyone, I am your class teacher Wang Peiyi. Everyone knows the goal of our technical exchange class, so I won't go into details here.

You are all outstanding young people in various units. I hope that in the next year's technical exchanges, you will be improved and you can better work for the rise of China."

Everyone consciously applauded enthusiastically. This has become everyone's instinct. No need to remind, everyone knows to applaud at that moment and cheer at that node.

"Before class starts, let's introduce ourselves and elect your monitor. Then we'll start from the first row on the left."

"My name is Tang Danian. I am an 11th grade technician in the precision laboratory of the steel rolling mill. Nice to meet you all." After speaking, he turned back with a smile and nodded to Li Guocheng in the back row.

It turned out that the last spot was given to him, and it was quite interesting to him. He probably saw Zhou Xiaojuan signing up, so he signed up too.

"My name is..."

"My name is..."

"My name is Wen Juan. I am a grade 16 intern at the Capital No. [-] Machine Tool Factory. Nice to meet you all. I was the monitor when I was in middle school, so I recommended myself to run for monitor."

A very beautiful, curvaceous, and tall girl about 25 years old introduced herself grandly, with a clean tone.

My name is. . . "

"My name is Li Guocheng, a level 5 fitter in the steel rolling mill laboratory. Nice to meet you all." Li Guocheng stood up and briefly introduced himself.

When Wang Peiyi saw Li Guocheng, he didn't seem to express anything special, but Li Guocheng obviously felt that his smile became much more sincere, and he nodded towards Li Guocheng unobtrusively.

After everyone introduced themselves, Wang Peiyi coughed again, "Comrades who are willing to serve you can sign up for the squad leader election."

As soon as the words fell, two people raised their hands. One of them, a fat young man surnamed Wang, saw the other person raised his hand, and slowly put it down unwillingly.

The other has a slender figure, a slightly feminine face, slightly thin lips, and a calm expression.

After waiting for a few minutes, Wang Peiyi saw that no one else raised their hands, so he glanced at Li Guocheng several times. Seeing that he had no reaction, he said, "Wen Juan and Ouyang Jianguo are running for squad leader. Each of you will have three minutes to introduce yourself. Then everyone votes, and the one with the most votes wins.”

Li Guocheng felt a chill, and Ouyang Jianguo always felt like coffee with garlic.

"Then I'll come first," Ouyang Jianguo said.

"Although I am a grade 13 technician at a precision instrument factory, my dad is the director of ***," he said very briefly, and then he looked around proudly.

"I am an ordinary technician, but I have a heart to serve everyone and have many years of experience in class management. I can assist teachers in completing teaching tasks." Wen Juan sat down after speaking, with just the right amount of control.

Li Guocheng has no interest in these competitions, but he does not despise them either. Everyone has come from this 2B age.

After some voting, Wen Juan won with an advantage and became the squad leader.Comrade Jianguo looked angry.

"Wen Juan is the squad leader, Ouyang Jianguo should be the study committee member," Wang Peiyi came out to talk.

"Let me talk about the future study arrangement. Every Tuesday and Thursday night, the class starts at 6:30 and ends at 8:30. The learning content of this course includes Marxist philosophy, Mao Xuan, engineering mechanics, mechanical design foundation and metal technology, a total of 5 courses.

The people who have technical exchanges with you are authoritative engineers who have been engaged in technical research or manufacturing for many years. I hope that you will have serious exchanges in the future.Please study on your own for the four years of middle school, and the exam will involve middle school mathematics, physics and chemistry."

Since then, Li Guocheng and the others have participated in technical exchange classes organized by the Department of Mechanical and Electrical Engineering every Tuesday and Thursday.During this period, the squad leader organized several activities, mainly visiting and studying in several large factories.

Of course, several shitty things happened along the way. Under Li Guocheng's personal example, the five people in the steel rolling mill behaved like they had nothing to do with themselves and just ignored them.Very quiet, not outstanding, not lagging behind, pretending to be a transparent person.

The knowledge taught in class is already very basic to Li Guocheng. He has studied it many times and has mastered it.If it weren't for the certificate, he would have stopped coming.

So every time, when Li Guocheng looked up at the blackboard, he was thinking about chip design.

In early April 1969, Li Guocheng received the test report of the NOR FLASH FC4M1 chip, and the results once again proved the power of telekinesis simulation.

Then call Xiao Bing.

In Li Huaide's office, this time there were only Li Huaide, Li Guocheng and Xiao Bing, and Wu Liankui started to use acupoints again.

"Comrade Xiao Bing, this is a memory chip with a capacity of 1MB. You can use a 103 computer to write parameters in advance, and the CPU reads the pre-stored information to control the missile."

Xiao Bing looked down at a small chip in his hand, his eyes filled with disbelief.

"You said the capacity of this chip is 1MB. Is it a big B or a small b?" Xiao Bing asked breathlessly.

"Big B".

"That's enough. In fact, the control data is currently only 100KB. Since this chip has reached 1MB, we can consider adding some information," Xiao Bing said happily.

"What kind of interfaces are needed?" Li Guocheng asked.

Xiao Bing thought for a while. Among the 10 digital outputs, two of them require 100mA driving capability, and the other eight require 8mA.

Li Guocheng thought for a while and concluded that there was no problem. The total power consumption was not expected to exceed 3W.

Xiao Bing was shocked again.He already felt that the steel rolling mill was powerful enough, and it was only through this cooperation that he discovered the abnormality of the steel rolling mill laboratory.

It only took more than a month to give a perfect solution, and the result far exceeded expectations.He has already made up his mind that he will cooperate well with the rolling mill and Li Guocheng in the future.

"I wonder what the final selling price was?" Xiao Bing asked.

"This is yours to ask our Director Li," he said, pointing to Li Huaide.

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(End of this chapter)