Siheyuan: Starting from a fitter

Chapter 162 Military Industry Demand

“In the past, we have also approached several domestic research institutes, but they were unable to solve this problem. The solutions they provided were not only large in size, but also had surprisingly high power consumption.

When we measured the total power consumption of your motherboard and the power consumption of your CPU, we found that the power consumption was far lower than our expectations.And what surprises us even more is that the CPU is very highly integrated.

I would like to ask, how highly integrated is your CPU? "This is a common problem in technology, and it is easy to be biased by technical details.

"More than 30000 transistors" is nothing to keep secret.

The two "Si"s took a breath of air-conditioning together. They had been learning about semiconductor trends and knew that the current highest level of integration only has more than 2000 transistors. They did not expect that China was so advanced.

This gives them more confidence.

"Li Gong, we can only rely on you for our needs," the young Xiao Bing said excitedly. Seeing his expression, he wished he could rush forward and hug Li Guocheng, which scared Li Guocheng into a fright.

"Tell me about the specific needs," Li Guocheng quickly turned to the topic.

"Redesign the main board and remove unnecessary components. It is best to control the power consumption within 10W, 5V power supply, need to pre-enter ballistic information, and the interface should be simple. Of course, the control computer also needs to be redesigned."

"The Shuguang 103 model is sufficient. There is no need to redesign it. The interface has been reserved. As for the missile-borne computer, the current structure is definitely not good. The hard disk cannot withstand such a large acceleration."

"At first glance, you are an expert, and there are not many people who know acceleration," Xiao Bing said excitedly.

"I also read a lot of books," Li Guocheng, who let slip, quickly made amends.

"Are there any other needs?" Li Guocheng asked.

"No more for now," the two said.

"I can't guarantee that it will work, but we can try to implement it, maybe three months, and then we will discuss the final plan." Li Guocheng gave a conservative time.

The two looked at each other, their eyes full of surprise.

After seeing the look in their eyes, Li Guocheng knew that he was short on time, and he ignored the difficulty of research and development in this era.It seems that it will take a little more time to implement and deliver in the future.

It seems that FLASH technology must be studied. In the future, the demand for microcomputers in industry and military industry will become more and more urgent.

The two left the rolling mill satisfied.

"Xiao Li, go for it boldly. It doesn't matter if you can't do it by then. After all, so many research institutes can't handle it." Li Huaide patted Li Guocheng on the shoulder and consoled him.

"Okay, Director, I will try my best."

"Our factory can accept military orders, which means that our steel rolling mill has added an insurance. As long as there are no major quality or safety problems, the steel rolling mill will be able to sit back and relax in the next 10 to 20 years."

After the people from the institute left, Li Huaide only now released his inner excitement.As he walked around the room, he waved his right hand, but his left hand brushed against his waist.

What he didn't say was that as long as Li Guocheng was there, as long as the semiconductor laboratory was there, his official career would be smooth.

Li Guocheng returned to the laboratory and fell into deep thought.

The development of non-volatile memory in later generations started with PROM, then EPROM, and now EEPROM.

PROM can only be written once.

EPROM can be restored by irradiating the chip with ultraviolet rays of a specific intensity.As you have seen, a window is opened on the surface of the chip for ultraviolet erasing.

EEPROM is an electrically erasable read-only memory and is now a mainstream application. NOR FLASH and NAND FLASH are classified into this category.

NOR FLASH has fast reading speed, high unit cost, can run code directly, and prefers on-chip code storage.

NAND FLASH has a large capacity, slow reading speed, and low unit cost. It prefers large-capacity storage, but it is error-prone and needs to be coordinated with security algorithms.

The USB flash drive is NAND FLASH.

When I was in college, I learned the manufacturing principles of PMOS, NMOS and floating gate MOS, but had no understanding of PROM and EPROM.And since he knew the development direction of future generations, Li Guocheng chose to study NOR FLASH directly.

The main reason is that NOR FLASH is more suitable to be placed inside the chip. In the future, the program will be directly designed to store FLASH inside the chip.

The principle of FLASH is relatively simple. A floating gate is added between the G electrode and the D/S channel. The floating gate is similar to an electrode wrapped by an insulator. Charges are injected on the floating gate, and the D/S channel is turned on, representing '0' ;Discharge, D/S channel is closed, representing '1'.

Because the floating gate is insulated, charge is not easily lost.

Li Guocheng did not choose to study FLASH before. The main reason was that he had no idea how to implant a floating gate on PMOS, but now he can't get around it and can only bite the bullet.

In the following time, Li Guocheng's main work is to study how to implant floating gates.

Li Guocheng conceived several plans, but gave up three of them because the simulations in his mind failed, and the remaining two were abandoned in actual production.

What is abandoned in production is that an insulation layer is implanted during packaging, and then an electrode is implanted.In actual operation, it cannot meet industrial production, the process is too complex, and the requirements for human operation ability are too high.

Ten days passed quickly. Li Guocheng, who was at a loss for what to do, wandered into the lithography room and watched Zhang Tou oxidizing the wafer.As I looked at it, I suddenly burst into laughter. It really took no effort at all.

Secondary oxidation can perfectly solve this problem, and the industrial production process is also mature, just adding an oxidation process.

Just do it as soon as you think of it. It only took one day to complete the production of a FLASH unit. After actual testing, all indicators fully met the design requirements.

The next task is very simple. It has one less NMOS than DRAM. It has the same three-layer structure and the capacity reaches 1MB, which is larger than DRAM.

The interface adopts a parallel port and can be directly mounted to the external bus of the CPU.

Li Guocheng completed the design and simulation of the chip in another week.When he was preparing to engrave the mask, Wu Liankui called to inform him that he would attend an exchange class organized by the department in the evening.

Li Guocheng walked out of the office and came to the software group next door. "Xiao Zhou, let me inform everyone. Remember to go to class tonight and don't be late."

"Time is too urgent, how can we get there?" Zhou Xiaojuan said distressedly.

"Call everyone, let's have dinner early. Director Wu has already greeted the canteen today."

As soon as she finished speaking, Zhou Xiaojuan happily ran with her lunch box to inform the other two.

After dinner, just after get off work, there were four people and three bicycles. Yan Jiefang took Zhang Zhijing with him on the bicycle. They drove all the way and finally arrived at the ministry training point at 4:6.

The fourth conference room has been transformed into a classroom, with a row of tables and a row of benches.There is a blackboard made of large wooden boards standing on the podium.

The four people came neither early nor late. There are only about 4 people in the classroom now. They are divided into four piles and have nothing to do with each other. They should come from four units.

Li Guocheng asked the three of them to sit in the first row, and he sat in the last row.

In the next 10 minutes, more than 20 people came in one after another, and all the seats in the classroom were filled.Li Guocheng briefly hugged, there were about 35 people.

At this time, the door of the conference room was pushed open, and a gust of cold wind sent a middle-aged man in.

thanks for your support! ! !Please recommend!Asking for a monthly ticket!Please comment!
　Sorry, there were too many things going on yesterday, which broke the previous rhythm. I am only posting Chapter 1 now, sorry for that.

　　
　
(End of this chapter)