"In the past, we have also found several domestic research institutes, but they have no way to solve this problem, and the solution given is large in size and has 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 much lower than we expected. And what surprises us even more is that the level of CPU integration is very high.

I would venture to ask, how integrated are your CPUs? This is a common problem of technology, which is easy to be deviated by technical details.

"More than 30,000 transistors", which is also nothing to keep secret.

The two of them took a breath of cold air, they have been understanding the dynamics of semiconductors, and they know that the highest integration level is only more than 2,000 transistors, but they didn't expect China to be so advanced.

This gives them more confidence.

"Li Gong, our needs can only depend on you", the young Xiao Bing said excitedly, looking at that look, he couldn't wait to pounce on him and hug Li Guocheng, which scared Li Guocheng.

"Let's talk about specific needs", Li Guocheng hurriedly turned to the topic.

"Redesign the motherboard, remove unnecessary devices, power consumption is best controlled within 10W, 5V power supply, pre-input ballistic information is required, and the interface should be simple. Of course, the control computer also had to be redesigned. ”

"The Dawning 103 is fine, there is no need to redesign, and the interface has been reserved. As for the missile computer, the current structure is definitely not good, and the hard disk cannot accept such a large acceleration."

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

"I also read a lot of books", Li Guocheng, who said that he had leaked his mouth, hurriedly remedied.

"Any other needs?" , Li Guocheng asked.

"Not for the time being," the two said.

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

The two looked at each other, full of surprise.

After seeing the eyes of the two, Li Guocheng knew that he had less time, and he ignored the difficulty of research and development in this era. It seems that it will take a little more time to realize and deliver later.

It seems that it is necessary to study FLASH technology, and the demand for microcomputers in industry and military industry will become more and more urgent in the future.

The two left the rolling mill satisfied.

"Xiao Li, do it boldly, it doesn't matter if you can't do it then, after all, so many research institutes can't do it", Li Huaide patted Li Guocheng's shoulder and comforted.

"Okay, Director, I'll do my best".

"Our factory can accept orders from the military, which means that we have added an insurance to our rolling mill, as long as there are no major quality or safety problems, the rolling mill will have peace of mind in the next 10~20 years."

After the people of the institute left, Li Huaide only now released the excitement in his heart. As he walked around the room, he waved his right hand, but his left hand was rubbed against his waist.

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

Li Guocheng, who returned to the laboratory, fell into deep thought.

The development idea of non-volatile memory in later generations is to start from PROM, to EPROM, and then to the current EEPROM.

The PROM can only be written once.

EPROM can be reduced by irradiating a chip with a specific intensity of ultraviolet light. It's what you've seen, opening a window on the surface of the chip for UV erasure.

EEPROM IS ELECTRICALLY REWRITABLE READ-ONLY MEMORY, WHICH IS NOW THE MAINSTREAM APPLICATION, AND NORR FLASH AND NAND FLASH ARE GROUPED INTO THIS CATEGORY.

NOR FLASH HAS FAST READ SPEED, HIGH UNIT COST, AND CAN RUN CODE DIRECTLY, PREFERRING ON-CHIP CODE STORAGE.

NAND FLASH has a large capacity, slower read speed, and low unit cost, and is more inclined to large-capacity storage, but it is prone to errors and needs to cooperate with security algorithms.

A USB FLASH DRIVE IS NAND FLASH.

When I was in college, I learned the manufacturing principles of PMOS, NMOS and floating gate MOS, but I did not understand PROM and EPROM. And since he knew the direction of development in the future, Li Guocheng chose to study NOR FLASH directly.

The main reason is that NOR FLASH is more suitable for inserting into the chip, and the chip will directly design the program to store the FLASH inside.

The FLASH principle is relatively simple, a floating gate is added between the G pole and the D/S channel, the floating gate is similar to an electrode wrapped by an insulator, and an electric charge is injected into the floating gate, and the D/S channel is turned on, representing '0', and discharged, the D/S channel is closed, representing '1'.

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

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

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

Li Guocheng conceived several plans, but 3 were abandoned if the simulation was not passed in his mind, and the remaining two were given up in actual production.

For example, an insulating layer is implanted during the encapsulation, and then an electrode is implanted. In actual operation, it cannot meet the needs of industrial production, the process is too complex, and the requirements for human operation ability are too high.

10 days passed quickly, and Li Guocheng, who had nothing to do, slipped into the lithography room and watched Zhang Tou oxidizing the wafer. Looking at it, I suddenly laughed, it really didn't take any effort.

Secondary oxidation can perfectly solve this problem, and the industrial production process is also mature, but only an oxidation process is added.

It only took one day to make a FLASH unit, and the actual test showed that the indicators fully met the design requirements.

The next job is very simple, one less NMOS than DRAM, the same three-layer structure, the capacity is directly 1MB, which is larger than DRAM.

The interface uses 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 about to carve the mask, Wu Liankui called to inform him to participate in the exchange class organized by the ministry in the evening.

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

"Time is too urgent, how can we go", Zhou Xiaojuan said distressedly.

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

As soon as the words fell, Zhou Xiaojuan happily took the lunch box and ran to inform the other two.

After dinner, just after getting off work, 4 people and three bicycles, Yan Jiefang rode a bicycle with Zhang Zhijing, galloping all the way, and finally arrived at the training point in the ministry at 6 o'clock.

The fourth conference room has been converted to look like a classroom, with a row of tables and a row of benches. On the podium stood a blackboard made of large wooden planks.

4 people came not early or late, there are only 10 people in the classroom now, and there are 4 piles, which are unrelated to each other, and they should be 4 units.

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

In the next ten minutes, more than 20 people poured in, and all the seats in the classroom were full. Li Guocheng gave a simple look, about 35 people.

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

Thank you all for your support!! Ask for recommendations! Ask for a commuter pass! Ask for a review!

I'm sorry, there were too many things yesterday, breaking the previous rhythm, and now I'm just sending the first chapter, forgive me.

(End of chapter)