Siheyuan: Starting from a fitter

Chapter 177
After eating, Li Guocheng sat cross-legged on the bed and started designing the motherboard in his mind.

One after another, this 5-speed CPU parallel computing motherboard has been designed for a week, and the difficulty was just broken yesterday, which is how to communicate between the five CPUs.

In order to maximize the performance of the CPU, Li Guocheng overturned two design plans.In the end, there was no other way. A bus controller was designed. The five CPUs were connected to the bus controller point-to-point. The bus controller was connected to a DRAM array, which could buffer the communication data of the five CPUs.

In order to save space, the DRAM array had to be designed separately, and finally the design idea of ​​​​the memory stick was simply adopted.

The bus controller is also connected to the hard disk for storing data that needs to be recorded.

The bus controller can be understood as a multi-way switch, but each multi-way switch carries a data buffer.

After the plan is determined, it is simulation, simulating the data conflict of simultaneous communication between 5 CPUs, and constantly adjusting the size of the interface buffer until it is satisfactory.

The motherboard design is too simple for Li Guocheng now, because the bus frequency is not high and the requirements for signal integrity are relatively low.However, in order to obtain optimal speed performance, Li Guocheng still considered the design of equal bus lengths.

The significance of impedance matching is actually not great, because the distance of all buses is short enough, less than one-twentieth of the highest frequency wavelength determined by the rising edge of the signal.

Time has entered mid-September, and the designs of the bus controller, memory module and motherboard have been completed, and the corresponding mask templates have been repeatedly confirmed to be correct.

In order for the laboratory to understand Li Guocheng's design, he wrote detailed instructions and user manuals, and conducted in-depth analysis and explanation of the programming concept of parallel computing.

What exactly is such a computer used for?There are so many to mention, such as workstations, servers, multi-target tracking and control terminals, etc.

Everything is ready, all it takes is someone to come.

Next, Li Guocheng resumed carving in the morning, learned about Hong Kong's industrial situation in the afternoon, and started using Pangu language in the evening to design circuit board development tools.

The more well-known ones in later generations are AD and Cadence, so Li Guocheng modeled his designs on their basic functions. Considering the speed of the computer, all of them used two-dimensional line processing.

Adopting the window display style, the design process can use the command line or directly use the mouse.

During the design process, I found that by modifying some settings, it can become a mechanical drawing design tool.Li Guocheng directly developed a sub-window as an example program and provided it to the laboratory for learning, so that they could develop special software for mechanical drawing.

In mid-October, Li Guocheng's assets increased to HK$10, and his stall became famous on Shanghai Street.

One very interesting thing is that on the National Day of China, celebrations were actually seen in many places in Hong Kong. In some places, photos of great people were even hung with banners.

On the National Day, I had an evening date with Brother Hua and Brother Ji. Li Guocheng took it upon himself to cook a roast leg of lamb for everyone, eating a lot of meat and drinking from a big bowl.

The two of them collapsed early and were handed over to their subordinates to take care of them. Li Guocheng returned to the rental house and had another drink with the small landlord.She has no idea about China's National Day.

This made Li Guocheng a little helpless. He remembered that some young people in Wanwan always thought that they were also Xiaozi before they surrendered.

Taking advantage of the drunkenness, Li Guocheng gave the little girl a vivid history lesson.

As a reward for the little girl's serious study, Li Guocheng gave her 100 Hong Kong dollars.After all, he is a man of his word.

One day in mid-October, Li Guocheng had just set up his stall when business came in, asking, "Boss, how do I sell this?"

"Well, it's a southern Cantonese accent, not a local bank in Xiangjiang, but why does the voice sound so familiar?!"

"50 Hong Kong dollars," Li Guocheng quoted habitually, and then he looked up as if he had reacted.

First surprise, then ecstasy.

Zhao Jie stood in front of him with a smile. The excited Li Guocheng stood up and extended his right hand, but Zhao Jie deliberately lowered his face and waved his hand repeatedly, which seemed to outsiders to be refusing to shake hands.She whispered: "Pay attention to your identity!"

Li Guocheng suddenly woke up and retracted his hand in cooperation.

Zhao Jie put down the 50 Hong Kong dollars rolled up together, turned around and left with a rabbit on the shelf.Li Guocheng hurriedly put the Hong Kong dollars into the secret realm.

Li Guocheng sat down calmly on the surface, but his heart was already surging, and he finally found the person he was waiting for.

After finally staying up until noon, Li Guocheng packed up the stall and went to the stall he frequented to order a wonton noodles. After the meal, he returned to the rental house, took out the roll of 50 Hong Kong dollars and found a note in the middle.

There was only an address and simple information about Zhao Jie written on it.Her name in Xiangjiang is Zhao Ailing, she is a senior consultant of Golden Sun Trading Company and is responsible for contacting northern business.

Li Guocheng put on his suit as usual, carried his handbag, and started his daily walk.

Following the address, Li Guocheng came to an old office building with only 6 floors.Li Guocheng came to the third floor and knocked on the door of Lai 3.The door was opened by a young woman.

"Who are you looking for?"

"I made an appointment with Ms. Zhao Ailing."

"Are you Mr. Jackie Chan?"

"Yes".

"please follow me".

Finally I met Zhao Jie, sitting on the sofa and drinking the Longjing tea she had made.Listen to her story.

"Just after you left, small fights occurred several times, but fortunately they were all under control."

"The laboratory was almost dismantled, but fortunately my grandpa kept suppressing it."

"After the leader found out, he lost his temper, and then they calmed down a bit."

"You'd better not meet my mother in the future."

"Everyone in the family is fine, you don't have to worry."

"People were panicking at the beginning of the laboratory. Only after my uncle went there once did everyone feel at ease."

"The Semiconductor Laboratory is now nominally in charge of Gong Wang. In fact, it is Zhao Zhijing who presides over it. Gong Wang, Zhang Tou, Wang Dayong, Zhou Xiaojuan and Yan Jiefang all support it. How dare others dare to explode."

"Sister and Xiao Yu'er asked me to tell you that they miss you. This is a letter from sister to you."

"This is 1 U.S. dollars, which is the activity fund given to you by the organization."

"No need, you have seen that my income is not low," Li Guocheng said while touching his eyes.

Zhao Jie paused for a few minutes and continued to introduce.

"I really didn't dare to recognize you in your appearance at first. Although there was an agreed mark on the stall, I didn't dare to recognize you. I slowly observed your behavior and habits, and I didn't dare to recognize you until the third day. How did you do it? Okay. sharp".

"Some makeup skills. By the way, what is my identity?" Li Guocheng didn't want to continue the topic of facial features.

"Oh, this is your passport. You are Malay-Chinese. You like art. You can check your feet."

Li Guocheng put the passport and introduction materials in his handbag, then took out a big paper bag, and handed it to Zhao Jie, "This must be handed over to the laboratory! There is a letter for your sister in it."

Zhao Jie knew what was inside the paper bag and nodded solemnly.

"You really don't want this money?"

"Thank you to the country for me." Li Guocheng deliberately did not mention the word organization.

After finishing speaking, he didn't dare to stay for too long, turned around and left.

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(End of this chapter)