Super Copy of Great Power Technology

Chapter 78 Modifying the Design Drawing

For the next two days, Qiao Ruida sat in front of the computer and searched for bugs in the chip design drawings.Even meals are bought by employees and delivered to the office.On the morning of the third day, Qiao Ruida finally found the problem among the dense lines and nodes.It turned out that it was a line connected to the storage reading module. It was connected in the wrong position, causing some module functions to fail. Only some memory pages of the flash memory chip could be read and written. It is not surprising that the capacity has shrunk.

Once you find the problem, it's very simple to fix it.Just erase the connection line and draw a new one in the correct position. That's it.After the modification was completed, Qiao Ruida did several more simulation tests, focusing on the reading and writing of flash memory chips. Only after they all passed the test with perfect scores did she feel relieved.After doing all this, Qiao Ruida stood up, stretched, and exhaled a long breath.

"Phew - it's finally done. I'll take it for the second tape-out tomorrow. I hope this time it will be smooth sailing and the tape-out will be successful."

"Ruida, are you done? Then finish your lunch quickly."

Just as Qiao Ruida moved her hands and feet, Du Qingqing's voice sounded from behind, startling him.

"Qingqing, aren't you preparing for the final exam? Why are you here at the company?"

"It was Sister Liu who called me. She said you were sitting in front of the computer and I don't know what you were doing. You haven't left the office door for two days and two nights. I was afraid that something would happen to you, so I bought some food and rushed Come to the company and see you."

As she spoke, Du Qingqing opened the insulated food box she had brought with her, and an alluring fragrance immediately spread throughout the office.

Qiao Ruida sniffed and praised: "This is the smell of roast duck. It's really delicious. Qingqing, you understand me and my hobbies. Have you had lunch? Do you want to eat some together?"

A plate of hot roast duck, a plate of duck neck, a plate of duck gizzards, a bowl of seaweed and egg drop soup, a plate of sweet noodle sauce, and several rolls filled a small coffee table.Du Qingqing opened a pair of disposable chopsticks and placed them in front of Qiao Ruida.

"You can eat it yourself. I had already eaten at school before coming here. I'm not hungry yet."

"Then you're welcome. I've been busy all morning, and now I'm so hungry that I can swallow a cow." At that moment, Qiao Ruida picked up the chopsticks and started to eat happily.

"Ruida, what have you been busy with these days? It's been a long time since you went to class or went shopping with me?"

Qiao Ruida held a duck leg in her mouth, turned around, picked up the half-finished MP3 player on the desk, put it into Du Qingqing's hand, and then said inarticulately: "This is what I have been working on for more than a month. Just make a defective product.”

"What is this, an electronic watch, a perpetual calendar, or a temperature and humidity meter?" Du Qingqing had limited knowledge of electronic products. After playing with it for a long time, he still couldn't figure out what it was.

"No, this is an MP3 music player. Press and hold the first button to turn it on. Press the third button to play music. Plug in the headphones here and you can hear the sound." Qiao Ruida stretched out her hand. , guiding Du Qingqing on how to use this player.Hearing the beautiful music, Du Qingqing narrowed her eyes in enjoyment.After listening to the song, she took off her headphones and asked curiously: "You made this thing. It doesn't look too complicated. Why does it take so much time?"

"I not only designed the circuit board and welded the circuit, but also designed and manufactured the main control chip, which of course took a longer time." Qiao Ruida stretched out her finger and tapped the square black chip on the circuit board, and said quite proudly.

"So that's it. Is this the integrated circuit that your microelectronics major wants to make? A black bump the size of a fingernail can play music. It's really magical." Du Qingqing took the player in his hand and played with it fondly. After a while Previous song, next song, fast forward, and sequential playback.

"Where is this? The computers and mobile phones we use have many functions, and they are also composed of many integrated circuits. One day in the future, I will also design chips for computers and mobile phones." Qiao Ruida enjoyed the food , while communicating with Du Qingqing, he inadvertently exposed his ambition.

"This music player works normally and the sound quality is very good. How can you say it is a defective product?"

"There is a problem with the main control chip. The 4G flash memory can only read 156M and can't save a few songs. This is the first tapeout. I have been busy these two days and forget food and sleep, just to find out what the problem is. Where."

"Have you found it?"

"Of course I found it. Just before you came, I just found the place where the bug occurred and made modifications. Tomorrow I will go to the Daxing campus for the second tape-out. This tape-out will cost 600 million. I don’t know if the cost will be recovered in the end.”

Two or three years ago, MP3 and MP4 players were still popular products and had no worries about sales.But 10 years later, smartphones have rapidly become popular and have become the entertainment terminal for most people. Listening to music and watching videos are all done on mobile phones. The audience for MP3 and MP4 players has shrunk sharply, and sales have plummeted.If Ruida Technology now launches an MP3 player or MP3 master decoding chip and puts it on the market, it is hard to say how much sales it will have and whether it will be able to recoup the research and development costs of the chip.

"Six million, do you need so much? I didn't expect that it would cost so much money to develop such a small chip."

"Yes, this is just a 45nm process chip, and one tape-out costs 600 million. In the future, when the process technology evolves to 28nm, 14nm, 7nm, and 5nm, the cost of tape-out will double. One day, tape-out will It’s not uncommon for the cost to rise to hundreds of millions of dollars. By then, ordinary companies will not be able to get involved in the field of high-end chip research and development, and only the top international giants will be able to settle in it.”

After lunch, Qiao Ruida did not continue working. Instead, she took Du Qingqing to go shopping. When she was tired from shopping, she went to see a movie.The film is "Harry Potter and the Deathly Hallows", the last film in the Harry Potter series. Although Jorelda has watched this film more than once in her previous life, now that she has watched it again, she is still quickly immersed in it and following the plot. The heart is ups and downs, and there are many emotions. This is probably the charm of classics.

At nine o'clock in the evening, a Mercedes-Benz commercial vehicle parked at the gate of Peking University. Qiao Ruida and Du Qingqing got out of the car one after another, and then walked into Yanyuan hand in hand.

"Qingqing, are you happy today?" "I'm happy. I haven't been out shopping for a long time. I go out once in a while and feel so comfortable all over."

(End of this chapter)