Chapter 51: Sequential Logic Circuits The Scouts go into action

When preparing the timing circuit lesson plan, Zhang Zhimu spent a lot of effort. When I was studying this course in school, I felt that these things were very messy, and I could barely pass the test. After work, I also need to use some places to find information. Now it takes a lot of effort to sort it out systematically. Fortunately, King Zhou resolutely did not need Zhang Zhimu to accompany him, and Princess Anping led him around during the day, and at night he looked at the rare books borrowed from the Yaogang Library under the lamp. Sometimes King Zhou can also soak in the museum for a whole day. At noon, I also followed the museum staff to eat the working meal, and kept saying that the working meal was delicious. Later, the acting king of Datong came, and the two of them had company. Although the two are counted as a generation apart, the two princes are about the same age, and they have endless words together. From inside and outside the family to major events in the world, they can be regarded as having someone to talk to. Except that sometimes, the two princes often put on makeup and sneaked out, which made Zhang Zhimu a little worried, and Zhang Zhimu didn't care about them. As for the affairs in the north, Zhang Zhimu didn't worry about it. The fighting in the south was basically over, and the Ming army never came to cause trouble again. The staff of the branch in Xuzhou also went back. Li Yan, Li Mao, Qin Peng, Fan Chengkun, and Liu Chenghuang all gathered in Hanyang. They want to build a political, military, and economic center here, and there are unique conditions here. From here, it can not only echo with the kiln gang in the north, but also go straight to the south of the Yangtze River, and the Yangtze River waterway can extend in all directions.

Large-scale construction has already begun. The goods of the kiln gang have been transported in a steady stream. Lu Bingyi's men were looking for the sites where the cement plant and the steel plant were built. This is a pillar industry for large-scale construction. Li Dong is now fully organizing the construction of the Baotou Iron and Steel Plant, and as soon as it is put into operation, he will immediately bring people here to build a new steel base.

People from all walks of life in the Central Plains seem to welcome the arrival of the kiln, and it seems that the influence of the kiln people has played a role over the years. In Li Mao's telegram to Zhang Zhimu, he said: In the past, I thought that soft power was just a rhetoric, but now it is clear that soft power can become powerful hard power when conditions permit. We have experienced this deeply in Hanyang. All the people we have come into contact with have welcomed us from all walks of life, and these people are definitely not afraid of our pretentious gestures.

Zhang Zhimu was even happier that Li Maoneng had such a deep understanding.

Yangchang urged Zhang Zhimu to tell them about the timing logic circuit several times, and finally looked forward to Zhang Zhimu.

Zhang Zhimu told them: "Learning digital circuits has now reached the stage of tackling tough problems. Once this is fully digested, we can actually develop a computer. ”

Zhang Zhimu's words mobilized everyone's enthusiasm, and they opened their notebooks and took out pens. Fountain pens are still valuable, and everyone is proud to have a good fountain pen. It's so convenient to use.

Zhang Zhimu drew a schematic diagram of the structure of a sequential circuit on the blackboard. Combined with this diagram, the characteristics of sequential circuits and the differences between them and combinatorial logic circuits are introduced.

The characteristic of a sequential circuit is that it is composed of a combination of logic circuits and flip-flops, and the state of the circuit is related to time.

There are two types of sequential logic circuits:

The first is the synchronous sequential logic circuit: each flip-flop is triggered by the same clock pulse;

The second is the asynchronous sequential logic circuit: the trigger pulse of each flip-flop is different.

In order to introduce the sequential circuit analysis, Zhang Zhimu gave a detailed explanation of the trigger. This is because flip-flops are the basic components of sequential logic circuits.

The flip-flop is a kind of unit circuit with memory function, which is composed of gate circuits and specially receives and stores the output 0 and 1 codes. There are several types of bistable, monostable, and unstable.

Firstly, the most basic RS flip-flop is introduced, and the synchronous RS flip-flop with a clock signal is added. Then, the synchronous JK flip-flop, the synchronous D flip-flop, the edge-triggered JK flip-flop, the D-flip-flop for maintaining blocking, the T-type flip-flop, the T′-type flip-flop, the master-slave RS flip-flop, the master-slave JK flip-flop, and the master-slave JK flip-flop with zeroing and preset are introduced.

Zhang Zhimu's lectures to these people are completely different from when he listened to them, because after studying at that time, these boring things can be passed as long as they can pass the exam. But now his students, after learning it, need to use transistors to build gates, and then make these triggers. These things have to be eaten thoroughly. Fortunately, Zhang Zhimu often uses these circuits in his work, and the performance of various triggers is basically clear, and he can sort it out a little.

The analysis of the sequential circuit, as well as the CP clock expression, the driving equation of each flip-flop, and the driving equation of the sequential circuit, Zhang Zhimu spent a lot of time explaining to you, because this is a very important thing. However, according to everyone's reactions, Zhang Zhimu felt that the effect was good, and he felt that everyone could still roughly keep up with their own ideas. Therefore, Zhang Zhimu told you about the composition and principle of various counter circuits. Then Zhang Zhimu focused on registers. This is something that computers will be inseparable from in the future, and it is something that monitors cannot do without if they want to display content.

In fact, the registers are composed of the D flip-flop or RS flip-flop mentioned earlier. Generally, according to the working mode, it is divided into four ways: parallel in and out, parallel in and out, in and out, and in and out.

In fact, there are still some circuits that Zhang Zhimu thinks should be told to everyone, such as super-forward adders, etc., Zhang Zhimu decided to talk about computer principles to everyone. The content of this course needs to be digested for a while.

However, Yang Chang also brought some good news to Zhang Zhimu, that is, they can already integrate more than a dozen transistors on a small film, but the parameters are still unstable when the carbon film resistor is deposited. This is already a good progress, which means that at least the gate or even a flip-flop can be implemented with a single chip. That's already a remarkable step forward.

Zhang Zhimu gave Yang Chang a lecture these days, and there was a good thing. Li Yunhe: They came up with a pedal power car suitable for indoor use. This kind of car has a small wheel, not a lot of power, is driven with tape, and the clutch is canceled. Ideal for women and the elderly to ride indoors. Zhang Zhimu didn't expect that Yang Yulin would not do this fresh, Huang Yukun looked at this small car very delicate and beautiful, so he had to let Zhang Zhimu teach her to learn to ride this power car. In fact, riding such a bike is easier than a bicycle, and it only took half a day for Huang Yukun to ride almost enough. Of course, Huang Yukun, the first pedal-powered car, was never handed over, and he rode it to and from work. Xiaoqing and Xiaohu are willing to sit in the back seat of Huang Yukun's car and follow Huang Yukun around the street.

The radio in the newspaper also lost no time in reporting the small power car. There is no shortage of people who have money and want to be fashionable, and many people are asking when the power car will be on the market. That Princess Anping and Xiao Hongyu even called Zhang Zhimu directly and asked for a pedal to power the car. Zhang Zhimu had no choice but to smile bitterly and said, There is no mass production now, but I promise to let Li Yunhe make a special one for you.

Li Yunhe: They really don't have time to arrange the production of this pedal power car now, because military vehicles can't be produced.

The kiln is leveling up, busy with scientific research and production. The soldiers in the north are already waiting for the day.

Anyone who can go out to be a scout in each army is definitely the best of the best in each army. This reconnaissance company sent by the First Army is a treasure in the hands of the commander. Their cavalry reconnaissance company is not the same as infantry special forces and infantry scouts, in addition to basic combat skills, they must be absolutely good riders and familiar with the situation on the steppe. Therefore, there were many Mongolian soldiers in the cavalry reconnaissance company. This time, the forward was a Mongolian squad leader with four soldiers.

A very experienced Mongolian squad leader, with the soldiers, put the horse's hooves on the grass as much as possible, so as to reduce the sound of the horse's hooves. They silently communicated with each other with gestures along the foot of Daqing Mountain, and marched eastward, never finding the situation, but the Mongolian squad leader never relaxed his vigilance. As he walked, the Mongolian squad leader suddenly raised his right hand and signaled to his comrades who were following behind, there was a situation. But after the comrades in the back came up, they looked forward with binoculars for a while, but they didn't find the situation. They motioned to the squad leader, are you okay?

The Mongolian squad leader shook his head, sniffed quietly, and motioned for everyone to sniff.

The comrades-in-arms sniffed with their noses, and one of the fighters smelled something about the situation and gave a thumbs up to the squad leader, meaning "Amazing!" ”

Although there was no target in sight, there was a fire in front of him, and although the smoke was blown away by the wind and could not be seen, the smell of smoke was smelled by the Mongolian squad leader. Someone must have made lunch. The five of them dismounted, leaving a warrior to lead the horse as a stake, and sent a warrior back along the same road to inform the team behind that there was a situation ahead. The three of them reached forward with their waists on their backs. After walking for a while, they noticed a leather tent faintly visible in a sheltered bush at the foot of the hill ahead. If you look around, you can see a few horses on a leash. They leaned over and looked around, and saw two Mongol soldiers sitting on a high boulder next to them, looking around. But they didn't see it, and not far from their feet, a few eyes were watching them. Look at the costumes, these Mongolian soldiers are the costumes of the Mongols in Mobei. Although they are all Mongolians, there are many differences in the clothing of Mongolians from place to place.

The scouts said that they were too hanging, and if the squad leader hadn't smelled the smoke in advance, they would have been discovered by the Mongolian soldiers who were on guard.

They crouched in the grass and observed for a while, and found that there were more than 20 horses in total, and although it was impossible to see how many Mongol soldiers there were, judging from the horses, there should be more than a dozen Mongol soldiers. Because the Mongol soldiers who came out to guard were generally one man and two horses.

After scouting the situation, the three of them quietly retreated. When he left, he also lifted up the overwhelmed grass.

After listening to their report, the company commander said: "It seems that our opponent is not simple!" We thought of coming out of here to scout, and they thought of it. And he sent a group of men to set up an ambush here. If a small group of scouts were to be spotted by them first, they would be able to solve the problem with a bow and arrow when they came closer. These sentinels are not ordinary people, they are all elite soldiers. Little did they know that burning a few pieces of cow dung exposed the target. ”

The instructor came and said, "I see that we will surround them first, and then we will destroy them all." Can't let one go, this terrain, we go around and it's easy for them to spot. Besides, there may be ambushes from other places. ”

The Mongolian squad leader who came back from reconnaissance said: "The location where they are hiding is easy to surround, and the problem is that the two sentries on the big rock must be eliminated first." The remaining few are easy to deal with. ”

The company commander called a platoon commander and explained the situation. The platoon leader said, "Easy to do!" Leave it to me! ”

"The key is that one can't let go, and the second is not to let them sound the alarm. We don't know if there are any other outposts nearby. The company commander said.

The platoon commander said, "Don't worry, company commander!" I personally carried a sniper rifle and led people to solve the sentry on the big rock. There are those who escape, and no matter how fast they are, they can't outrun my bullets. ”

After receiving the task, the platoon leader took ten people, all with pistols with ***, and followed the Mongolian squad leader who had just reconnoitred and sneaked back to the place where they had just reconnoitred. The Mongolian squad leader observed for a while and signaled that the situation had not changed. The platoon leader handed over the remaining people to the command of this Mongolian squad leader, and he took a good sniper rifle and two fighters to go around behind the big rock.

Using the camouflage on their bodies, they crawled from the grass to the large rock where the two sentinels were seated. But they were dumbfounded when they came behind the big rock. Behind the big stone is a steep side, nearly one zhang and five feet high. But fortunately, the Mongol sentries could not see here. There was no time to go back to get the climbing equipment, so the three of them set up a human ladder and sent the platoon commander up first, and then the platoon commander stretched out his hand to pull the soldier standing in second place up. Originally, the task of three people had to be completed by two people.

The platoon commander carried the sniper rifle on his back, took out the **** and the soldier and climbed over to the other side of the big rock. But unfortunately, caught up with a Mongolian soldier on the top of the big rock, this Mongolian soldier ran to the big stone to pee, this guy just took out the guy's business and felt that something was wrong under his feet. Not only did he feel that something was wrong, but this platoon leader felt even more wrong, and he thought that he couldn't let him pee on my head! The **** in his hand was buttoned, and with a "poof", a bullet entered the jaw of this Mongolian soldier and flew out from the top of his head. This guy fell backwards without saying a word, and the platoon leader and the soldier had already jumped up before he could fall, and the sitting Mongol soldier had not yet seen what was going on, and several bullets hit him in the head at the same time. He can be his companion with Anda.

The view on this stone was very good, and the platoon leader took off his sniper rifle and waved to the Mongolian squad leader who was in ambush and gave the order to act.

The Mongolian squad leader got up with a dozen of them, spread out and surrounded the Mongolian tent, the first to see them were two two Mongolians who were feeding the horses, they saw some colorful and green grass-like people, they felt confused for a while, although they would not know what was coming, but they knew that it must not be a good thing, just when they turned their hands and just touched the handle of the knife, they had two blood holes on their heads, and their bodies were soft and went down. Hearing a sound outside, a Mongolian soldier came out of the tent, found that someone was surrounding him, and was about to shout. The **** "poof" in the hand of the Mongolian squad leader stopped him. But when he fell, he still had one foot in the tent. The Mongol soldiers, who were eating inside the tent, knew that the situation was not good. They lunged outside, but they all collapsed at the door of the tent. Two Mongol soldiers saw that they couldn't do it, cut open the tent with their knives, and tried to get out of the tent, but when they probed, they were also killed.

At this time, the Mongolian squad leader wanted to come and shout: "Leave a living mouth!" ”

But it was too late. They counted and found that twelve people had been killed.

However, the careful Mongolian squad leader counted twenty-six horses. I don't think the number of people is right.

At this time, the soldier who followed the platoon commander behind the big rock and did not go up came back. But he dragged a Mongol soldier with him.

The platoon commander, who came down from the big stone, touched the pulse of the Mongolian soldier and said, "Still alive!" Where did you kid get a job? ”

In fact, they made a fatal mistake. That is, when they climbed towards the big rock, they did not notice that two Mongol soldiers were returning from patrol. The two Mongol soldiers watched the two men climb the big rock, they didn't dare to make a sound, but they found that there was a person left under the stone, and they wanted to catch one alive. As they crept closer, the scout was keenly aware of a sound, but he pretended not to notice. Just as the two Mongol soldiers suddenly jumped up and pounced, he pulled the trigger, killed one of them, dodged the other Mongol soldier, and turned around and punched the Mongol soldier unconscious. By the time he dragged the men over, the battle was over.

The Mongolian squad leader looked at the horses and said, "This time the number should be right." There are two horses that are specially used to carry the material of the tent, and the other horses are ridden by two per person. So that the number of people and the horses are matched. ”

When the company commander brought everyone over, he saw that the unconscious Mongolian was dressed well, and knew that he should be a petty official. He was asked to wake him up with water and asked the Mongolian squad leader to interrogate him in Mongolian. But this man didn't say anything but scolding. The company commander said, "I don't have time to accompany him!" I saw it was a bit of a sheep, we all boiled it, and then continued on our way. ”

When the Mongols arrived there, they would take some sheep with them, and the Yaogang people killed all the sheep, and after eating a good meal of mutton, they were about to set off. The company commander said: "Finally, give that guy a chance, if he says it, he can spare him from death." Otherwise, it will be dealt with. ”

Everybody said, "Come on, don't bother." ”

Sure enough, this guy just scolded and didn't say anything else. The company commander waved his hand, and a soldier went over and killed him with a knife, letting him and Anda go all the way.

After dealing with this place, the company commander said: "After a long time, the Mongols will definitely find out about the situation here." Let's go! ”

Handling the horses made it difficult for the scouts. Because with them, they do not have camouflage and easily expose the target. If they were to be released, they would probably run back to the Mongol camp on their own, which would be tantamount to telling the Mongols that something was going on here. But if they were tied up here and no one was here, the horses would probably be eaten by wolves. These are all very good war horses. Later, a warrior came up with the idea to drape the horses with some straw curtains and take them away.

This is the solution to this problem.

As they approached the pass of Gray Tengliang Mountain, they encountered another secret sentry. But since an impact ditch was found in front, they quietly went around along the impact ditch. But when they tried to get to the pass, it was difficult. Because the entire pass is blocked. It's hard to get close on horseback. And there are scouts coming out to patrol everywhere.

But when you come, you can't go back without finding out the situation. So the company commander reported the situation here to his family through the radio. It was decided that the troops would act in three directions, and let the horses be hidden in a large ditch, leaving a squad to guard the horses.

When we set off, the company commander asked everyone: "Do you remember the rules of our scouts?" ”

Everyone whispered, "Remember!" You must not be a prisoner! ”

These three routes are led by the company commander, by the instructor, and by the platoon commander. The pass could not be entered, so they took advantage of the darkness to climb over a ridge on the west side of the pass. After entering the col, they divided into three paths, left, middle and right, and without saying goodbye, they silently disappeared into the night.

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Mt. Fuji erupted, Japan was earthquaked. --Progress of "Memories of the Southern Song Dynasty".