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12,200 | SS General Hans Kammler, who as an engineer had constructed several concentration camps, including Auschwitz, had a reputation for brutality and had originated the idea of using concentration camp prisoners as slave laborers in the rocket program. Arthur Rudolph, chief engineer of the V-2 rocket factory at Peenemünde, ... | https://en.wikipedia.org/wiki?curid=33783 |
12,201 | Some prisoners claim von Braun engaged in brutal treatment or approved of it. Guy Morand, a French resistance fighter who was a prisoner in Dora, testified in 1995 that, after an apparent sabotage attempt, von Braun ordered a prisoner to be flogged, while Robert Cazabonne, another French prisoner, claimed von Braun sto... | https://en.wikipedia.org/wiki?curid=33783 |
12,202 | ... also the German scientists led by Prof. Wernher von Braun were aware of everything daily. As they went along the corridors, they saw the exhaustion of the inmates, their arduous work and their pain. Not one single time did Prof. Wernher von Braun protest against this cruelty during his frequent stays at Dora. Even ... | https://en.wikipedia.org/wiki?curid=33783 |
12,203 | Von Braun later claimed that he was aware of the treatment of prisoners, but felt helpless to change the situation. | https://en.wikipedia.org/wiki?curid=33783 |
12,204 | According to André Sellier, a French historian and survivor of the Mittelbau-Dora concentration camp, Heinrich Himmler had von Braun come to his Feldkommandostelle Hochwald HQ in East Prussia in February 1944. To increase his power-base within the Nazi regime, Himmler was conspiring to use Kammler to gain control of al... | https://en.wikipedia.org/wiki?curid=33783 |
12,205 | Von Braun had been under SD surveillance since October 1943. A secret report stated that he and his colleagues Klaus Riedel and Helmut Gröttrup were said to have expressed regret at an engineer's house one evening in early March 1944 that they were not working on a spaceship and that they felt the war was not going wel... | https://en.wikipedia.org/wiki?curid=33783 |
12,206 | The unsuspecting von Braun was detained on 14 March (or 15 March), 1944, and was taken to a Gestapo cell in Stettin (now Szczecin, Poland). where he was held for two weeks without knowing the charges against him. | https://en.wikipedia.org/wiki?curid=33783 |
12,207 | Through Major Hans Georg Klamroth, in charge of the Abwehr for Peenemünde, Dornberger obtained von Braun's conditional release and Albert Speer, Reichsminister for Munitions and War Production, persuaded Hitler to reinstate von Braun so that the V-2 program could continue or turn into a "V-4 program" (the Rheinbote as ... | https://en.wikipedia.org/wiki?curid=33783 |
12,208 | Upon investigation by the United States Federal Bureau of Investigation on 1 May 1961 advised that “there was no record of an arrest in their respective files” suggesting that Von Braun’s imprisonment was wiped from German prison records at a point after his conditional release or after the Nazi regime had fallen. | https://en.wikipedia.org/wiki?curid=33783 |
12,209 | The Soviet Army was about from Peenemünde in early 1945 when von Braun assembled his planning staff and asked them to decide how and to whom they should surrender. Unwilling to go to the Soviets, von Braun and his staff decided to try to surrender to the Americans. Kammler had ordered relocation of his team to central ... | https://en.wikipedia.org/wiki?curid=33783 |
12,210 | While on an official trip in March, von Braun suffered a complicated fracture of his left arm and shoulder in a car accident after his driver fell asleep at the wheel. His injuries were serious, but he insisted that his arm be set in a cast so he could leave the hospital. Due to this neglect of the injury he had to be ... | https://en.wikipedia.org/wiki?curid=33783 |
12,211 | In early April, as the Allied forces advanced deeper into Germany, Kammler ordered the engineering team, around 450 specialists, to be moved by train into the town of Oberammergau in the Bavarian Alps, where they were closely guarded by the SS with orders to execute the team if they were about to fall into enemy hands.... | https://en.wikipedia.org/wiki?curid=33783 |
12,212 | Nearing the end of the war, Hitler had instructed SS troops to gas all technical men concerned with rocket development. Upon hearing this, Von Braun commandeered a train, and fled with other “technical men” to a location in the mountains of South Germany. After some time, Von Braun and many of the others who made it to... | https://en.wikipedia.org/wiki?curid=33783 |
12,213 | Von Braun and several members of the engineering team, including Dornberger, made it to Austria. On 2 May 1945, upon finding an American private from the U.S. 44th Infantry Division, von Braun's brother and fellow rocket engineer, Magnus, approached the soldier on a bicycle, calling out in broken English: "My name is M... | https://en.wikipedia.org/wiki?curid=33783 |
12,214 | We knew that we had created a new means of warfare, and the question as to what nation, to what victorious nation we were willing to entrust this brainchild of ours was a moral decision more than anything else. We wanted to see the world spared another conflict such as Germany had just been through, and we felt that on... | https://en.wikipedia.org/wiki?curid=33783 |
12,215 | The American high command was well aware of how important their catch was: von Braun had been at the top of the "Black List", the code name for the list of German scientists and engineers targeted for immediate interrogation by U.S. military experts. On 9 June 1945, two days before the originally scheduled handover of ... | https://en.wikipedia.org/wiki?curid=33783 |
12,216 | Von Braun was briefly detained at the "Dustbin" interrogation center at Kransberg Castle, where the elite of Nazi Germany's economic, scientific and technological sectors were debriefed by U.S. and British intelligence officials. Initially, he was recruited to the U.S. under a program called Operation Overcast, subsequ... | https://en.wikipedia.org/wiki?curid=33783 |
12,217 | On 20 June 1945, U.S. Secretary of State Edward Stettinius Jr. approved the transfer of von Braun and his specialists to the United States as one of his last acts in office; however, this was not announced to the public until 1 October 1945. | https://en.wikipedia.org/wiki?curid=33783 |
12,218 | The first seven technicians arrived in the United States at New Castle Army Air Field, just south of Wilmington, Delaware, on 20 September 1945. They were then flown to Boston, Massachusetts, and taken by boat to the Army Intelligence Service post at Fort Strong in Boston Harbor. Later, with the exception of von Braun,... | https://en.wikipedia.org/wiki?curid=33783 |
12,219 | Finally, von Braun and his remaining Peenemünde staff (see List of German rocket scientists in the United States) were transferred to their new home at Fort Bliss, a large Army installation just north of El Paso, Texas. Von Braun later wrote that he found it hard to develop a "genuine emotional attachment" to his new s... | https://en.wikipedia.org/wiki?curid=33783 |
12,220 | While at Fort Bliss, they trained military, industrial, and university personnel in the intricacies of rockets and guided missiles. As part of the Hermes project, they helped refurbish, assemble, and launch a number of V-2s that had been shipped from Allied-occupied Germany to the White Sands Proving Ground in New Mexi... | https://en.wikipedia.org/wiki?curid=33783 |
12,221 | In 1950, at the start of the Korean War, von Braun and his team were transferred to Huntsville, Alabama, his home for the next 20 years. Between 1952 and 1956, von Braun led the Army's rocket development team at Redstone Arsenal, resulting in the Redstone rocket, which was used for the first live nuclear ballistic miss... | https://en.wikipedia.org/wiki?curid=33783 |
12,222 | As director of the Development Operations Division of the Army Ballistic Missile Agency, von Braun, with his team, then developed the Jupiter-C, a modified Redstone rocket. The Jupiter-C was the basis for the Juno I rocket that successfully launched the West's first satellite, Explorer 1, on 31 January 1958. This event... | https://en.wikipedia.org/wiki?curid=33783 |
12,223 | Repeating the pattern he had established during his earlier career in Germany, von Braun – while directing military rocket development in the real world – continued to entertain his engineer-scientist's dream of a future in which rockets would be used for space exploration. However, he was no longer at risk of being fi... | https://en.wikipedia.org/wiki?curid=33783 |
12,224 | In 1952, von Braun first published his concept of a crewed space station in a "Collier's Weekly" magazine series of articles titled "Man Will Conquer Space Soon!". These articles were illustrated by the space artist Chesley Bonestell and were influential in spreading his ideas. Frequently, von Braun worked with fellow ... | https://en.wikipedia.org/wiki?curid=33783 |
12,225 | The space station (to be constructed using rockets with recoverable and reusable ascent stages) would be a toroid structure, with a diameter of ; this built on the concept of a rotating wheel-shaped station introduced in 1929 by Herman Potočnik in his book "The Problem of Space Travel – The Rocket Motor". The space sta... | https://en.wikipedia.org/wiki?curid=33783 |
12,226 | Von Braun envisioned these expeditions as very large-scale undertakings, with a total of 50 astronauts traveling in three huge spacecraft (two for crew, one primarily for cargo), each long and in diameter and driven by a rectangular array of 30 rocket propulsion engines. Upon arrival, astronauts would establish a perma... | https://en.wikipedia.org/wiki?curid=33783 |
12,227 | At this time, von Braun also worked out preliminary concepts for a human mission to Mars that used the space station as a staging point. His initial plans, published in "The Mars Project" (1952), had envisaged a fleet of 10 spacecraft (each with a mass of 3,720 metric tonnes), three of them uncrewed and each carrying o... | https://en.wikipedia.org/wiki?curid=33783 |
12,228 | Before technically formalizing his thoughts on human spaceflight to Mars, von Braun had written a science fiction novel on the subject, set in the year 1980. However, the manuscript was rejected by no fewer than 18 publishers. Von Braun later published small portions of this opus in magazines, to illustrate selected as... | https://en.wikipedia.org/wiki?curid=33783 |
12,229 | In the hope that its involvement would bring about greater public interest in the future of the space program, von Braun also began working with Walt Disney and the Disney studios as a technical director, initially for three television films about space exploration. The initial broadcast devoted to space exploration wa... | https://en.wikipedia.org/wiki?curid=33783 |
12,230 | Later (in 1959) von Braun published a short booklet, condensed from episodes that had appeared in "This Week Magazine" before—describing his updated concept of the first crewed lunar landing. The scenario included only a single and relatively small spacecraft—a winged lander with a crew of only two experienced pilots w... | https://en.wikipedia.org/wiki?curid=33783 |
12,231 | In the first half of his life, von Braun was a nonpracticing, "perfunctory" Lutheran, whose affiliation was nominal and not taken seriously. As described by Ernst Stuhlinger and Frederick I. Ordway III: "Throughout his younger years, von Braun did not show signs of religious devotion, or even an interest in things rela... | https://en.wikipedia.org/wiki?curid=33783 |
12,232 | On the motives behind this conversion, Michael J. Neufeld is of the opinion that he turned to religion "to pacify his own conscience", whereas University of Southampton scholar Kendrick Oliver said that von Braun was presumably moved "by a desire to find a new direction for his life after the moral chaos of his service... | https://en.wikipedia.org/wiki?curid=33783 |
12,233 | At a Gideons conference in 2004, W. Albert Wilson, a former pilot and NASA employee, claimed that he had talked with von Braun about the Christian faith while von Braun was working for NASA, and believed that conversation had been instrumental in von Braun's conversion. | https://en.wikipedia.org/wiki?curid=33783 |
12,234 | Later in life, he joined an Episcopal congregation, and became increasingly religious. He publicly spoke and wrote about the complementarity of science and religion, the afterlife of the soul, and his belief in God. He stated, "Through science man strives to learn more of the mysteries of creation. Through religion he ... | https://en.wikipedia.org/wiki?curid=33783 |
12,235 | Von Braun developed and published his space station concept during the time of the Cold War when the U.S. government put the containment of the Soviet Union above everything else. The fact that his space station – if armed with missiles that could be easily adapted from those already available at this time – would give... | https://en.wikipedia.org/wiki?curid=33783 |
12,236 | The U.S. Navy had been tasked with building a rocket to lift satellites into orbit, but the resulting Vanguard rocket launch system was unreliable. In 1957, with the launch of Sputnik 1, a belief grew within the United States that it lagged behind the Soviet Union in the emerging Space Race. American authorities then c... | https://en.wikipedia.org/wiki?curid=33783 |
12,237 | NASA was established by law on 29 July 1958. One day later, the 50th Redstone rocket was successfully launched from Johnston Atoll in the south Pacific as part of Operation Hardtack I. Two years later, NASA opened the Marshall Space Flight Center at Redstone Arsenal in Huntsville, and the Army Ballistic Missile Agency ... | https://en.wikipedia.org/wiki?curid=33783 |
12,238 | Von Braun's early years at NASA included a failed "four-inch flight" during which the first uncrewed Mercury-Redstone rocket only rose a few inches before settling back onto the launch pad. The launch failure was later determined to be the result of a "power plug with one prong shorter than the other because a worker f... | https://en.wikipedia.org/wiki?curid=33783 |
12,239 | After the flight of Mercury-Redstone 2 in January 1961 experienced a string of problems, von Braun insisted on one more test before the Redstone could be deemed man-rated. His overly cautious nature brought about clashes with other people involved in the program, who argued that MR-2's technical issues were simple and ... | https://en.wikipedia.org/wiki?curid=33783 |
12,240 | The Marshall Center's first major program was the development of Saturn rockets to carry heavy payloads into and beyond Earth orbit. From this, the Apollo program for crewed Moon flights was developed. Von Braun initially pushed for a flight engineering concept that called for an Earth orbit rendezvous technique (the a... | https://en.wikipedia.org/wiki?curid=33783 |
12,241 | During the late 1960s, von Braun was instrumental in the development of the U.S. Space and Rocket Center in Huntsville. The desk from which he guided America's entry in the space race remains on display there. He also was instrumental in the launching of the experimental Applications Technology Satellite. He traveled t... | https://en.wikipedia.org/wiki?curid=33783 |
12,242 | During the local summer of 1966–67, von Braun participated in a field trip to Antarctica, organized for him and several other members of top NASA management. The goal of the field trip was to determine whether the experience gained by U.S. scientific and technological community during the exploration of Antarctic waste... | https://en.wikipedia.org/wiki?curid=33783 |
12,243 | In an internal memo dated 16 January 1969, von Braun had confirmed to his staff that he would stay on as a center director at Huntsville to head the Apollo Applications Program. He referred to this time as a moment in his life when he felt the strong need to pray, stating "I certainly prayed a lot before and during the... | https://en.wikipedia.org/wiki?curid=33783 |
12,244 | Nonetheless, on 1 March 1970, von Braun and his family relocated to Washington, DC, when he was assigned the post of NASA's Deputy Associate Administrator for Planning at NASA Headquarters. After a series of conflicts associated with the truncation of the Apollo program, and facing severe budget constraints, von Braun ... | https://en.wikipedia.org/wiki?curid=33783 |
12,245 | Von Braun also developed the idea of a Space Camp that would train children in fields of science and space technologies, as well as help their mental development much the same way sports camps aim at improving physical development. | https://en.wikipedia.org/wiki?curid=33783 |
12,246 | After leaving NASA, von Braun moved to the Washington, D.C. area and became Vice President for Engineering and Development at the aerospace company Fairchild Industries in Germantown, Montgomery County, Maryland, on 1 July 1972. | https://en.wikipedia.org/wiki?curid=33783 |
12,247 | In 1973, during a routine physical examination, von Braun was diagnosed with kidney cancer, which could not be controlled with the medical techniques available at the time. | https://en.wikipedia.org/wiki?curid=33783 |
12,248 | Von Braun helped establish and promote the National Space Institute, a precursor of the present-day National Space Society, in 1975, and became its first president and chairman. In 1976, he became scientific consultant to , the CEO of OTRAG, and a member of the Daimler-Benz board of directors. However, his deterioratin... | https://en.wikipedia.org/wiki?curid=33783 |
12,249 | Von Braun's insistence on further tests after Mercury-Redstone 2 flew higher than planned has been identified as contributing to the Soviet Union's success in launching the first human in space. The Mercury-Redstone BD flight was successful, but took up the launch slot that might have put Alan Shepard into space three ... | https://en.wikipedia.org/wiki?curid=33783 |
12,250 | Von Braun took a very conservative approach to engineering, designing with ample safety factors and redundant structure. This became a point of contention with other engineers, who struggled to keep vehicle weight down so that payload could be maximized. As noted above, his excessive caution likely led to the U.S. losi... | https://en.wikipedia.org/wiki?curid=33783 |
12,251 | Von Braun did not indicate interest in politics or political philosophy during his onboarding working for the US army. He was primarily focused on his work in guided missiles for the purpose of furthering science and technology. According to FBI background checks, “any political activity he may have engaged in was a me... | https://en.wikipedia.org/wiki?curid=33783 |
12,252 | Von Braun had a charismatic personality and was known as a ladies' man. As a student in Berlin, he would often be seen in the evenings in the company of two girlfriends at once. He later had a succession of affairs within the secretarial and computer pool at Peenemünde. | https://en.wikipedia.org/wiki?curid=33783 |
12,253 | In January 1943, von Braun became engaged to Dorothee Brill, a physical education teacher in Berlin, and he sought permission to marry from the SS Race and Settlement Main Office. However, the engagement was broken due to his mother's opposition. Later in 1943, he had an affair with a French woman while in Paris prepar... | https://en.wikipedia.org/wiki?curid=33783 |
12,254 | During his stay at Fort Bliss, von Braun proposed marriage to Maria Luise von Quistorp, his maternal first cousin, in a letter to his father. He married her in a Lutheran church in Landshut, Bavaria, on 1 March 1947, having received permission to go back to Germany and return with his bride. He was 35 and his new bride... | https://en.wikipedia.org/wiki?curid=33783 |
12,255 | In 1973, von Braun was diagnosed with kidney cancer during a routine medical examination. However, he continued to work unrestrained for a number of years. In January 1977, then very ill, he resigned from Fairchild Industries. Later in 1977, President Gerald R. Ford awarded him the country's highest science honor, the ... | https://en.wikipedia.org/wiki?curid=33783 |
12,256 | Von Braun died on 16 June 1977 of pancreatic cancer in Alexandria, Virginia, at age 65. He is buried on Valley Road at the Ivy Hill Cemetery. His gravestone cites Psalm 19:1: "The heavens declare the glory of God; and the firmament sheweth his handywork" (KJV). | https://en.wikipedia.org/wiki?curid=33783 |
12,257 | A central processing unit (CPU), also called a central processor, main processor or just processor, is the electronic circuitry that executes instructions comprising a computer program. The CPU performs basic arithmetic, logic, controlling, and input/output (I/O) operations specified by the instructions in the program.... | https://en.wikipedia.org/wiki?curid=5218 |
12,258 | The form, design, and implementation of CPUs have changed over time, but their fundamental operation remains almost unchanged. Principal components of a CPU include the arithmetic–logic unit (ALU) that performs arithmetic and logic operations, processor registers that supply operands to the ALU and store the results of... | https://en.wikipedia.org/wiki?curid=5218 |
12,259 | Most modern CPUs are implemented on integrated circuit (IC) microprocessors, with one or more CPUs on a single IC chip. Microprocessor chips with multiple CPUs are multi-core processors. The individual physical CPUs, processor cores, can also be multithreaded to create additional virtual or logical CPUs. | https://en.wikipedia.org/wiki?curid=5218 |
12,260 | An IC that contains a CPU may also contain memory, peripheral interfaces, and other components of a computer; such integrated devices are variously called microcontrollers or systems on a chip (SoC). | https://en.wikipedia.org/wiki?curid=5218 |
12,261 | Array processors or vector processors have multiple processors that operate in parallel, with no unit considered central. Virtual CPUs are an abstraction of dynamical aggregated computational resources. | https://en.wikipedia.org/wiki?curid=5218 |
12,262 | Early computers such as the ENIAC had to be physically rewired to perform different tasks, which caused these machines to be called "fixed-program computers". The "central processing unit" term has been in use since as early as 1955. Since the term "CPU" is generally defined as a device for software (computer program) ... | https://en.wikipedia.org/wiki?curid=5218 |
12,263 | The idea of a stored-program computer had been already present in the design of J. Presper Eckert and John William Mauchly's ENIAC, but was initially omitted so that it could be finished sooner. On June 30, 1945, before ENIAC was made, mathematician John von Neumann distributed the paper entitled "First Draft of a Repo... | https://en.wikipedia.org/wiki?curid=5218 |
12,264 | Early CPUs were custom designs used as part of a larger and sometimes distinctive computer. However, this method of designing custom CPUs for a particular application has largely given way to the development of multi-purpose processors produced in large quantities. This standardization began in the era of discrete tran... | https://en.wikipedia.org/wiki?curid=5218 |
12,265 | While von Neumann is most often credited with the design of the stored-program computer because of his design of EDVAC, and the design became known as the von Neumann architecture, others before him, such as Konrad Zuse, had suggested and implemented similar ideas. The so-called Harvard architecture of the Harvard Mark... | https://en.wikipedia.org/wiki?curid=5218 |
12,266 | Relays and vacuum tubes (thermionic tubes) were commonly used as switching elements; a useful computer requires thousands or tens of thousands of switching devices. The overall speed of a system is dependent on the speed of the switches. Vacuum-tube computers such as EDVAC tended to average eight hours between failures... | https://en.wikipedia.org/wiki?curid=5218 |
12,267 | The design complexity of CPUs increased as various technologies facilitated building smaller and more reliable electronic devices. The first such improvement came with the advent of the transistor. Transistorized CPUs during the 1950s and 1960s no longer had to be built out of bulky, unreliable and fragile switching el... | https://en.wikipedia.org/wiki?curid=5218 |
12,268 | In 1964, IBM introduced its IBM System/360 computer architecture that was used in a series of computers capable of running the same programs with different speed and performance. This was significant at a time when most electronic computers were incompatible with one another, even those made by the same manufacturer. T... | https://en.wikipedia.org/wiki?curid=5218 |
12,269 | Transistor-based computers had several distinct advantages over their predecessors. Aside from facilitating increased reliability and lower power consumption, transistors also allowed CPUs to operate at much higher speeds because of the short switching time of a transistor in comparison to a tube or relay. The increase... | https://en.wikipedia.org/wiki?curid=5218 |
12,270 | During this period, a method of manufacturing many interconnected transistors in a compact space was developed. The integrated circuit (IC) allowed a large number of transistors to be manufactured on a single semiconductor-based die, or "chip". At first, only very basic non-specialized digital circuits such as NOR gate... | https://en.wikipedia.org/wiki?curid=5218 |
12,271 | IBM's System/370, follow-on to the System/360, used SSI ICs rather than Solid Logic Technology discrete-transistor modules. DEC's PDP-8/I and KI10 PDP-10 also switched from the individual transistors used by the PDP-8 and PDP-10 to SSI ICs, and their extremely popular PDP-11 line was originally built with SSI ICs but w... | https://en.wikipedia.org/wiki?curid=5218 |
12,272 | Lee Boysel published influential articles, including a 1967 "manifesto", which described how to build the equivalent of a 32-bit mainframe computer from a relatively small number of large-scale integration circuits (LSI). The only way to build LSI chips, which are chips with a hundred or more gates, was to build them u... | https://en.wikipedia.org/wiki?curid=5218 |
12,273 | As the microelectronic technology advanced, an increasing number of transistors were placed on ICs, decreasing the number of individual ICs needed for a complete CPU. MSI and LSI ICs increased transistor counts to hundreds, and then thousands. By 1968, the number of ICs required to build a complete CPU had been reduced... | https://en.wikipedia.org/wiki?curid=5218 |
12,274 | Since microprocessors were first introduced they have almost completely overtaken all other central processing unit implementation methods. The first commercially available microprocessor, made in 1971, was the Intel 4004, and the first widely used microprocessor, made in 1974, was the Intel 8080. Mainframe and minicom... | https://en.wikipedia.org/wiki?curid=5218 |
12,275 | Previous generations of CPUs were implemented as discrete components and numerous small integrated circuits (ICs) on one or more circuit boards. Microprocessors, on the other hand, are CPUs manufactured on a very small number of ICs; usually just one. The overall smaller CPU size, as a result of being implemented on a ... | https://en.wikipedia.org/wiki?curid=5218 |
12,276 | While the complexity, size, construction and general form of CPUs have changed enormously since 1950, the basic design and function has not changed much at all. Almost all common CPUs today can be very accurately described as von Neumann stored-program machines. As Moore's law no longer holds, concerns have arisen abou... | https://en.wikipedia.org/wiki?curid=5218 |
12,277 | The fundamental operation of most CPUs, regardless of the physical form they take, is to execute a sequence of stored instructions that is called a program. The instructions to be executed are kept in some kind of computer memory. Nearly all CPUs follow the fetch, decode and execute steps in their operation, which are ... | https://en.wikipedia.org/wiki?curid=5218 |
12,278 | After the execution of an instruction, the entire process repeats, with the next instruction cycle normally fetching the next-in-sequence instruction because of the incremented value in the program counter. If a jump instruction was executed, the program counter will be modified to contain the address of the instructio... | https://en.wikipedia.org/wiki?curid=5218 |
12,279 | Some instructions manipulate the program counter rather than producing result data directly; such instructions are generally called "jumps" and facilitate program behavior like loops, conditional program execution (through the use of a conditional jump), and existence of functions. In some processors, some other instru... | https://en.wikipedia.org/wiki?curid=5218 |
12,280 | Fetch involves retrieving an instruction (which is represented by a number or sequence of numbers) from program memory. The instruction's location (address) in program memory is determined by the program counter (PC; called the "instruction pointer" in Intel x86 microprocessors), which stores a number that identifies t... | https://en.wikipedia.org/wiki?curid=5218 |
12,281 | The instruction that the CPU fetches from memory determines what the CPU will do. In the decode step, performed by binary decoder circuitry known as the "instruction decoder", the instruction is converted into signals that control other parts of the CPU. | https://en.wikipedia.org/wiki?curid=5218 |
12,282 | The way in which the instruction is interpreted is defined by the CPU's instruction set architecture (ISA). Often, one group of bits (that is, a "field") within the instruction, called the opcode, indicates which operation is to be performed, while the remaining fields usually provide supplemental information required ... | https://en.wikipedia.org/wiki?curid=5218 |
12,283 | In some CPU designs the instruction decoder is implemented as a hardwired, unchangeable binary decoder circuit. In others, a microprogram is used to translate instructions into sets of CPU configuration signals that are applied sequentially over multiple clock pulses. In some cases the memory that stores the microprogr... | https://en.wikipedia.org/wiki?curid=5218 |
12,284 | After the fetch and decode steps, the execute step is performed. Depending on the CPU architecture, this may consist of a single action or a sequence of actions. During each action, control signals electrically enable or disable various parts of the CPU so they can perform all or part of the desired operation. The acti... | https://en.wikipedia.org/wiki?curid=5218 |
12,285 | For example, if an addition instruction is to be executed, registers containing operands (numbers to be summed) are activated, as are the parts of the arithmetic logic unit (ALU) that perform addition. When the clock pulse occurs, the operands flow from the source registers into the ALU, and the sum appears at its outp... | https://en.wikipedia.org/wiki?curid=5218 |
12,286 | Hardwired into a CPU's circuitry is a set of basic operations it can perform, called an instruction set. Such operations may involve, for example, adding or subtracting two numbers, comparing two numbers, or jumping to a different part of a program. Each instruction is represented by a unique combination of bits, known... | https://en.wikipedia.org/wiki?curid=5218 |
12,287 | The actual mathematical operation for each instruction is performed by a combinational logic circuit within the CPU's processor known as the arithmetic–logic unit or ALU. In general, a CPU executes an instruction by fetching it from memory, using its ALU to perform an operation, and then storing the result to memory. B... | https://en.wikipedia.org/wiki?curid=5218 |
12,288 | The control unit (CU) is a component of the CPU that directs the operation of the processor. It tells the computer's memory, arithmetic and logic unit and input and output devices how to respond to the instructions that have been sent to the processor. | https://en.wikipedia.org/wiki?curid=5218 |
12,289 | It directs the operation of the other units by providing timing and control signals. Most computer resources are managed by the CU. It directs the flow of data between the CPU and the other devices. John von Neumann included the control unit as part of the von Neumann architecture. In modern computer designs, the contr... | https://en.wikipedia.org/wiki?curid=5218 |
12,290 | The arithmetic logic unit (ALU) is a digital circuit within the processor that performs integer arithmetic and bitwise logic operations. The inputs to the ALU are the data words to be operated on (called operands), status information from previous operations, and a code from the control unit indicating which operation ... | https://en.wikipedia.org/wiki?curid=5218 |
12,291 | When all input signals have settled and propagated through the ALU circuitry, the result of the performed operation appears at the ALU's outputs. The result consists of both a data word, which may be stored in a register or memory, and status information that is typically stored in a special, internal CPU register rese... | https://en.wikipedia.org/wiki?curid=5218 |
12,292 | Address generation unit (AGU), sometimes also called address computation unit (ACU), is an execution unit inside the CPU that calculates addresses used by the CPU to access main memory. By having address calculations handled by separate circuitry that operates in parallel with the rest of the CPU, the number of CPU cyc... | https://en.wikipedia.org/wiki?curid=5218 |
12,293 | While performing various operations, CPUs need to calculate memory addresses required for fetching data from the memory; for example, in-memory positions of array elements must be calculated before the CPU can fetch the data from actual memory locations. Those address-generation calculations involve different integer a... | https://en.wikipedia.org/wiki?curid=5218 |
12,294 | Capabilities of an AGU depend on a particular CPU and its architecture. Thus, some AGUs implement and expose more address-calculation operations, while some also include more advanced specialized instructions that can operate on multiple operands at a time. Some CPU architectures include multiple AGUs so more than one ... | https://en.wikipedia.org/wiki?curid=5218 |
12,295 | Many microprocessors (in smartphones and desktop, laptop, server computers) have a memory management unit, translating logical addresses into physical RAM addresses, providing memory protection and paging abilities, useful for virtual memory. Simpler processors, especially microcontrollers, usually don't include an MMU... | https://en.wikipedia.org/wiki?curid=5218 |
12,296 | A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. A cache is a smaller, faster memory, closer to a processor core, which stores copies of the data from frequently used main memory locations. Most CPUs ... | https://en.wikipedia.org/wiki?curid=5218 |
12,297 | All modern (fast) CPUs (with few specialized exceptions) have multiple levels of CPU caches. The first CPUs that used a cache had only one level of cache; unlike later level 1 caches, it was not split into L1d (for data) and L1i (for instructions). Almost all current CPUs with caches have a split L1 cache. They also ha... | https://en.wikipedia.org/wiki?curid=5218 |
12,298 | Other types of caches exist (that are not counted towards the "cache size" of the most important caches mentioned above), such as the translation lookaside buffer (TLB) that is part of the memory management unit (MMU) that most CPUs have. | https://en.wikipedia.org/wiki?curid=5218 |
12,299 | Caches are generally sized in powers of two: 2, 8, 16 etc. KiB or MiB (for larger non-L1) sizes, although the IBM z13 has a 96 KiB L1 instruction cache. | https://en.wikipedia.org/wiki?curid=5218 |
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