题目内容
（请给出正确答案）
A.physical model
B.mathematical model
C.description model
D.language model
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更多“In system simulation, the system models include .”相关的问题
A、Functional simulation
B、Behavioral level simulation
C、System level simulation
D、Timing simulation
A．design entry
B．logic simulation
C．timing verification
D．Logic synthesis
阅读下面的MIPS汇编程序，回答问题。 ________________________________________________________________________ .data array: .word 1,1,1 tmp: .word 0 : 25 .text .globl main main: la $t0, array li $t1, 25 loop: lw $t3, 0($t0) lw $t4, 4($t0) lw $t5, 8($t0) add $t2, $t3, $t4 add $t2, $t2, $t5 sw $t2, 12($t0) addi $t0, $t0, 4 addi $t1, $t1, -1 bgtz $t1, loop li $v0, 10 # system call for exit syscall _____________________________________________________________________________ 请在你的作业中回答以下七道题： 请说明程序实现的功能。(5分)（提示：可以利用“Math”编辑输入数学公式，建议提交之前用Previe查看输入效果） 分析程序的访存行为，仅考虑数据访存。（5分）（提示：访存行为包括程序一共发生了多少次访存操作，每次访存操作的地址之间有什么样的关系等） 根据MARS内置的Data Cache Simulation Tool，构建一个容量为8字节的cache，要求块大小为4字节（one word），替换策略为LRU，组策略为直接映射。运行上述MIPS程序，得到cache命中率为多少？（5分） 结合程序的访存行为，详细分析问题3中cache miss的原因。（10分） 根据MARS内置的Data Cache Simulation Tool，构建一个容量为8字节的cache，要求块大小为4字节（one word），替换策略为LRU，组策略为全相联。运行上述MIPS程序，得到cache命中率为多少？（5分） 结合程序的访存行为，详细分析问题5中cache miss的原因。（10分） 1) 保持其他参数不变，通过增加block数量的方式将cache的容量扩大为16个字节，评测不同组策略下cache命中率的变化，并分析原因？2) 进一步扩大cache容量，cache命中率会如何变化？（10分）
A、Run Behavioral Simulation
B、Run Post-Synthesis Functional Simulation
C、Run Post-Synthesis Timing Simulation
D、Run Post-lmplementation Functional Simulation
【填空题】Lesson 15 Listening Comprehension-1 Fill in the Blanks with what you have heard On TCAS As the direct result of accidents in 1980s leads to the wide-spread introduction to an (1) clever piece of new technology. It is called TCAS—traffic collision avoidance system. TCAS relies on a clever piece of technology called transponder--a device both (2) to radio signal. When 2 aircraft approach each other their transponders lock on and start to talk to each other. Terry is to train the pilots to use TCAS. The transponders of the aircraft (3) each other many times a second, In doing so it creates a (4) radio bubbles around each aircraft. if any time it senses those 2 bubbles might come too close for comfort, TCAS will (5) to pilots must react. And the approaching plane show up as a (6) , you can see we have got traffic below . it is climbing indicated by the arrow. It is now 600 feet below. Radio bubble is too close for comfort, the white diamond will change into an (7) . TCAS flashes up warning “ traffic, traffic” that is now (8) , 500feet below and still climbing. If the situation gets serious, the orange circle becomes (9) . TCAS orders the plane to (10) “ clime , climb” Now it is (11) . So i need to (12) the aircraft to avoid the traffic. In the simulation, TCAS orders one plane to climb and the other to descend. TCAS steers the aircraft away from each other. “ clear of traffic” and re-engaging the autopilot, and two bubbles in which the aircraft is sitting moves to safe distance apart. Technology seems to finally (13) that pilots are not able to see each other. As a direct result of LA collision, TCAS is now (14) on all commercial aircraft flying to most destinations. But TCAS system designed to (15) would one day play a part in one of the worst collisions of modern times.
Japanese Computer Is World's Fastest, as U.S. Falls Back
The world's fastest computer
A Japanese laboratory has built the world's fastest computer, a machine so powerful that it matches the raw processing power of the 20 fastest American computers combined and far outstrips the previous leader, an 1. B. M. -built machine.
The achievement, which was reported today by an American scientist who tracks the performance of the world's most powerful computers, is evidence that a technology race that most American engineers thought they were winning handily is far from over. American companies have built the fastest computers for most of the last decade. The accomplishment is also a vivid statement of contrasting scientific and technology priorities in the United States and Japan. The Japanese machine was built to analyze climate change, including global warming, as well as weather and earthquake patterns. By contrast, the United States has predominantly focused its efforts on building powerful computers for simulating weapons, while its efforts have lagged in scientific areas like climate modeling.
A competition between Japan and U. S.
For some American computer scientists, the arrival of the Japanese supercomputer evokes the type of alarm raised by the Soviet Union's Sputnik(人造地求卫星)satellite in 1957.
Several United States computer scientists said the Japanese machine reflected differences in style. and commitment that suggest that United States research and spending efforts have grown complacent (自满的)in recent years. For now, the new computer will be used only for climate research, and American scientists have already begun preparing to move some of their climate simulation research to run on the Japanese machine.
"The Japanese clearly have a level of will that we haven't achieved," said Thomas Sterling, a computer designer at the California Institute of Technology. "These guys are blowing us out of the water, and we need to sit up and take notice."
Wide applications of the magic power
The new Japanese supercomputer will have both scientific and practical applications. It will be used for advanced modeling of theories about global warming and climate change, and it will be able to predict short-term weather patterns.
Advances in computer speed today routinely extend computer simulation into all areas of science and engineering as complex calculations take an increasingly shorter time. Because increases in computing power tend to have exponential (指数的)results, a problem that could take years for even the fastest computers today might be finished in hours on the new Japanese computer.
The ability to track the path of a typhoon, for example, is of immediate relevance to the island nation of Japan. Improved prediction made possible by a more powerful computer might save lives and property.
Computer simulation has become a standard tool in both science and modern design of products ranging from drugs to bicycles. Computers that are more powerful make possible simulations that are more accurate and can reduce cost and increase efficiency. At one time, for example, computers were capable of computing the flow of air over a single airplane wing but can now cover the entire aircraft.
The new Japanese supercomputer was financed by the Japanese government and has been installed at the Earth Simulator Research and Development Center in Yokohama (横滨), west of Tokyo. The Japanese government spent $ 350 million to $ 400 million developing the system over the last five years, according to Dr. Akira Sekino, president and chief executive of HNSX Supercomputers, a unit of the NEC Corporation based in Littleton, Colo.
The new computer was formally dedicated last month, and the Japan Marine Science and Technology Center said yesterday that the mac
A．Y
B．N
C．NG
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