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A DMA module is transferring characters to main memory from an external device transmitting at 500,000 bits per second (bps). The processor can fetch instructions at the rate of 1 million instructions per second where each instruction is 64 bits wide. Assume the bus used to access main memory is 64 bits wide and that the DMA module has priority over the CPU for memory access. In other words, when the DMA module wants to access memory, the CPU must pause for a cycle until the DMA module is done. a) How many bus cycles per second will be used by the DMA module? b) By how much (percentage) will the processor be slowed down due to the DMA activity? c) In a system without DMA, an interrupt would be generated each time 64 bits of data were available for transfer from the external device. For each interrupt, the processor would need to fetch a 100-instruction interrupt handler routine from memory, then transfer the data from the external device into a register, and finally store the data into main memory. How many bus cycles per second are used to handle the data stream now? d) By how much will the processor be slowed down?
Investigate the Object Management Group (OMG). Discuss your findings. Describe what it is, its purpose, and its influence on UML and the object approach to systems development.
Interesting emerging market is using Internet phone and company's high speed LAN to replace same company's PBX. Write a one page report on this issue.
Write an instruction sheet for the user so that she can make the modi cations to her home machine so that she can access the le on the ash drive containing the encrypted le system.
Did you find the Microsoft Project tool easy to use? What is your best feature of the tool
Assuming that the initial values of the cache tags and the cache lines are completely arbitrary, Also, show how the cache tags will change for each of the above steps. You should justify your answer.
To locate nearest numbered cross street for a given avenue address, the following algorithm can be used: cancel last diget of the address, divide by two,
A decision maker observes a discrete-time system which moves between states {s1,s2,s3,s4} according to the following transition probability matrix?
Given two strings of size m, n and set of operations replace (R), insert (I) and delete (D) all at equal cost. Find minimum number of edits (operations) required to convert one string into another.
Describe operational, tactical and strategic reporting. How do requirements drive reporting system inputs requirements and write down the ramifications of ignoring user requirements.
Write a general set of instructions that will allow us to change any displayed value (from 0 to 9) to any desired value (from 0 to 9) in the least number of steps. For example, if the displayed value is 1 and the desired value is 0,
You have been asked to present a presentation to law school class on digital crime. After presentation, a student asks why so few people are really prosecuted for computer crime.
Which of the following is a benefit of using a central authentication server?
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