Example of Program ExecutionFetch StageOpcode01SMemory300 1940301 59 41302 2941940 0 0 03941 0 0 0 2Step 1Memory300 1940301 5 941302 2941940 0 0 0 3941 0 0 0 2Step 3Memory300 1940301 5941302 2941940 000 3941 0 0 0 2Step 5CPU Registers300 PC34AC940 IRCPU Registers301 PC0003 AC5941 IRCPU Registers302 PC0005 AC2941 IRMemory300 1940301 5 9 41302 294940 0 0 03941 0 0 0 2Step 2Memory300 1940301 59 41302 2 9 4Execute Stage940 0 0 0 3941 0 0 02Step 40001= Load AC from memory0010 Store AC to memory0101 Add to AC from memoryMemory300 1940301 594 1302 2 9 41940 0 0 03941 0 0 05Step 6(a) Instruction formatFigure 1.4 Example of Program Execution(contents of memory and registers in hexadecimal)Magnitude(b) Integer formatAddressProgram counter (PC) = Address of instructionInstruction register (IR)= Instruction being executedAccumulator (AC)= Temporary storage(c) Internal CPU registersFigure 1.3 Characteristics of a Hypothetical Machine(d) Partial list of opcodesCPU Registers301 PC0003 AC940 IRCPU Registers302 PC0005 AC5941 RCPU Registers303 PC0005 AC2941 IR1515 Problem 1.1:Suppose the hypothetical processor of Figure 1.3 also has two I/O instructions:0011= Load AC from I/O0111 = Store AC to I/OIn these cases, the 12-bit address identifies a particular external device. show the pro-gram execution (using format of Figure 1.4) for the following program:1. Load AC from device 5.2. Add contents of memory location 940.3. Store AC to device 6.Assume that the next value retrieved from device 5 is 3 and that location 940 containsa value of 2.Problem 1.7:In virtually all systems that include DMA modules, DMA access to main memory isgiven higher priority than processor access to main memory. Why?

Name: Example of Program ExecutionFetch StageOpcode01SMemory300 1940301 59
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Description: Example of Program ExecutionFetch StageOpcode01SMemory300 1940301 59 41302 2941940 0 0 03941 0 0 0 2Step 1Memory300 1940301 5 941302 2941940 0 0 0 3941 0 0 0 2Step 3Memory300 1940301 5941302 2941940 000 3941 0 0 0 2Step 5CPU Registers300 PC34AC940 I

DMA stands for DIRECT MEMORY ACCESS In most cases, it is observable that when DMA and CPU…

Answered: a value of 2. Problem 1.7: In virtually…

Engineering

Computer Science

a value of 2. Problem 1.7: In virtually all systems that include DMA modules, DMA access to main memory is given higher priority than processor access to main memory. Why?

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter11: Operating Systems

Section: Chapter Questions

Problem 23VE

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