TCSS371 – Machine Organization Assignment 5 (10 points) Due: Wednesday 11/4/2020 Chapter 4: The Von Neumann Model Plus some assembly programming Part 1 – Programming In this program you calculate n to the power of k, p = nk. This is done by repetitive multiplications; p = n*n*n*….n, repeated k times. a) Design the algorithm (assume you have a multiply function) b) Write the assembly program, repetitively calling the MULT subroutine. Run two examples; p=34, and p=210. Upload (1) your commented assembly code, and (2) screenshots of your simulator after running each example. Part 2 – Problems from chapter 4 4.1 Name the five components of the von Neumann model. For each component, state its purpose. 4.2 Briefly describe the interface between the memory and the processing unit. That is, describe the method by which the memory and the processing unit communicate. 4.3 What is misleading about the name program counter? Why is the name instruction pointer more insightful? 4.4 What is the word length of a computer? How does the word length of a computer affect what the computer is able to compute? That is, is it a valid argument, in light of what you learned in chapter l, to say that a computer with a larger word size can process more information and therefore is capable of c computing more than a computer with a smaller word size? 4.5 The following table represents a small memory. Refer to this table for the following questions. Address 0000 0001 0010 0011 0100 0101 0110 0111 Data 0001 1110 0100 0011 1111 0000 0010 0101 0110 1111 0000 0001 0000 0000 0000 0000 0000 0000 0110 0101 0000 0000 0000 0110 1111 1110 1101 0011 0000 0110 1101 1001 a) What binary value does location 3 contain? Location 6? b) The binary value within each location can be interpreted in many ways. We have seen that binary values can represent unsigned numbers, 2's complement signed numbers, floating point numbers, and so forth. 1. Interpret location 0 and location I as 2's complement integers. 2. Interpret location 4 as an ASCII value. 3. Interpret locations 6 and 7 as an IEEE floating point number. Location 6 contains number [15:0]. Location 7 contains number [31:16]. 4. Interpret location 0 and location 1 as unsigned integers. c) In the von Neumann model, the contents of a memory location can also be an instruction. If the binary pattern in location 0 were interpreted as an instruction, what instruction would it represent? d) A binary value can also be interpreted as a memory address. Say the value stored in location 5 is a memory address. To which location does it refer? What binary value does that location contain? 4.6 What are the two components of an instruction? What information do these two components contain? 4.7 Suppose a 32-bit instruction takes the following format: OPCODE SR DR IMM If there are 60 opcodes and 32 registers, what is the range of values that can be represented by the immediate (IMM)? Assume IMM is a 2's complement value. 4.8 Suppose a 32-bit instruction takes the following format: OPCODE DR SR1 SR2 UNUSED If there are 225 opcodes and 120 registers, a) What is the minimum number of bits required to represent the OPCODE? b) What is the minimum number of bits required to represent the destination register (DR)? c) What is the maximum number of UNUSED bits in the instruction encoding? 4.9 The FETCH phase of the instruction cycle does two important things. One is that it loads the instruction to be processed next into the IR. What is the other important thing? 4.11 State the phases of the instruction cycle, and briefly describe what operations occur in each phase. 4.12 For the instructions ADD, LDR, and JMP, write the operations that occur in each phase of the instruction cycle 4.14 Describe the execution of the JMP instruction if R3 contains x369C (refer to Example 4.5). 4.16 a) If a machine cycle is 2 nanosecond (ie., 2.l0-9 seconds), how many machine cycles occur each second? b) If the computer requires on the average eight cycles to process each instruction, and the computer processes instructions one at a time fiom beginning to end, how many instructions can the computer process in 1 second?
