1. MARIE: An Introduction to a Simple Computer
Chapter 4
MARIE: An Introduction to a Simple Computer
Linda Null, Julia Lobur

2. Figure 04.UN01: "When you wish to produce a result by means of an instrument, do not allow yourself to complicate it."
Leonardo da Vinci

3. Figure 04.F01: a) Point-to-Point Buses b) Multipoint Buses

4. Figure 04.F02: The Components of a Typical Bus-

5. Figure 04.F03: Backplane Bus-

6. Figure 04.F04: a) N 8-Bit Memory Locations b) M 16-Bit Memory Locations

7. Table 04.T01: Calculating the Address Bits Required-

8. Figure 04.F05: Memory as a Collection of RAM Chips-

9. Figure 04.F06A: High-Order Memory Interleaving

10. Figure 04.F06B: Address Structure-

11. Figure 04.F06C: First Two Modules-

12. Figure 04.F07A: Low-Order Memory Interleaving

13. Figure 04.F07B: Address Structure-

14. Figure 04.F07C: First Two Modules-

15. Figure 04.F08: MARIE's Architecture-

16. Figure 04.F09: Datapath in MARIE-

17. Figure 04.F10: MARIE's Instruction Format-

18. Table 04.T02: MARIE's Instruction Set-

19. Figure 04.F11: The Fetch-Decode-Execute Cycle

20. Figure 04.F12: Fetch-Decode-Execute Cycle with Interrupt Checking

21. Figure 04.F13: Processing an Interrupt-

22. Table 04.T03: A Program to Add Two Numbers-

23. Figure 04.F14: A Trace of the Program to Add Two Numbers-

24. Table 04.T04: An Example Using Labels-

25. Table 04.T05: An Example Using Directives for Constants-

26. Table 04.T06: MARIE's Extended Instruction Set-

27. Table 04.T07: MARIE's Full Instruction Set-

28. Figure 04.F15: Connection of MARIE's MBR to the Datapath-

29. Table 04.T08: ALU Control Signals and Response-

30. Figure 04.F16: Timing Diagram for the Microoperations of MARIE's Add Instruction-

31. Figure 04.F17: Hardwired Control Unit-

32. Figure 04.F18: Partial Instruction Decoder for MARIE's Instruction Set-

33. Figure 04.F19: Ring Counter Using D Flip-Flops

34. Figure 04.F20: Combinational Logic for Signal Controls of MARIE's Add Instruction-

35. Figure 04.F21: Microprogrammed Control Unit-

36. Figure 04.F22: MARIE's Microinstruction Format-

37. Table 04.T09: Microoperation Codes and Corresponding MARIE RTL-

38. Figure 04.F23: Selected Statements in MARIE's Microprogram-

39. Figure 04.F24: EAX Register, Broken into Parts-

40. Table 04.T10: MIPS32 Register Naming Convention-