Computer Architecture :

18. Sometimes it is useful for an 8-bit ALU such as Fig. 3-19 to generate the constant 1 as output. Give two different ways this can be done. For each way, specify the values of the six control signals:

FIG 3-19

12. Write microcode for the Mic-1 to implement the JVM POPTWO instruction. This instruction removes two words from the top of the stack

17. Implement the JVM DLOAD instruction for the Mic-2. It has a 1-byte index and pushes the local variable at this position onto the stack. Then it pushes the next higher word onto the stack as well.

Figure 3-18. A 1-bit ALU 1-bit ALU 1-bit ALU 1-bit ALU 1-bit ALU 1-bit ALU INC 1-bit ALU 1-bit ALU 1-bit ALU 0 O7 Carry Carry in out Figure 3-19. Eight 1-bit ALU slices connected to make an 8-bit ALU. The en- ables and invert signals are not shown for simplicity