Download 10/10/06 1) Write the RTL (Register Transfer Language) for the... 2) Is the operating system hardware or software?

10/10/06
1) Write the RTL (Register Transfer Language) for the STORE X instruction:
2) Is the operating system hardware or software?
3) If your program goes into an infinite loop, how does the operating system regain control?
4) Write a MARIE assembly language to read two numbers and determine which is smaller.
HLL:
read X
read Y
if X < Y then
min = X
else
min = Y
end if
output min
10/10/06
5. Continue the “Simple Program” example by showing the steps needed for STORE 106:
Step
RTN
PC
IR
MAR
MBR
AC
(values after ADD 105)
102
3105
105
FFE9
000C
Fetch
Decode
Get operand
Execute
6. What’s wrong with Figure 4.15? (Hint: Consider what would happen if all the registers (MAR,
PC, MBR, etc.) are connected to the bus similarly.)
7. How should the registers be connected to the bus? Draw a diagram showing PC (2) and IR (7).
D ... D D
15
1
D ... D D
0
15
PC (2)
D Q
D Q
...
D Q
(16 FFs)
IR (7)
D Q
D Q
...
D Q
(16 FFs)
P
5
P
4
P
3
Control Unit
P
2
P
1
P
0
1
0