Specify the 16-bit contro l word that must be applied to the datapath of Figure

Question

Specify the 16-bit contro

l word that must be applied to the datapath of Figure 8-11 to implement each of the following microoperations:

a) R3 <-- Data in

b) R4 <-- 0

c) R1 <-- sr R4

d) R3 <-- R3 + 1

e) R2 <-- sl R2

f) R1 <-- R2 R4

g) R7 <-- R1 + R3

h) R4 <-- R5 - Constant in

RW 0 Write D data 15 DA 14 D address 8×n Register file 12 A address B address-8 BA 10 A data B data Constant in MB 6 MUX B Bus A Address out Bus B Data out Function unit Data in MUX D Bus D (a) Block diagram 15 14 13 12 11 10 9 8 76 5 4 3 2 1 0 BA M (b) Control word MIR FIGURE 8-11 Datapath with Control Variables

Explanation / Answer

a ) Data tansfer in R3

B ) o in r4

c) Arithmetic shift right

d) Increment

e ) Arithmetic shift left

f) R1 <-- R2 R4

g) Add

h) Decrement

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