My presentation on Computer Architecture topic Shift micro operations assigned by Prof: Sir Mohmaad Raza Baloch Shb

1. Shift Micro operations
Assigned By: Prof Sir Mohammand Raza
Baloch Shb
Delivered by : Pir Sarfraz

2. Topic To be Discuss..
 Micro Operations
 Types Of Micro Operations
 Shit Micro Operations
 Logical shift micro operation.
 Circular shift micro operation
 Arithmetic Shift micro operation
 Register Transfer language
 References

3. Micro Operations
 The operations executed on data storage
in registers are called micro operations.
 A Micro operation is an elementary
operation performed with the data stored
in registers.
Micro operations Example:
Shift , count clear and load

4. Types of micro
operations
 Arithmetic micro operations
 Logic micro operations
 Shift micro operations

5. Shift micro operations
 Shift micro operations are used for
serial
transfer of data.
 This operations shift contents of
register in left of right direction.
 At the same time when the bits are
shifted the last or flip-flop receives
binary information from serial inputs.

6. Example :
The bits are shifted to words left by one bit position
The bits are shifted to words right by one bit position

7. Types Shift micro
operations
 Logical shift micro operation.
 Circular shift micro operation
 Arithmetic Shift micro operation

8. Shift Micro operations
Symbolic designation Description
R ← shl R Shift-left register R
R ← shr R Shift-right register R
R ← cil R Circular shift-left register R
R ← cir R Circular shift-right register R
R ← ashl R Arithmetic shift-left R
R ← ashr R Arithmetic shift-right R
TABLE 4-7. Shift Micro operations

9. Register transfer
language
Use symbols, rather than words, to
specify the sequence of micro
operations
• The symbolic notation used is called
a register transfer language
• A programming language is a
procedure for writing symbols to
specify a given computational
process
• Define symbols for various types of
micro operations and describe
associated hardware that can
implement the micro operations

10. Register transfer
language

11. Logical shift micro operation
A logical shift transfer 0 through the serial
input. OR
The standard logical shifts shift all bits one
bit position to the left or right and place a 0
in the leftmost or rightmost position,
respectively.
It can be defined in RTL by:
R←shl R shift-left register R
R←shr R shift-right register R

12. Circular shift micro
The circuolapr sehriaft tiito isn also known as Rotate
micro operation. It circulates the bit around
both ends without any loss of information.
It operate the same as a logical shifts
except that instead of shifting a 0 into the
end bit, the leftmost bit is shifted into the
rightmost bit position on a CIL, and the
rightmost bit is shifted into the leftmost bit
position on a CIR.
It can be defined in RTL by:
R←cil R circular shift-left register R
R←cir R circular shift-right register R

13. Circular shift micro
operation
EXAMPLE

14. Arithmetic Shift micro
operation
The arithmetic shift shifts a signed binary number
to the left or right
• To the left is multiplying by 2, to the right is
dividing
by 2
• Arithmetic shifts must leave the sign bit
unchanged
• Because the sign of the number remain same
when it multiplied or divided by 2.
•The left bit hold the sign bit and others hold
number
•The sign bit 0 for positive and 1 for negative
•Negative numbers are in 2’ complement form.
It can be defined in RTL by:
R←ashl R arithmetic shift-left register R
R←ashr R arithmetic shift-right register R

15. Example :

16. References
 Computer Architecture Notes
 Slide Share
 Wikipedia
 Rockpedia
 Zeepedia

17. Thanks