Shift micro operations & 4 bit combinational circuit shifter

basic shift micro operations
and 4 bit combinational circuit shifter
hardware implementation

1. Prepared by:
Chauhan Monika 160040107007

2. What is SHIFT MICRO OPERATION?
How SHIFT MICRO OPERATION works?
Types of SHIFT MICRO OPERATION
Examples
Hardware implementation

3. Shift Micro Operations are used for serial
transfer of data
They are also used in conjunction with
arithmetic, logic and other data-processing
operations

4. The contents of register can be shifted to
the left or right
At the same time that the bits are shifted,
the first flip-flop receives its binary
information from the serial input
Shift left operation - serial input transfers a
bit into the rightmost operation
Shift right operation - serial input transfers a
bit into the leftmost operation

5. The information transferred through the
serial input determines the type of shift
3 types of shifts:
1. Logical shift: Transfers 0 through the
serial input
2. Circular shift: Circulates the bits of the
register around the two ends without loss
of information
3. Arithmetic shift: Shifts a signed binary
number to the left or right

6. A = 10101010
Logical sift left (shl):
1 0101010
ANS: 0101010 0
Logical sift right (shr):
1010101 0
ANS: 0 1010101
1. Logical shift:

7. 2. Circular shift
A = 10101010
Circular sift left (cil):
1 0101010
ANS: 0101010 1
Circular sift right (cir):
1010101 0
ANS: 0 1010101

8. 3. Arithmetic shift:
A = 10101010
(underlined 1 suggests signed binary number )
Leave the signed bit unchanged because the
sign of the number remains the as it is when it is
multiplied or divided by 2
Arithmetic shift left (ashl):
Multiplies binary number by 2
A= 42 (decimal)
A= 42 * 2 = 84

ANS: 11010100 (84 in binary)

9. A = 10101010
Arithmetic shift right (ashr):
Divides signed binary number by 2
A= 42 (decimal)
A= 42 / 2 = 21

ANS: 10010101 (21 in binary)

11. It can be constructed with multiplexers
4 data inputs A0 through A3
4 data outputs H0 through H3
2 serial inputs: IL for shift left
IR for shift right
When S=0 the input data are shifted right
When S=1 the input data are shifted left

12. THANK YOU