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