Bitwise Operator
Specified bitwise operation on inputs
Libraries:
Simulink /
Logic and Bit Operations
HDL Coder /
Logic and Bit Operations
Description
The Bitwise Operator block performs the bitwise operation that you specify on one or more operands. Unlike logic operations of the Logical Operator block, bitwise operations treat the operands as a vector of bits rather than a single value.
Restrictions on Block Operations
The Bitwise Operator block does not support shift operations. For shift operations, use the Shift Arithmetic block.
When configured as a multiinput XOR gate, this block performs modulo2 addition according to the IEEE^{®} Standard for Logic Elements.
Examples
Unsigned Inputs for the Bitwise Operator Block
The following model shows how the Bitwise Operator block works for unsigned inputs.
Each Constant block outputs an 8bit unsigned integer (uint8). To determine the binary value of each Constant block output, use the dec2bin function. The results for all logic operations appear in the next table.
Signed Inputs for the Bitwise Operator Block
This example shows how the Bitwise Operator block works for signed inputs.
Each Constant block produces an 8bit signed integer (int8
). To determine the binary value of each Constant block output, use the dec2bin
function. The table shows the results for all logic operations.
Ports
Input
Port_1 — Input signal
scalar  vector
Input signal, specified as a scalar or vector.
The NOT operator accepts only one input, which can be a scalar or a vector. If the input is a vector, the output is a vector of the same size containing the bitwise logical complements of the input vector elements.
For a single vector input, the block applies the operation (except the NOT operator) to all elements of the vector.
For two or more inputs, the block performs the operation between all of the inputs. If the inputs are vectors, the block performs the operation between corresponding elements of the vectors to produce a vector output.
Data Types: int8
 int16
 int32
 int64
 uint8
 uint16
 uint32
 uint64
 Boolean
 fixed point
Output
Port_1 — Output signal
scalar  vector
The output signal specified as the output data type, which the block inherits from the driving block, must represent zero exactly. Data types that satisfy this condition include signed and unsigned integer data types.
The size of the block output depends on the number of inputs, the vector size, and the operator you select. If you do not specify a bit mask, the output is a scalar. If you do specify a bit mask, the output is a vector.
Data Types: int8
 int16
 int32
 int64
 uint8
 uint16
 uint32
 uint64
 Boolean
 fixed point
Parameters
Operator — Bitwise logical operator
AND (default)  OR  NOR  NAND  XOR  NOT
Specify the bitwise logical operator for the block operands.
You can select one of these bitwise operations:
Bitwise Operation  Description 

AND  TRUE if the corresponding bits are all TRUE 
OR  TRUE if at least one of the corresponding bits is TRUE 
NAND  TRUE if at least one of the corresponding bits is FALSE 
NOR  TRUE if no corresponding bits are TRUE 
XOR  TRUE if an odd number of corresponding bits are TRUE 
NOT  TRUE if the input is FALSE (available only for single input) 
Programmatic Use
Block Parameter:
logicop 
Type: character vector 
Values:
'AND' 'OR'
'NAND' 'NOR'
'XOR' 
'NOT' 
Default:
'AND' 
Use bit mask — Select to use bit mask
checked (default)  unchecked
Select to use the bit mask. Clearing this check box enables Number of input ports and disables Bit Mask and Treat mask as.
Programmatic Use
Block Parameter:
UseBitMask 
Type: character vector 
Values:
'off' 'on' 
Default:
'on' 
Number of input ports — Number of input signals
1 (default)  integer
Specify the number of inputs. You can have more than one input ports.
Dependency
Clearing the Use bit mask check box enables Number of input ports and disables Bit Mask and Treat mask as.
Programmatic Use
Block Parameter:
NumInputPorts 
Type: character vector 
Values: positive integer 
Default:
'1' 
Bit Mask — Bit mask to associate with a single input
bin2dec (default)
Specify the bit mask to associate with a single input. This parameter reads values as hexadecimal values.
You can use the bit mask to set, get, or clear a bit on the input.
To perform a...  Set the Operator parameter to...  And create a bit mask with... 

Bit set  OR  A 1 for each corresponding input bit that you want to set to 1 
Bit clear  AND  A 0 for each corresponding input bit that you want to set to 0 
Bit get  AND  A 1 for each corresponding input bit that you want to get 
Suppose you want to set the fourth bit of an 8bit input vector. The bit
mask would be 00010000, which you can specify as 2^4
for
the Bit Mask parameter. To clear the bit, the bit mask
would be 11101111, which you can specify as
2^7+2^6+2^5+2^3+2^2+2^1+2^0
for the Bit
Mask parameter.
Tip
Do not use a mask greater than 53 bits. Otherwise, an error message appears during simulation.
Dependency
This parameter is available only when you select Use bit mask.
Programmatic Use
Block Parameter:
BitMask 
Type: character vector 
Values: positive integer 
Default:
'bin2dec('11011001')' 
Treat mask as — Treat the mask as a realworld value or a stored integer
Stored Integer
(default)  Real World Value
Specify whether to treat the mask as a realworld value or a stored integer.
The encoding scheme is V
= SQ
+ B
, as described in Scaling (FixedPoint Designer) in the FixedPoint Designer™ documentation. Real World Value
treats the mask as V
. Stored
Integer
treats the mask as
Q
.
Dependency
This parameter is available only when you select Use bit mask.
Programmatic Use
Block Parameter:
BitMaskRealWorld 
Type: character vector 
Values: 'Real World
Value'  'Stored Integer' 
Default: 'Stored
Integer' 
Block Characteristics
Data Types 

Direct Feedthrough 

Multidimensional Signals 

VariableSize Signals 

ZeroCrossing Detection 

^{a} Bit operations are not recommended for use with Boolean signals. 
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
HDL Code Generation
Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.
HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.
This block has one default HDL architecture.
ConstrainedOutputPipeline  Number of registers to place at
the outputs by moving existing delays within your design. Distributed
pipelining does not redistribute these registers. The default is

InputPipeline  Number of input pipeline stages
to insert in the generated code. Distributed pipelining and constrained
output pipelining can move these registers. The default is

OutputPipeline  Number of output pipeline stages
to insert in the generated code. Distributed pipelining and constrained
output pipelining can move these registers. The default is

PLC Code Generation
Generate Structured Text code using Simulink® PLC Coder™.
FixedPoint Conversion
Design and simulate fixedpoint systems using FixedPoint Designer™.
Version History
Introduced before R2006a
See Also
Logical Operator  Compare To Constant  Compare To Zero  Shift Arithmetic
Topics
 WWV Digital Receiver  Synchronization and Detection (DSP System Toolbox)
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