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Boolean Functions (FPGA Module)

LabVIEW FPGA Module 8.2 Help
August 2006

NI Part Number:
371599B-01

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Use the Boolean functions to perform logical operations on single Boolean values or arrays of Boolean values.

When you use the Boolean to Array function in an FPGA VI, the function converts fixed-size arrays to use the smallest unsigned representation that will fit the array size. When you use the Boolean to Array function in a Windows VI, the function converts a Boolean array to a 32-bit unsigned integer.

Note  This palette is specific to FPGA targets and contains a subset of the VIs and functions that are on this palette when you edit a Windows or RT target VI.

Palette ObjectDescription
And Array ElementsReturns TRUE if all the elements in Boolean array are TRUE. This function also returns TRUE if Boolean array is empty because TRUE is the identity for the Boolean AND operation. Otherwise, the function returns FALSE. This function accepts an array of any size but returns only a single value based on all values in Boolean array.
AndComputes the logical AND of the inputs. Both inputs must be Boolean or numeric values. If both inputs are TRUE, the function returns TRUE. Otherwise, it returns FALSE.
Boolean Array To NumberConverts a Boolean array to a 32-bit unsigned integer by interpreting the array as the two's complement of the binary representation of an integer, with the first element of the array being the least significant bit.
Boolean To (0,1)Converts a Boolean FALSE or TRUE value to a 16-bit integer with a value of 0 or 1, respectively.
Compound ArithmeticPerforms arithmetic on one or more numeric, array, cluster, or Boolean inputs. Select the operation (Add, Multiply, AND, OR, or XOR) by right-clicking the function and selecting Change Mode from the shortcut menu. The default mode depends on the palette from which you drop this function.
Exclusive OrComputes the logical exclusive or (XOR) of the inputs. Both inputs must be Boolean or numeric values. If both inputs are TRUE or both inputs are FALSE, the function returns FALSE. Otherwise, it returns TRUE.
False ConstantUse this constant to provide a value of FALSE to the block diagram.
ImpliesNegates x and then computes the logical OR of y and the negated x. Both inputs must be Boolean or numeric values. If x is TRUE and y is FALSE, the function returns FALSE. Otherwise, it returns TRUE.
Not AndComputes the logical NAND of the inputs. Both inputs must be Boolean or numeric values. If both inputs are TRUE, the function returns FALSE. Otherwise, it returns TRUE.
Not Exclusive OrComputes the logical negation of the logical exclusive or (XOR) of the inputs. Both inputs must be Boolean or numeric values. If both inputs are TRUE or both inputs are FALSE, the function returns TRUE. Otherwise, it returns FALSE.
Not OrComputes the logical NOR of the inputs. Both inputs must be Boolean or numeric values. If both inputs are FALSE, the function returns TRUE. Otherwise, it returns FALSE.
NotComputes the logical negation of the input. If x is FALSE, the function returns TRUE. If x is TRUE, the function returns FALSE.
Number To Boolean ArrayConverts an integer to a Boolean array of 8, 16, or 32 elements, depending on the number of bits in the integer. The 0th element of the array corresponds to the least significant bit of the two's complement of the binary representation of the integer.
Or Array ElementsReturns FALSE if all the elements in Boolean array are FALSE or if Boolean array is empty. Otherwise, the function returns TRUE. This function accepts an array of any size but returns only a single value based on all values in Boolean array.
OrComputes the logical OR of the inputs. Both inputs must be Boolean or numeric values. If both inputs are FALSE, the function returns FALSE. Otherwise, it returns TRUE.
True ConstantUse this constant to provide a value of TRUE to the block diagram.


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