High Throughput Subtract (Clock-Driven Logic)

Computes the difference between two values.

To enable handshaking, select the Four wire checkbox in the Item tab.

x

Minuend.

This input accepts a fixed-point number or a 1D array of fixed-point numbers.

y

Subtrahend.

This input accepts a fixed-point number or a 1D array of fixed-point numbers.

input valid

Boolean value that specifies whether the next data point is valid and can be processed.

Wire output valid of an upstream node to this input to transfer data from the upstream node to this node.

This input is available only when you select the Four wire checkbox in the Item tab.

 True The data point is valid and can be processed. False The data point is not valid.

Boolean value that specifies whether downstream nodes are ready for this node to return a new value.

Use Feedback Node to wire ready for input of a downstream node to this input of the current node. If this input is False during a given cycle, output valid returns False during that cycle.

This input is available only when you select the Four wire checkbox in the Item tab.

 True The downstream node is ready for the next data point. False The downstream node is not ready for the next data point.

Default: True

operation overflow

Boolean value that indicates whether the theoretical computed value exceeds the valid range of the output data type.

 True The theoretical computed value exceeds the valid range of the output data type. False The theoretical computed value is within the valid range of the output data type.

This output can return a Boolean or a 1D array of Booleans.

x-y

Difference between x and y.

This output can return a fixed-point number or a 1D array of fixed-point numbers.

output valid

Boolean value that indicates whether this node has computed a result that downstream nodes can use.

Wire this output to input valid of a downstream node to transfer data from the node to the downstream node.

This output is available only when you select the Four wire checkbox in the Item tab.

 True The node has computed a result that downstream nodes can use. False The node has not computed a result that downstream nodes can use and returns an undefined value. Note   This node may return different undefined values when executed in simulation mode versus on hardware.

Boolean value that indicates whether this node is ready to accept new input data.

Use Feedback Node to wire this output to ready for output of an upstream node.

This output is available only when you select the Four wire checkbox in the Item tab.

 True The node is ready to accept new input data. False The node is not ready to accept new input data.

Node Behaviors When x and y Are Arrays

When both x and y are arrays, this node performs calculation on the two arrays element by element. If the two arrays are of different sizes, this node performs calculation on the first N elements, where N is the number of elements of the smaller array. When one input is an array and the other is a scalar, this node performs calculation on each element of the array with the scalar.

When Does This Node Discard Data

If ready for input returns False during a given cycle, this node discards any data that other nodes send to this node during the following cycle. This node discards the data even if input valid is True during the following cycle.

Where This Node Can Run:

Desktop OS: none

FPGA: All devices

Web Server: Not supported in VIs that run in a web application