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RESOURCE_SHARING
RESOURCE_SHARING Description
RESOURCE_SHARING is a synthesis constraint. It enables or disables resource sharing of arithmetic operators. Allowed values are YES (check box is checked) and NO (check box is not checked). (TRUE and FALSE ones are available in XCF as well). By default, resource sharing is enabled.
RESOURCE_SHARING Architecture Support
RESOURCE_SHARING Applicable Elements
You can apply RESOURCE_SHARING globally or to design elements.
RESOURCE_SHARING Propagation Rules
Applies to the entity or module to which it is attached.
RESOURCE_SHARING Syntax Examples
ECS Schematic Editor
Not applicable.
VHDL
Before RESOURCE_SHARING can be used, it must be declared with the following syntax:
attribute resource_sharing: string;
After RESOURCE_SHARING has been declared, specify the VHDL constraint as follows:
attribute resource_sharing of entity_name: entity is “yes”;
For a more detailed discussion of the basic VHDL syntax, see the "VHDL" section of the "Constraint Entry" chapter.
Verilog
Specify as follows:
// synthesis attribute resource_sharing [of] module_name [is] yes;
For a more detailed discussion of the basic Verilog syntax, see the "Verilog" section of the "Constraint Entry" chapter.
ABEL
Not applicable.
NCF
Not applicable.
UCF
Not applicable.
XCF
MODEL “entity_name” resource_sharing={yes|no|true|false};
BEGIN MODEL “entity_name”
NET “signal_name”
resource_sharing={yes|no|true|false};END;
Old XST Constraint File
No attribute declaration is required. An attribute can be directly specified using the following syntax:
attribute resource_sharing of {entity_name|signal_name}: {entity|signal} is “{yes|no}”;
The default value is YES.
For more details, see the "Old XST Constraint File" section of the “Constraint Entry” chapter.
Constraints Editor
Not applicable.
PCF
Not applicable.
Floorplanner
Not applicable.
PACE
Not applicable.
FPGA Editor
Not applicable.
XST Command Line
Define globally with the -resource_sharing command line option of the run command. Following is the basic syntax:
-resource_sharing {YES|NO}
The default is YES.
See the "Command Line Mode" chapter in the XST User Guide for details.
Project Navigator
Set RESOURCE_SHARING globally with the Resource Sharing option in the HDL Options tab of the Process Properties dialog box within the Project Navigator.
With a design selected in the Sources window, right-click Synthesize in the Processes window to access the appropriate Process Properties dialog box.
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