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Parent page: Schematic Objects
A parameter set is a design directive, allowing design specifications to be associated to a net-type object within a schematic design. For example, use a parameter set to attach PCB layout information to a net, or to declare two nets to be members of a differential pair. It is the presence of specifically named parameters in the parameter set that the software uses to determine which design directive you are placing.
Parameter sets are available for placement in the schematic editor only. Both default (empty) and pre-defined (PCB Layout, Net Class, Differential Pair, Stimulus and Test Vector Index) parameter set directives are available. The only difference between an empty parameter set and a pre-defined parameter set is that the pre-defined parameter sets include a parameter, as described below.
Access the corresponding commands from the main Place menu as follows:
|•||Place » Directives » Parameter Set||Does not include any parameters|
|•||Place » Directives » Differential Pair||Includes the parameter named DifferentialPair, the software recognizes this and displays the object as a differential pair directive|
|•||Place » Directives » PCB Layout||Includes the parameter named Rule, which must be configured to the required PCB design rule|
|•||Place » Directives » Net Class||Includes the parameter named ClassName, which must have its value set to the required PCB Net Class|
|•||Place » Directives » Stimulus||Includes the parameter named Stimulus, with a value of Stimulus|
|•||Place » Directives » Test Vector Index||Includes the parameter named Column, with a value of TestVectorIndex|
A parameter set can be used to attach parameters to a:
After launching the command, the cursor will change to a cross-hair and you will enter design directive placement mode. Placement is made by performing the following actions:
Additional actions that can be performed during placement – while the parameter set is still floating on the cursor are:
This method of editing allows you to select a placed parameter set directive directly in the workspace and change its location or orientation graphically.
When a parameter set directive is selected in the workspace, a dashed box will appear around the directive. The box encloses the area occupied by the directive only. For each visibility-enabled member parameter of the set, a dashed line will be visible, connecting the text field of the parameter to the body of the directive, which affirms association:
Click anywhere inside the dashed box and drag to reposition the parameter set as required. While dragging, the parameter set can be rotated (Spacebar/Shift+Spacebar) or mirrored (X or Y keys to mirror along the X-axis or Y-axis).
The parameter set's text fields (which can be graphically edited independently of the parent directive) can only be adjusted with respect to size by changing the size of the font (accessed through the relevant Parameter Properties dialog). As such, editing handles are not available when any of these objects are selected.
Click anywhere inside the dashed box and drag to reposition the text object as required. While dragging, the text object can be rotated (Spacebar/Shift+Spacebar) or mirrored (X or Y keys to mirror along the X-axis or Y-axis).
If the Enable In-Place Editing option is enabled on the Schematic - General page of the Preferences dialog (Tools » Schematic Preferences), you will be able to edit the value for a parameter directly in the workspace (with the exception of parameters that have been added as rules). Select the text object and then click once to invoke the feature. Type the new value as required and then click away from the text object or press Enter to effect the change.
Dialog page: Parameters
This method of editing uses the Parameters dialog to modify the properties of a parameter set.
The Parameters dialog can be accessed prior to entering placement mode, from the Schematic - Default Primitives page of the Preferences dialog (Tools » Schematic Preferences). This allows you to change the default properties for the parameter set, which will be applied when placing subsequent parameter set directives.
During placement, the Parameters dialog can be accessed by pressing the Tab key.
After placement, the Parameters dialog can be accessed in one of the following ways:
The parameter set directive's member parameters can be added, edited or removed using the Parameters dialog. The properties of a parameter are viewed or modified using the Parameter Properties dialog.
When a parameter is added as a rule, the parameter name (Rule) is locked and cannot be changed.
The parameters of a parameter set directive can be edited independently of the parent set directive. The Parameter Properties dialog can be accessed in one of the following ways:
An Inspector panel enables the user to interrogate and edit the properties of one or more design objects in the active document. Used in conjunction with appropriate filtering - by using the applicable Filter panel or the Find Similar Objects dialog - the panel can be used to make changes to multiple objects of the same kind, from one convenient location.
A List panel allows the user to display design objects from one or more documents in tabular format, enabling quick inspection and modification of object attributes. Used in conjunction with appropriate filtering - by using the applicable Filter panel or the Find Similar Objects dialog - it enables the display of just those objects falling under the scope of the active filter – allowing the designer to target and edit multiple design objects with greater accuracy and efficiency.
Multiple parameters can be added to the same parameter set object. In the image below, the Differential Pair directive was placed to touch the edge of the blanket. It was then edited to include a ClassName parameter and a Rule parameter. When the design is synchronized with the PCB, these additional elements will be created:
ROCKET_IO_LINES, with the 16 nets that are under the blanket, in it
InNetClass(' ROCKET_IO_LINES ')
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