Virtuoso XL Layout Editor User Guide

Generating Your Layout with Virtuoso XL Layout Editor

Information About Online Forms

■Add Correspondence Pairs Form on page 193

■Cloning Form on page 193

■Correspondence Pairs Form on page 195

■Define Connectivity Reference Form on page 195

■Display Specifi Correspondence Components Form on page 196

■Import XL Netlist Form on page 196

■Layout Generation Options Form on page 196

■Open File Form on page 200

■Pick from Schematic Form on page 200

■Remove Correspondence Components Form on page 203

■Set Pin Label Text Style Form on page 203

■Startup Option Form on page 204

Add Correspondence Pairs Form

Name in Connectivity Source lets you type the name of the connectivity point you want to be the source when you click Apply.

Name in Connectivity Target lets you type the name of the connectivity point you want to be the target when you click Apply.

Set By Cursor lets you indicate by clicking on a point with the cursor the name of the point you want added when you click Apply.

Cloning Form

Options

Draglines enables rubberbanding lines showing the closest possible connections to nets.

Correspondence File activates the Correspondence File field, to let you type in a name for a correspondence file, if you do not want to use the default name,lvs_corr_file.

Virtuoso XL Layout Editor User Guide

Generating Your Layout with Virtuoso XL Layout Editor

Create opens the Correspondence Pairs form, which lets you add correspondence points.

Target Schematic contains the circu8it which will be implemented by the clone command.

The default value for this field is the source from the cellview pair which launched the clone command.

Target Layout is the cellview where the clone will be placed. The default value for this field is the layout from which the clone command was invoked.

Find Matching Targets

Find Matching Targets on:

Entire Target Schematic performs a global search on the entire schematic to find matching objects.

Selected Set on Target Schematic performs a global search to find matching objects within the selected set.

Find Matching Targets using:

Permutation is allowed when searching for the matched components.

Exact Match requires isomorphism, instance masters, instance parameters for all matches between connectivity sources and connectivity targets.

Find Matching Targets invokes the pattern matching

Unplaced lists all components or structures that were chosen as target structures for cloning.

Placed lists all targets that have been cloned and placed in the target layout window.

Clone lets you indicate by clicking in the schematic or layout the component or structures that you want to be the targets for cloning.

Rotate rotates the component or structure to be placed 90 degrees counterclockwise.

Flip Horizontal mirrors the component or structure to be placed on the Y axis (flips it horizontally).

Flip Vertical mirrors the component or structure to be placed on the X axis (flips it vertically).

Virtuoso XL Layout Editor User Guide

Generating Your Layout with Virtuoso XL Layout Editor

Correspondence Pairs Form

Working File lets you accept the default name of the Correspondence Points File

(lvs_corr_file) or type a different name.

Add opens a form that lets you add correspondence points to the Correspondence Points

File.

Remove opens form that lets you delete correspondence points from the Correspondence Points File.

Display opens a form that lets you display individual correspondence points from the

Correspondence Points File.

Display All Pts opens a list box that shows all the correspondence points in the

Correspondence Points File.

Clear All Pts clears all correspondence points from the Correspondence Points File.

Define Connectivity Reference Form

Source specifies the connectivity source for the design.

Schematic indicates that a schematic is the connectivity reference for the design.

Netlist indicates that a netlist is the connectivity reference for the design.

None indicates that there is no connectivity reference for the design.

Library defaults to the name of the library in which the layout was opened. You can type in a different library name.

Cell lets you type in the name of the cell you want to use as a connectivity reference.

View defaults to schematic. You can type in a different view name.

Browse displays the Library Browser, which lets you click on names to fill in the form. Even if the Library Browser is already open, you must click Browse if you want the names you click on to appear in the form.

Sel by Cursor lets you specify the schematic or layout to use by clicking in the open cellview window.

Top Cell (appears only if you choose Netlist as the source) lets you enter the top cell of the netlist.

Virtuoso XL Layout Editor User Guide

Generating Your Layout with Virtuoso XL Layout Editor

Display Specific Correspondence Components Form

Identify Connectivity

Source sets the software to display the connectivity point identified as the source when you click Apply.

Target sets the software to display the connectivity point identified as the target when you click Apply

Name Of Point lets you type the name of the point you want displayed when you click Apply.

Set By Cursor lets you indicate by clicking on a point with the cursor the name of the point you want displayed when you click Apply.

Import XL Netlist Form

Netlist File specifies the name of the file to use as a netlist.

Copy copies the imported netlist file to the destination library location.

Link links the imported netlist file to the destination library location.

Move moves the imported netlist file to the destination library location.

Library specifies the name of the library in which you want to put the netlist.

Cell specifies the name of the cell in which you want to put the netlist.

View specifies the view name in which you want to store the netlist.

Browse opens the Open File form if your cursor is in the Netlist File text field. From the Open File form, you can choose any file to which you have access. If your cursor is in the Library or Cell or View fields, theBrowse button opens the Library Browser form, from which you can choose a library, cell, and view.

Format is either CDL or SPICE.

Check allows you to check the netlist for any errors before generating your layout. Any errors will be displayed in the CIW, along with a message stating that there are syntax errors which may be the result of unsupported syntaxes.

Layout Generation Options Form

Layout Generation

Virtuoso XL Layout Editor User Guide

Generating Your Layout with Virtuoso XL Layout Editor

Generate:

I/O Pins places all the pins specified in the Layout Generation Options form.

Instances places all the instances in the schematic that do not have Ignore properties attached to them.

Boundary generates a design boundary using the layer and size information you specify in the Boundary section of this form.

Transistor Chaining enables the abutment of ordered lists of MOS transistors into stacks and places them in the design.

Transistor Folding allows you to split devices into fingers which keeps the gate width from going beyond the manufacturing foundry specification size.

Preserve Mappings, if turned off, ignores previous many-to-many, many-to-one, and one-to-many mappings.

I/O Pins

Apply applies to all pins the default values to all of the pins displayed in the list box.

Pin Type lets you specify the type of pins to be placed.

Geometric specifies the layer on which you want to place the pins from theLayer/ Master cyclic field below.

Symbolic lets you choose the name of a symbolic pin cell from the Layer/Master cyclic field. If there are no symbolic pins defined in the technology file, this option is not available. If you choose this option, the Width field disappears (because symbolic pins are square).

Layer/Master lets you choose the layer for geometric pins.

The default is the current drawing layer if it is defined aslxExtractLayer in the technology file. Otherwise, the default is the first layer definedlxExtractLayeras , and the cyclic field offers only the conducting layers. If no layers have been defined as lxExtractLayer, the cyclic field shows all valid layout layers. The master displays the symbolic pins defined in the technology file. If none are shown in the cyclic field then there are no symbolic pins defined in the technology file.

Width specifies the width for each pin. The default is theminWidth property value set for the current layer in your technology file.

Height specifies the height for each pin. The default is theminWidth property value set for the current layer in your technology file.

Num specifies how many instances of this pin to create. If you type 0 in this field, the pin is not created.

Virtuoso XL Layout Editor User Guide

Generating Your Layout with Virtuoso XL Layout Editor

Create, when on, specifies which of the pins listed on the form (based on pins shown in the schematic) are to be placed on the layout.

Select allows you to type in a pin name and the pin will be selected in the list box.

Number Selected displays the number of pins that have been selected from the Select field.

Add a Pin adds a pin to the list box and to the layout after you click OK.

Update changes the Pin Type, Layer/Master, Width, Height, Num, and Create for one or more selected pins. To select more than one pin use the Control left mouse button.

Pin Type lets you specify the type of pins to be placed.

Geometric specifies the layer on which you want to place the pins from theLayer/

Master cyclic field below.

Symbolic lets you choose the name of a symbolic pin cell from the Layer/Master cyclic field. If there are no symbolic pins defined in the technology file, this option is not available. If you choose this option, the Width field disappears (because symbolic pins are square).

Layer/Master lets you choose

■The layer for geometric pins.

The default is the current drawing layer if it is defined aslxExtractLayer in the technology file. Otherwise, the default is the first layer definedlxExtractLayeras , and the cyclic field offers only the conducting layers. If no layers have been defined as lxExtractLayer, the cyclic field shows all valid layout layers.

■The master for symbolic pins.

If there are no valid symbolic pins defined in the technology file, none are shown in the cyclic field and theSymbolic Pin Type option is not available.

Width specifies the width for each pin. The default is theminWidth property value set for the current layer in your technology file.

Height specifies the height for each pin. The default is theminWidth property value set for the current layer in your technology file.

Num specifies how many instances of this pin to create. If you type0 in this field, the pin is not created.

Create, when on, specifies which of the pins listed on the form (based on pins shown in the schematic) are to be placed on the layout.

Virtuoso XL Layout Editor User Guide

Generating Your Layout with Virtuoso XL Layout Editor

Create Pin Labels puts the names of the pins on the layout.

Display Pin Name Option opens the Set Pin Label Text Style form, which allows you to set the size, font, style, justification, and orientation of the label lettering and the drawing or pin layer on which the labels are shown.

Pin Label Shape

Label creates a label on the layer specified on the Set Pin Label Text Style form.

Text creates text on the layer specified on the Set Pin Label Text Style form. If the text is not visible turn on the Pin Names option in the Display Options form.

None does not create a label or text for the pins.

Pin Label Options opens the Set Pin Label Text Style form, which allows you to set the size, font, style, justification and orientation of the label lettering and the drawing or pin layer on which the labels are shown.

Boundary

Layer specifies the layer on which you draw the cell boundary. The default is the entry layer defined by theinitBoundaryLayer environment variable. The default is the boundary entry layer.

Shape lets you set the shape to Rectangle or Polygon.

If you set Shape to Rectangle, you can set any two of the following values to define the size of the cell boundary.

Utilization (%) specifies the percentage of area within the cell boundary that you want to fill. The default is25%.

Boundary Width specifies the width of the design boundary. The default is the size of the last boundary or 10.

Boundary Height specifies the height of the design boundary. The default is the size of the last boundary or 10.

Aspect Ratio W/H is the width-to-height ratio of the design boundary. For example, a value of 1 specifies a square boundary, 0.5 specifies a boundary twice as high as it is wide, and 2 specifies a boundary twice as wide as it is high. The default is1.

Boundary Width specifies the width of the design boundary. The default is the size of the last boundary or 10.

Boundary Height specifies the height of the design boundary. The default is the size of the last boundary or 10.