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Format-Independent Settings

Below the tabbed area are controls which apply to all output formats.

Use auto-rename when writing CHD reference cells
This mode applies when writing a cell hierarchy containing reference cells. A reference cell is a cell in memory that has no content of its own, but rather serves as a pointer to a cell hierarchy obtained through a Cell Hierarchy Digest (CHD). When such cells are encountered when writing a hierarchy from the main database, the reference cell is replaced with the hierarchy obtained through the referenced CGD.

When writing CHD reference hierarchies, there are two algorithms that can be employed that prevent writing duplicate cell names. When this button is not selected, cells encountered with the same name as a cell previously written will be skipped, i.e., no new cell definition will be added to the output file, and all subsequent instances of the cell will call the existing definition.

When this button is selected, and a matching cell name is encountered, and the existing definition came from a different CHD, the name is changed and a new cell definition is added to the output file. References to the cell will call the cell by its new name. However, name clashes from equivalent CHD's will cause the new cell definition to be skipped, as in the default mode. An ``equivalent CHD'' can mean the same CHD in memory, or a different CHD but opened on the same file with the same aliasing.

This button tracks the state of the RefCellAutoRename variable.

Use cell override table when writing CHD hierarchies
When writing output through use of a CHD, it is possible to substitute cells in memory for those read through the CHD. Thus, locally modified cells can be inserted into the layout. When this check box is selected, cells listed in the override table will override cells of the same name as read through a CHD.

This button has the same function as the Use Cell Tab button in the Cell Hierarchy Digests panel. Both track the state of the UseCellTab variable.

Edit cell override table
This button brings up the Cell Table Listing panel, which lists the cells in the override table, and allows the table to be modified.

The Edit Cell Tab button in the Cell Hierarchy Digests panel will also display this panel.


next up previous contents index
Next: GDSII Settings Up: The Set Export Params Previous: The Set Export Params   Contents   Index
Stephen R. Whiteley 2012-04-01