Alternate Footprints in TILPs

The cell names of footprints in a TILP can be specified as not allowed, must be included, or alternate footprints based on a specific syntax. You do this either in the altFootprintCellNames column in a part.csv file or in the footprintALTCellName text field in the Edit Instance Properties form.

Use the following guidelines to specify placement of certain footprints or parts for use in TILPs:

• The altFootprintCellNames column in a part.csv can specify that certain parts are not allowed in particular placements by specifying the placement as NONE. For example,(TOP:CAP1005N;BOTTOM:NONE)where BOTTOM:NONE means that this part is not valid on the BOTTOM placement.
• There is no change in the placement of a footprint cell when altFootprintCellNames is not formated as (TOP:1005;BOTTOM:SPDT;EMBEDDED:LGA).
• If altFootprintCellNames is shown as (TOP:1005;BOTTOM:SPDT;EMBEDDED:LGA)and the Stackup Offset parameter is not 0, the cell name specified by the EMBEDDED keyword is used as the footprint cell. For example, LGA is used as the cell name in this example.
• If altFootprintCellNames is shown as (TOP:1005;BOTTOM:SPDT;EMBEDDED:LGA)and the Mirrored parameter is nil, the cell name specified by the TOP keyword is used as the footprint cell. For example, 1005 is used as the cell name in this example.
  If the Mirrored parameter is t, the cell name specified by the BOTTOM keyword is used as the footprint cell. For example, SPDT is used as the cell name in this example.
• If a specific keyword is not specified at the instance place, that is, if altFootprintCellNames is shown as (TOP:1005;BOTTOM:SPDT) and the Stackup Offset parameter is 2, the footprintCellName parameter is used as the footprint cell.
  If the given cell name does not allow retrieval of an existing cell in a TILP, the Pcell evaluation fails and a marker is dropped in the sub-master cellview. The given cell name for placement overrides the existing footprintCellName parameter.