Pin Accessibility of Blockages in Abstract Generator
Pins are accessible from the side if they are less than one routing grid distance from the blockage edge, and the command FROUTE.ALLOW.PINACCESS.ATBLOCKAGEEDGE is set to TRUE. The command FROUTE.ALLOW.PINACCESS.ATBLOCKAGEEDGE controls FRoute only, and not the line probe router.
The line probe router (LPR) will not route to any pin that is surrounded by a blockage on that layer.
In the following figure, pins are accessible by routing over the cell with M2, and dropping a via to M1 (Via12 is a via from M1 to M2).
If your library has blockages defined as shown above, you must route the clock tree with GRoute and FRoute, and not CRoute Balance.
Guidelines for Defining Blockages in a Cell Library
On-grid Versus Off-Grid Blockages in Abstract Generator
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