The basic concept of the digital backend to be introduced today is the boundary cell, also known as the endcap Cell. Endcap is a special standard unit. In the back-end physical design, in addition to some common standard cells, such as NAND, or some common physical cells, they usually have no logic circuits, do not exist with the netlist, but for the entire chip. Running, stability plays a decisive role. That endcap cell is one of them, it is commonly known as the corner unit, the role is to ensure that each nwell is nwell enclosed, similar to a closed loop. Mainly added at the end of the row (both sides are added), and around the memory or other blocks, as shown below:
Instructions:
command
Create_boundary_cells
Before use, you need to specify the cells such as left_boundary, right_boundary, top_boundary, bottom_boundary, etc., you can query the process manual of the process library used, as shown below:
Create_boundary_cells \
-left_boundary_cell $left_boundary_cell \
-right_boundary_cell $right_boundary_cell \
-top_boundary_cells $top_boundary_cells \
-bottom_boundary_cells $bottom_boundary_cells \
-top_right_outside_corner_cell $top_XXX_cell \
-top_left_outside_corner_cell $top_XXX_cell \
-bottom_right_outside_corner_cell $bottom_XXX_cell \
-bottom_left_outside_corner_cell $bottom_XXX_cell \
-bottom_left_inside_corner_cells $bottom_XXX_cells \
-bottom_right_inside_corner_cell $bottom_XXX_cell \
-top_left_inside_corner_cell $top_XXX_cell \
-top_right_inside_corner_cell $top_XXX_cell \
-prefix "ENDFILL" \
-separator "_"
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