Differences

This shows you the differences between two versions of the page.

--- asic:pnr:start [2023/11/23 17:09] – rajit
+++ asic:pnr:start [2023/11/23 17:13] (current) – rajit
@@ Line 5: / Line 5: @@
 Once the routed cell library ''.rect'' files are ready, using the same ''interact'' script described in the cell mapping step will create a layout problem for place and route that includes the correct LEF for the cells. The script is repeated here:
+<code>
+$ interact -ref=1 -Tsky130l
+interact> act:read "out.act"
+interact> act:merge "cells.act"
+interact> act:expand
+interact> act:top sdt_triple
+interact> ckt:cell-map
+interact> load-scm "phydb.scm"
+interact> phydb:create 1.8 1  "output.lef"
+interact>
+</code>
+Running this with the correct ''.rect'' files will ensure that the generated LEF will include correct pin locations, routing obstacles, etc.
 ===== Placement  =====
@@ Line 32: / Line 43: @@
 </code>
-This flow corresponds to a gridded placement flow. For gridded cells, the power buses are run after placement. To run this special power bus router, use the following commands:
+This flow corresponds to a gridded placement flow.
+===== Power routing =====
+For gridded cells, the power buses are run after placement. To run this special power bus router, use the following commands:
 <code>
 interact> pwroute:init 3
@@ Line 42: / Line 57: @@
 </code>
 Here we turn off reinforcements, as the technology does not have many metal layers. For a more modern process, the power router is capable of adding horizontal and vertical reinforcements of the power grid as well.
+===== Global routing =====
 Finally, we can run the global router called ''sproute'' as follows: