boards/openroad: README

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Author: oharboe

boards/openroad/README.md

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+OpenROAD ASAP7 PDK configuration
+================================
+
+Demonstrates how to set up an [bazel-orfs](https://github.com/The-OpenROAD-Project/bazel-orfs) to build darksocv with[OpenROAD-flow-scripts](https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts)
+
+To build and view [Install Bazelisk](https://bazel.build/install/bazelisk) and run:
+
+    bazel run //boards/openroad:darksocv_cts /tmp/cts gui_cts
+
+Register to register histogram
+------------------------------
+
+![alt text](reg2reg-histogram.png)
+
+Estimated routing congestion
+----------------------------
+
+![alt text](routing-congestion.png)
+
+Ideas for future work
+=====================
+
+- reduce clock period
+- darkram.v should consist of serveral SRAMs connected together to be
+  a more accurate representation
+- create a mock SRAM representation with somewhat realistic timing
+- add IO constraints to place pins on one edge of the SRAMs and top level
+- reduce area
+
+[MegaBoom](https://github.com/The-OpenROAD-Project/megaboom) demonstrates a number of techniques to study a design and set up mock SRAMs.