open-source test doc update (MPW5)

Signed-off-by: Mehdi Saligane <mehdi.saligane@gmail.com>

README.rst

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 Google, NIST, and University of Michigan are working together to create a fully open test tile design using the `OpenFASoC generator approach <https://github.com/idea-fasoc/OpenFASOC>`_ and open source tooling. More details can be found at the following links;
 
-* `GitHub repository with OpenFASoC generator <https://github.com/idea-fasoc/OpenFASOC/tree/main/openfasoc/generators/cryo-gen>`_
-* `GitHub repository with OpenFASoC generator <https://github.com/idea-fasoc/OpenFASOC/tree/main/openfasoc/generators/gdsfactory-gen/line-res_via-chain>`_
-* `GitHub repository with OpenFASoC generator <https://github.com/idea-fasoc/OpenFASOC/tree/main/openfasoc/generators/gdsfactory-gen/gdsfactory-gen/mimcap-array>`_
+.. image:: docs/sky130-testtile/resultanttestdie.png
+   :width: 80%
+   :align: center
+   :alt: Resultant test die from MPW-5.
+
+* Test Interface
+
+.. image:: docs/sky130-testtile/testinterface.png
+   :width: 70%
+   :align: center
+   :alt: Probing Card.
+
+* `GitHub repository with OpenFASoC Ring Oscillators generator <https://github.com/idea-fasoc/OpenFASOC/tree/main/openfasoc/generators/cryo-gen>`_
+
+.. image:: docs/sky130-testtile/cryo-gen.png
+   :width: 80%
+   :align: center
+   :alt: Example of Ring Osc. structures.
+
+sky130_fd_sc_hd, sky130_fd_sc_hs, sky130_fd_sc_hvl based ring osc.
++ 
+9 additional OSU standard cell ring osc. : 12T_hs, 12T_ms, 15T_hs, 15T_ls, 15T_ms, 18T_hs, 18T_ls, 18T_ms
+
+.. image:: docs/sky130-testtile/ROs.png
+   :width: 80%
+   :align: center
+   :alt: Ring Osc. structures.
+
+More details about the ring oscillators generator can be found `here <https://docs.google.com/presentation/d/1oROHp4B55McL_V3XpsjWqH9fspBz7vrPsw5zF5Ex_8M>`_.
+
+* gdsfactory based generators which includes line and via chain resitance, MIM capacitor modules, diodes modules, etc..
+
+.. image:: docs/sky130-testtile/gdsfactory-gen.png
+   :width: 80%
+   :align: center
+   :alt: line and via resistance + cap. and diodes meshes.
+
+* `GitHub repository with line resitance via chain generator <https://github.com/idea-fasoc/OpenFASOC/tree/main/openfasoc/generators/gdsfactory-gen/line-res_via-chain>`_
+* `GitHub repository with MIM cap. array generator <https://github.com/idea-fasoc/OpenFASOC/tree/main/openfasoc/generators/gdsfactory-gen/mimcap-array>`_
 
 The first test version of this tile was included in the MPW-5 run and can be found at;
 

docs/sky130-testtile/ROs.png

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docs/sky130-testtile/cryo-gen.png

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docs/sky130-testtile/gdsfactory-gen.png

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docs/sky130-testtile/resultanttestdie.png

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docs/sky130-testtile/testinterface.png

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