docs/IC/physical_verification/design_manual/drm_12_2.rst

12.0.2 Die Corners Guidelines
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1. No active circuitry is allowed within 400 um of corner of die (see figure below for illustration).

2. Within 400 um of the die corner must use 45-degree turn away direction for both metal line and slot.

3. Minimum metal to die corner spacing is 300 um.

.. image:: images/Stress.png
    :width: 400
    :align: center
    :alt:  Die Corners Guidelines