o
Logical Grouping (UPF create_power_domain
-elements): All instances specified as elements of a power domain
ideally need to be placed together physically.
o
Area Estimation: Estimate the total area
required for all the standard cells and macros belonging to the power domain. Add
margin for internal routing, CTS buffers, and special cells (power switches,
isolation cells often placed at the boundary).
o
Power Grid Considerations: The voltage
area needs its own internal power grid distribution (stripes/rails) connected
appropriately to either the global grid (for always-on domains) or through
power switches (for switchable domains). The size and shape must accommodate
this grid.
o
Based on above factors and required utilization
of voltage area, we can determine domain area.
o The voltage area (create_voltage_area): Associate
the physical area with the logical power domain name from UPF. Use placement
guidance features (regions, fences) to enforce that cells belonging to the
domain are placed within the defined voltage area.
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