UPF Essential

• Power Domain - collection of instances powered in the same way
• Power Scope - The instance in which a power domain is defined.

• Power Extent - set of instance belong to a power domain.

  • an instance can be scope of multiple power domains.
  • an instance can only be extent of one power domain.

• Donut Power Domain - power domain inside power domain.

• power domain can be contiguous or non-contiguous

• power domains share same primary supply can be composed to a larger power domain.

• it's an error if any instance is not included in a power domain

• driver

• receiver

• source - the driver and port a signal pass through on the way

• sink - the receiver and port a signal pass through on the way

Power Isolation

Power Retention

• Ballon Latch - retention value saved in a dedicated latch
• Master-slave register retention style

Power Switch

Power Supply

The electric current of a supply can be from one of:

1. on-chip voltage regulator
2. embed power switch
3. a biase generator
4. off-chip supply source

Logic Hierarchy

• HighConn
• LowConn

Design Structure

Transistor -> Standard Cell -> Hard Macro

• LowConn - port declaration, inside module
• HighConn - port instance and the net connected, outside module