Transactional Energy Modelling

The POWER3 part is non-examinable.

SystemC TLM POWER2 library release:

• Deals with power `modes' and `phases' of subsystems,
• Was difficult to integrate with loosely-timed modelling,
• Could not record energy consuming events, such as individual bus transactions,
• Power consumption for a component read from a table that must always be manually created.

Cambridge TLM POWER 3 library for SystemC:

• Supports power and energy equally well, with power calculations being accurate at the end of each LT quantum.
• Requires each component to inherit the Prazor base class (current implementation),
• Enables physical size of components to be logged (e.g. as a basis for nominal place and route),
• Supports X-Y co-ordinates to be allocated to each component (a concrete layout),
• Wiring distances can be estimated using Rent's rule OR measured from X-Y coordinates if placed,
• Power/energy consumption for a component can depend on constructor args (e.g. memory size, bus width).
• Counts bit flips in generic payload and multiplies by length of the bus.
• A 'recompute_pvt' method of each module is called when supply voltage (or temperature etc) is changed.