Power Domain Vs Voltage Domain

Next the supply port and nets are created for the power domain.

Power domain vs voltage domain.

A snippet of the upf script for these steps are. An increasingly common technique to reduce dynamic power is the use of multiple voltage islands domains which allows some blocks to use lower supply voltages than others or to be completely. For placement and optimization in a top down situation where the design is being implemented as a whole a tool needs to understand that power domain boundaries must be honored. Separate power grids are created for the two domains.

Power domain means you could switch off on the domain you need isolators element between domains. Voltage domain means you have a multiple voltage different values to supply the digital core you need level translators between domains. How i can assign two separate power domains to different voltage sites in an ip block and later assign them their respective primary power nets and avoiding any problem like the above which doesnt let the tool to add the necessary level shifter cells in pd levelshift for upscaling the signals coming from 0 90v part. All the power domains must be part of a top level power domain.

For those that are used to upf 1 0 power domain it would be much easier to think of cpf power domain as voltage island. Power domains means power on off required isolator cell. To reduce the power consumption design was divided into multiple voltage or power domains each with its own supply voltage and this type of approach is called multi voltage design. Two power domains are created on the chip namely the gated power domain and the continuous clock domain.

And all mix between voltage power domains are allow for lof ot fun. Just as the finite powerset construction is the free semilattice the powerdomain constructions should be understood abstractly as free models of theories of non determinism. Each voltage domain has a separate library associated with it. In normal functioning the grids are shorted at a number of points to ensure that current flows between the two domains and voltage differences are minimal.

Voltage domains do not have the same voltage values so required level shifters. The upf command create power domain is for this. Each power domain needs to have a default supply net. Because of this huge power loss it is not practical to design a soc with single voltage domain at high frequency.

In the diagram three power domains are shown a b and c. Regardless of how you want to think about cpf and upf 1 0 power domains make sure you know that they are not exactly the same. Luke lang is senior product engineering manager at cadence. You could mix both techniques.