Power Domain Vs Voltage Domain

Luke lang is senior product engineering manager at cadence.

Power domain vs voltage domain.

Each power domain needs to have a default supply net. You could mix both techniques. Power domain is an area having a specified voltage. 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.

Separate power grids are created for the two domains. 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. Power domains as free models of theories of non determinism. Voltage domain means you have a multiple voltage different values to supply the digital core you need level translators between domains.

Two power domains are created on the chip namely the gated power domain and the continuous clock domain. Power domain means you could switch off on the domain you need isolators element between domains. 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. And all mix between voltage power domains are allow for lof ot fun.

In the diagram three power domains are shown a b and c. Domain theorists have come to understand power domains abstractly as free models for theories of non determinism. The upf command create power domain is for this. 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.

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. Power domains means power on off required isolator cell. Because of this huge power loss it is not practical to design a soc with single voltage domain at high frequency. 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.

Each voltage domain has a separate library associated with it. Voltage domains do not have the same voltage values so required level shifters. A snippet of the upf script for these steps are. Next the supply port and nets are created for the power domain.