Isolation cells are a must-use for SoC low power design. This article covers:
- Schematics of source type and destination type iso low cells
- How source-type and destination-type iso low cells work and how to use them properly
- Issues if source type is used as destination type and if destination type is used as source type
- Why sometimes we need to build iso low cells from regular cmos gates and how to build
- Schematic of iso high cell and how it works.
When a signal comes from a power-off domain to a kept-on domain, isolation cell is needed to make sure inputs of on-domain gates are not floating. Below diagram shows isolation cell is placed at kept-on domain and this kind of iso cell is called destination type. We can also place isolation cell at power-off domain and this kind is called source-type iso cell.
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