In previous post, we discussed why isolation cells are required in low power design. Let’s look at the types of isolation cells available in low power design.
- Isolation cell with clamp_value 1: In isolation mode, this cell drives 1 to its downstream logic. In normal mode, it acts as a buffer. This is similar to OR gate.
- Isolation cell with clamp_value 0: In isolation mode, this cell drives 0 to its downstream logic. In normal mode, it acts as a buffer. This is similar to AND gate.
- Latch type Isolation cell: In isolation mode, this cell will keep the latched value and drive its downstream logic. In normal mode it acts as a buffer. This is similar to Latch.
- Enable Level Shifter cell: This type of Isolation cells can perform both level-shifting and isolation functions. It is used where a signal crosses from one power domain to another, where the two voltage levels are different and the first domain can be powered down.
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