Layering Sequences
Many protocols have a hierarchical definition - for example, PCI express, USB 3.0, and MIPI LLI all have a Transaction Layer, a Transport Layer, and a Physical Layer.
![](https://res.cloudinary.com/dlzix82l9/image/upload/f_auto/v1689454912/UVM-Cookbook/Sequences-Chapter/uvm-cookbook_layering-sequences_dctib0.jpg)
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