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In this blog, we will see usage of UVM sub-phases by taking an example of reset test. As we know, in UVM, run_phase is divided into multiple sub-phases:

1. pre_reset_phase(), reset_phase(), post_reset_phase(): Phases involved in reset activity.
2. pre_configure_phase(), configure_phase(), post_configure_phase(): Phases involved in configuring DUT.
3. pre_main_phase(), main_phase(), post_main_phase(): Phases involved in driving main stimulus to the DUT.
4. pre_shutdown_phase(), shutdown_phase and post_shutdown_phase(): Phases involved in settling down the DUT after driving main stimulus.

In every verification environment, reset testing is a crucial feature and in many cases, we find issues. In it, user drives random sequence to the DUT and in between data transmission, reset is applied followed by driving restart sequence. So, we will see how the reset testing could be easily tested using sub-phases and “jump” feature of UVM.