Testbench Architecture in SystemVerilog

Part 6 · Testbench Architecture · Intermediate

5topics
23lessons

A layered testbench separates stimulus, driving, observation, and checking into classes joined by mailboxes. The class world touches the DUT only through virtual interfaces owned by the static harness.

Learning path from testbench anatomy through stimulus, checking, and regression to UVM.

Suggested order. Each stage feeds the next, from harness to regression to UVM.

The five topics

Topic	Lessons	What it covers	Time
Testbench Anatomy & Layering	4	How a layered testbench is organized, from the static harness to tests and a complete example.	30 min
Stimulus: Generators, Transactions & Drivers	8	Stimulus flow plus constraint shaping: transactions, generators, drivers, and closure.	65 min
Monitors, Scoreboards & Reference Models	4	Passive monitors, scoreboards and reference models that prove a testbench checked the DUT.	30 min
Self-Checking Tests & Regression	4	Self-checking tests that print their own verdict, plus seeds, logging, and the regression flow.	30 min
From Hand-Built TB to UVM	3	Map each hand-built testbench piece to its UVM counterpart and plan the migration.	25 min

Check yourself Why do the generator and driver communicate through a mailbox instead of a direct method call?

The mailbox decouples their timing, so the generator can randomize ahead while the driver consumes transactions at DUT pace. It also lets both run as independent threads.

Related topics

Up nextTestbench Anatomy & Layering

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The five topics

Topic	Lessons	What it covers	Time
Testbench Anatomy & Layering	4	How a layered testbench is organized, from the static harness to tests and a complete example.	30 min
Stimulus: Generators, Transactions & Drivers	8	Stimulus flow plus constraint shaping: transactions, generators, drivers, and closure.	65 min
Monitors, Scoreboards & Reference Models	4	Passive monitors, scoreboards and reference models that prove a testbench checked the DUT.	30 min
Self-Checking Tests & Regression	4	Self-checking tests that print their own verdict, plus seeds, logging, and the regression flow.	30 min
From Hand-Built TB to UVM	3	Map each hand-built testbench piece to its UVM counterpart and plan the migration.	25 min

Check yourself Why do the generator and driver communicate through a mailbox instead of a direct method call?

The mailbox decouples their timing, so the generator can randomize ahead while the driver consumes transactions at DUT pace. It also lets both run as independent threads.