How to monitor DUT outputs from a test/sequence?

UVM
1

Hello, I am learning UVM. So far I was able to create the following environment for my DUT.

Agents with monitors, drivers and sequences for all of the input-output interfaces from my DUT.
A top level UVM env.
Sequences to send valid data to DUT. I yet to implement scoreboard.

I’m having some trouble to understand how to handle scenarios like following:

For a tb-dut interface, TB needs to wait for an event (or transaction) from DUT. Once it receives the transaction, TB needs to send back a response. What is the best way to implement this? How can I monitor DUT transaction from sequence? My agents have monitors which will monitor any new output signals from DUT. So, do I need to somehow bring this data from agent’s monitor to my test/sequence class? I know that monitor has an analysis port and it can be used to send received data to scoreboard for checking. So, do I need to use the same port to read DUT output data, create valid response and send it to DUT?

Thanks!

2

This is know as a slave sequence or responder. The protocol is as follows

  1. Slave sequence sends a request to the driver - “Tell me what to do”
  2. Driver detects a bus level request and returns the information back to the sequence - “This is what you should do”
  3. Slave sequence does what it needs to do to prepare a response and then sends a response item to the driver - “Here you go”
  4. Driver completes the bus level response with the contents of the response item, completes handshake back to the sequence - “Thank you”

This is explained in more detail in the Verification Academy UVM Cookbook.