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Uvm connect driver tosequencer

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2021530 — The lens is transparent piece of glass or plastic which has a curved surface. There are two types of lenses: converging (convex lens) and ...

It is challenging to pinpoint the problem without a functioning representative testcase. It’s conceivable that other sequences are being performed that compete with this sequence since the lock() function waits until the sequence is arbitrated.

In reply to cgales: I tried with p_sequencer.seqr.lock( this ); // Lock the sub-sequencer by ‘this’ sequence but still, it is not working. Could you please help?

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Thanks for the reply. sqa.start(p_sequencer.seqr); is not executing at all. only seqb is completed and the test is getting killed. If I remove the lock on the sequencer, both sequences are interleaving.

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Uvmsequencerarbitration

From the documentation: A lock request will be arbitrated the same as any other request. A lock is granted after all earlier requests are completed and no other locks or grabs are blocking this sequence.

Below is my sample virtual sequence from which I am driving two other sequences. Trying to lock a sequence on a particular seqr from p_seqr. But it is not working as expected. Can you please guide me in this?

My understanding of the lock is that the call to lock suspends any sequences already running on the sequencer and gives the virtual sequence that called lock exclusive control over the sequencer until unlock has ben called.

If sequence A calls lock() after sequences B and C call start_item(), the current items for B and C won’t be blocked (or suspended). When B and C make their next calls to start_item(), those will be blocked until A unlocks.

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Uvm_declare_p_sequencer

A grab request is put in front of the arbitration queue. It will be arbitrated before any other requests. A grab is granted when no other grabs or locks are blocking this sequence.

Have a look at uvm_sequencer_base.svh source code. Both lock() and unlock() call m_lock_req(), just with a different flag. Here is the key code that adds the requested sequence to the queue.

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Virtualsequencer

A lock request will be arbitrated the same as any other request. A lock is granted after all earlier requests are completed and no other locks or grabs are blocking this sequence.

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The second argument of the call to start is important because it identifies the calling sequence, whichis the virtual sequence that currently has the lock, as the parent of child sequence; Without thisargument, the child sequence would be blocked from running until the virtual sequence had called unlock, leading to immediate deadlock.

We may be in total agreement. To me, suspend means that a process or thread stops running because of an outside action, like how on a CPU, a hardware interrupt suspends the current process. This is not what is happening with sequences. A sequence calls start_item() and fully expects to be blocked if the driver is still sending another item, or the sequencer is locked or grabbed.

Uvm_sequencer

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Looking at the UVM Cookbook regarding locks, you want to pass the sequence doing the locking instead of the sub-sequence.

Thanks for pointing the example. Now it is working, after i changed the sequence start method call as it was in the example.

Without a running representative testcase, it is difficult to isolate the issue. The lock() call waits until the sequence is arbitrated, so it’s possible that other sequences are being run which competes with this sequence.

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In reply to Agnes0: This is not correct. The lock sequence does not belong to the arbitration process. It has precedence over all other sequences. See here a running example

Thanks Chris. I visited the UVM Standard. It says: “A lock request is arbitrated the same as any other request. A lock is granted after all previously arbitrated requests are completed and no other locks or grabs are blocking this sequnnce.” Nothing is suspended.

In reply to adityaprasad123: Dou know this example UVM: Virtual sequence calling lock(1) - EDA Playground Please try it and compare with your approach.

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Uvm_sequence

Each of these numbers and letters relays essential information, such as focal length, maximum aperture, lens version and focusing motor.

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In all the examples, I referred to, the lock is always called from the body of a sequence which is generating seq_items. Is it not possible to call lock from a virtual sequence as in my case?