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  • Driving an internal net in UVM

Driving an internal net in UVM

UVM 6753
#uvm 278 #systemverilog 102
xfinity
xfinity
Full Access
52 posts
July 02, 2020 at 2:00 pm

Hello Everyone,

I have an internal net called wire P_HOOK under a design. My requirement is to drive this signal in UVM sequence
How do i do that

so far i did 

interface test1 (input clk);
 
logic p_hook;
 
endinterface
 
bind design_top: `DUT.design_top_test1 test1_0 (
.p_hook(`DUT.design_top.u_vdiv.P_HOOK)
);

When i try to access this in my uvm sequence 
class test_sequence extends uvm_sequence ...
 
virtual test1 vif;
 
task drive ();
vif.p_hook = 1'b1;
endtask
 
endclass

I get the following error : Usage of 'vif.p_hook' inconsistent with 'net' object.

Can anyone tell what i am doing wrong

Thanks

Replies

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chr_sue
chr_sue
Full Access
3896 posts
July 02, 2020 at 11:32 pm

In reply to tejasakulu:

Never drive a signal form a sequence or test. There is no timing synchronization. You have to do this from the driver.

xfinity
xfinity
Full Access
52 posts
July 03, 2020 at 7:41 pm

In reply to chr_sue:

Do what ?

chr_sue
chr_sue
Full Access
3896 posts
July 03, 2020 at 11:23 pm

In reply to tejasakulu:

A sequence does not have signals. It is class and it has data members.
I believe you want to make your sequence dependent on an internal state right?

xfinity
xfinity
Full Access
52 posts
July 11, 2020 at 12:12 pm

In reply to chr_sue:

Sorry for the late reply.

Now i understood your post #1, i should do this in my driver; sequence should be kept independent of the driving the signals.

does my code make sense ? if i put that piece of code in driver instead of sequence.

Thanks,
Tejas

chr_sue
chr_sue
Full Access
3896 posts
July 11, 2020 at 11:19 pm

In reply to tejasakulu:

A general remark: forcing an internal signal in your design is a very dangerous thing. You should do this only during development to check something.
The code you are showing does not have an relationship to any time or clock cycles. This will not do what you are expecting.

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