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DFT Question about hard IP scan

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HolySaint

HolySaint

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dft_drc

Hi,
I have a module A:

module A()

B B()

endmodule

The B is a hardware IP, and it is Performed Scan Replacement.
Now I want to insert scan in my design A,and route the flip-flop in IP B which is already scan replaced.
I also don't want to change everything of the IP and just route the regs in B and regs in our design together.

Our design has the test ports. And the IP has test pins too.

How can I do to route them together?

Thanks for ur answers.
 

lan ip scan command

define hard IP scan as " add sub scan chains" in your scan insertion tool.
 

    HolySaint

    HolySaint

    Points: 2
    Helpful Answer Positive Rating
hookup_pin scan

santhosh007 said:
define hard IP scan as " add sub scan chains" in your scan insertion tool.
Click to expand...

I use the dftc to insert chains, but I dont know how to add it.
I am looking for the ug, can u give me an advice?

Thanks.
 

dc_shell with ip

I think this example may help you.

Use the following command sequence to infer the subdesign scan chain in module B :

dc_shell> current_design B
dc_shell> set_dft_signal -view spec -port scanin_b \
-type ScanDataIn
dc_shell> set_dft_signal -view spec -port scanout_b \
-type ScanDataOut
dc_shell> create_test_protocol
dc_shell> dft_drc


Use the following command sequence to include this scan chain in a top-level scan chain:

dc_shell> current_design A
dc_shell> create_test_protocol
dc_shell> dft_drc
dc_shell> insert_dft
dc_shell> dft_drc
 

    HolySaint

    HolySaint

    Points: 2
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scan hookup pin

santhosh007 said:
I think this example may help you.

Use the following command sequence to infer the subdesign scan chain in module B :

dc_shell> current_design B
dc_shell> set_dft_signal -view spec -port scanin_b \
-type ScanDataIn
dc_shell> set_dft_signal -view spec -port scanout_b \
-type ScanDataOut
dc_shell> create_test_protocol
dc_shell> dft_drc


Use the following command sequence to include this scan chain in a top-level scan chain:

dc_shell> current_design A
dc_shell> create_test_protocol
dc_shell> dft_drc
dc_shell> insert_dft
dc_shell> dft_drc
Click to expand...

I'll try that immediately。
Thanks agains~

Added after 54 minutes:

I tried as U tell me, but in the module B which is sub module,the tool added some ports in it, like test_si and test_so.
But I set ScanDataIn and ScanDataOut in my scripts, why it add the data port again?

I was so confused......
 

how to use command to scan ip

Why did the tool add ports at the module B?
 

dft testmode test_si

santhosh007 said:
try with -view existing option
Click to expand...

I mean that the added pins is module B's.

But when I want to hook up the module B's test pin into A's port,what do I need to gen the atpg for testing module B?

Thanks for your answers.
 

dftc spec

with same command i think you have an option
-hook_up
 

    HolySaint

    HolySaint

    Points: 2
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Hello Friend,

test_si and test_so has been added by tool means, tool doesn't find the scan ports. So, use hookup pin option as follows.

dc_shell> current_design B
dc_shell> set_dft_signal -view spec -port scanin_b \
-type ScanDataIn \
-hookup_pin [xxxx]

dc_shell> set_dft_signal -view spec -port scanout_b \
-type ScanDataOut \
-hookup_pin [yyyy]

///where xxxx and yyyy are the already existing test ports of the IP.

dc_shell> create_test_protocol
dc_shell> dft_drc

Hope this solves the issue.

Still u r finding the problem, I have another flow to follow.

Sunil Budumuru
www.asic-dft.com
 

faint.. It' s hard ip.. hardened one?

if so, you need its test model.., i.e., ctldb or ctlddc.

and use_test_model in top level design.
 

    HolySaint

    HolySaint

    Points: 2
    Helpful Answer Positive Rating
entropy said:
faint.. It' s hard ip.. hardened one?

if so, you need its test model.., i.e., ctldb or ctlddc.

and use_test_model in top level design.
Click to expand...

Thanks, the test model is very important as you said.

nice day!
 

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