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defined clocks not propagate

tompy

I have a design with clocks defined at root.I can use [get_attrbute  propagated_clocks] to get clock propagate at g152/Z,

however, I cannot get propagated clock at g151/Z

  XOR2D0HVT g151(.A1 (n_2), .A2 (clk2), .Z (clk2_inv));
  XOR2D0HVT g152(.A1 (n_2), .A2 (clk1), .Z (clk1_inv));

 I can also get propagated clock at g151/A2 and g152/A2

this is pretty weird since g151 and g152 are same logic, but I can't get propagated clock at g151 output!

can someone tell me why g151 block the clock propagation? thanks!

 

Parents

  •  Hi Tompy,

     hard to tell based on the information provided. Some issue that could possibly do this:

     + edit_neltist command on output of g151

    + constraint applied to output resulting on path segmentation

    BTW, are you hand-instantiating g151 and g152. What does incoming RTL look like ? What do incoming constraints look like ?

     

    thanks,

    gh-

Reply

  •  Hi Tompy,

     hard to tell based on the information provided. Some issue that could possibly do this:

     + edit_neltist command on output of g151

    + constraint applied to output resulting on path segmentation

    BTW, are you hand-instantiating g151 and g152. What does incoming RTL look like ? What do incoming constraints look like ?

     

    thanks,

    gh-

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