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How to set_current_module in RTL Compiler??

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Hi all,

I need to perform synthesis of a sub-block of the design. And then merge it with the top design.
I am using RTL Compiler.

In pks or build gates this was simple, we had the command set_current_module .. and one can then perform synthesis on a subdesign.

There seems to be no direct equivalent of set_current_module in RTL Compiler.

I found one command in RTL Comiler, derive_environment.
This promotes a subdesign to a topdesign.
So in design database we will now have
/designs/topdesign
/designs/subdesign_promoted_top

The synthesis which I perform on /designs/subdesign_promoted_top is now independent of actual topdesign.

This  works. But how can I later merge the
/designs/subdesign_promoted_top
into
/designs/topdesign ??

I see no way to do this in the userguide!

Can someone help me?

Thanks in advance,
Pradeep


Originally posted in cdnusers.org by spveer
Parents

  • Hi Max,

    I tried using this...
    edit_netlist new_instance -name SUBDESIGN_INST_NAME /designs/subdesign_promoted_top /designs/topdesign

    now on the topdesign I have an unconnected instance in the hierarchy,  called SUBDESIGN_INST_NAME

    If I try to optimize, since this instance is unconnected, and not driving any ports, the instance is removed by synthesis.

    ------
    I also tried the following:

    The hierarchy looks like this:
    /designs/topdesign/instances_hier/xxxx
    /designs/topdesign/instances_hier/subdesign  ----- this is promoted to subdesign_promoted_top
    /designs/topdesign/instances_hier/SUBDESIGN_INST_NAME  ---- this is subdesign_promoted_top copied back into topdesign


    now I removed subdesign
    rm /designs/topdesign/instances_hier/subdesign

    So the hierarchy now looks like this:
    /designs/topdesign/instances_hier/xxxx
    /designs/topdesign/instances_hier/SUBDESIGN_INST_NAME  ---- this is subdesign_promoted_top copied back into topdesign

    then I have run 'synthesize'... But however the tool sees /designs/topdesign/instances_hier/SUBDESIGN_INST_NAME, not driving any ports and optimizes it away.... but doesnt link it to topdesign!! :(

    ----

    I am still not sure, how to link the designs....


    Originally posted in cdnusers.org by spveer
Reply

  • Hi Max,

    I tried using this...
    edit_netlist new_instance -name SUBDESIGN_INST_NAME /designs/subdesign_promoted_top /designs/topdesign

    now on the topdesign I have an unconnected instance in the hierarchy,  called SUBDESIGN_INST_NAME

    If I try to optimize, since this instance is unconnected, and not driving any ports, the instance is removed by synthesis.

    ------
    I also tried the following:

    The hierarchy looks like this:
    /designs/topdesign/instances_hier/xxxx
    /designs/topdesign/instances_hier/subdesign  ----- this is promoted to subdesign_promoted_top
    /designs/topdesign/instances_hier/SUBDESIGN_INST_NAME  ---- this is subdesign_promoted_top copied back into topdesign


    now I removed subdesign
    rm /designs/topdesign/instances_hier/subdesign

    So the hierarchy now looks like this:
    /designs/topdesign/instances_hier/xxxx
    /designs/topdesign/instances_hier/SUBDESIGN_INST_NAME  ---- this is subdesign_promoted_top copied back into topdesign

    then I have run 'synthesize'... But however the tool sees /designs/topdesign/instances_hier/SUBDESIGN_INST_NAME, not driving any ports and optimizes it away.... but doesnt link it to topdesign!! :(

    ----

    I am still not sure, how to link the designs....


    Originally posted in cdnusers.org by spveer
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