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Conformal-LP : Understanding liberty files.

nitint08
Hi

Conformal can read liberty files but the relevant lowpower special cells
are not recognised until those are specially specified with define_* cpf command.

Since Conformal has all the information of library cells (i.e. AON-cells, retention-
cells, power-switches, iso-cells,level-shifters etc) thus it would be more benefical
if this information can also be provided to the user so that he can correct his
list of cells via relevant define_* commands.

Regards
NitinT
Parents

  • Thanks for prompt response (for other queries also).

    Yes, CLP is reading liberty files and also able to report all the cells specified in it via "report library data"

    But it is not able to identify LowPower cells having relevant liberty attributes applied to them if those

    cell are not specified in CPF via "define_*" commands.

    If a normal cell is specified as Isolation-cell via "define_isolation_cell" command than it is accepted as isolation-cell.

    Thus following are observed, please confirm?

    1. LP cells are only identified via "define_*" CPF commands.

    2. Liberty attributes for Lowpower are not considered by Conformal.

    3. read library -liberty *.lib command only identify the cells and maps to cells under define_* commands.

    4. Any LP cell if not specified with define_* command but found in library and in design will not be considered as

        relevant cell and CLP will flag violation of missing cell and not incorrect cell.

    5. Is there any rule in CLP which can identify such special cells which are not defined via define_* command.

    Thanks in advance.

Reply

  • Thanks for prompt response (for other queries also).

    Yes, CLP is reading liberty files and also able to report all the cells specified in it via "report library data"

    But it is not able to identify LowPower cells having relevant liberty attributes applied to them if those

    cell are not specified in CPF via "define_*" commands.

    If a normal cell is specified as Isolation-cell via "define_isolation_cell" command than it is accepted as isolation-cell.

    Thus following are observed, please confirm?

    1. LP cells are only identified via "define_*" CPF commands.

    2. Liberty attributes for Lowpower are not considered by Conformal.

    3. read library -liberty *.lib command only identify the cells and maps to cells under define_* commands.

    4. Any LP cell if not specified with define_* command but found in library and in design will not be considered as

        relevant cell and CLP will flag violation of missing cell and not incorrect cell.

    5. Is there any rule in CLP which can identify such special cells which are not defined via define_* command.

    Thanks in advance.

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