

Command Reference 2.  FPGA Express Shell Commandsset_module_dont_touch


_N_A_M_E
          set_module_dont_touch
                         Specify dont touch option for
                         optimization.


SYNTAX
          string set_module_dont_touch
                 {_t_r_u_e | _f_a_l_s_e | _i_n_h_e_r_i_t}
                 [ -_a_l_l ]
                 _m_o_d_u_l_e__l_i_s_t

         list _m_o_d_u_l_e__l_i_s_t


ARGUMENTS
          _t_r_u_e           For those modules on which dont touch
                         has been set to _t_r_u_e nothing is changed
                         in the design. All cells, nets remain
                         exactly the way they are in the input.
                         No optimization is done on the module,
                         i.e.  no constants are propagated in the
                         design, no duplicate cells are removed,
                         none of the cells in the module will be
                         trimmed away.

                         Only one of _t_r_u_e, _f_a_l_s_e or _i_n_h_e_r_i_t can
                         be specified.


          _f_a_l_s_e          Allows the module to be optimized. i.e.
                         Constants are propagated in and through
                         the design. Certain cells could be
                         optimized away.  Duplicate cells if
                         exists in the design may be removed.

                         Only one of _t_r_u_e, _f_a_l_s_e or _i_n_h_e_r_i_t can
                         be specified.


          _i_n_h_e_r_i_t        This option if set on a module, the
                         module inherits the parent module's dont
                         touch option.


          -_a_l_l           Sets the dont touch attibute on all
                         instances of the specified module(s).
                         By default the dont touch option is
                         _i_n_h_e_r_i_t.


          _m_o_d_u_l_e__l_i_s_t    List of modules to which apply these


v3.0      Synopsys Inc. 1988-1998. All rights reserved.       2-1


set_module_dont_touc2h.  FPGA Express Shell Commands  Command Reference


                         _t_r_u_e, _f_a_l_s_e or _i_n_h_e_r_i_t options.


DESCRIPTION
          Setting the dont touch option to _t_r_u_e on a module
          forbids optimization of the module.

          If dont touch is set to _t_r_u_e on a module, by default,
          hierarchy is preserved on that module.

          If dont touch is set on a hierarchical module say M
          then all the cells and modules contained in M _i_n_h_e_r_i_t
          the dont touch option of M.

          If dont touch option has not been set on any module
          then by default, modules _i_n_h_e_r_i_t the parent module's
          dont touch option.

          dont touch on the root design is always _f_a_l_s_e, It is an
          error to set dont touch on the root design.

          dont touch cannot be set to _t_r_u_e on a module containing
          generic logic in it.


EXAMPLES
               fe_shell > load_project myproject1
               fe_shell > list_chip
               chip: prep4_v WORK prep4 MRA ...
                 chip: prep4_opt WORK prep4 MRA ...
               fe_shell > current_chip prep4_v
               fe_shell > get_module *
               /prep4_v
               fe_shell > set_module_dont_touch true prep4_v


2-2       Synopsys Inc. 1988-1998. All rights reserved.      v3.0