Command Reference    2.  FPGA Express Shell Commasnedts_chip_constraint_driven



_N_A_M_E
          set_chip_constraint_driven
                         Enable constraint driven optimization on
                         a chip.


SYNTAX
          string set_chip_constraint_driven [-_e_n_a_b_l_e | -_d_i_s_a_b_l_e]



ARGUMENTS
          -_e_n_a_b_l_e        Enable constraint driven optimization on
                         the current chip.

          -_d_i_s_a_b_l_e       Disable constraint driven optimization
                         on the current chip.


DESCRIPTION
          Selecting the -_e_n_a_b_l_e option enables constraint driven
          optimization on the current chip. When the chip is
          optimized with constraint driven optimization enabled,
          the optimization algorithms will attempt to achieve the
          timing goals (constraints) defined for this chip.  This
          option will only take effect if the current
          optimization "objective" of the chip is "speed" (See
          set_chip_objective).

          Selecting the -_d_i_s_a_b_l_e option disables the constraint
          driven optimization on the current chip. When the chip
          is optimized with constraint driven optimization
          disabled, the optimization algorithms will use
          internally generated timing constraints with the goal
          of achieving the fastest chip or smallest chip
          possible, depending on the current "objective".  See
          set_chip_objective.

          The current chip must be defined by using the command
          current_chip before executing this command, otherwise
          an error will be reported.

          The set_chip_constraint_driven command must be issued
          on an unoptimized chip -- prior to issuing the
          optimize_chip command.

EXAMPLES
          Enable constraint driven optimization on the chip
          "mychip1".

          fe_shell > current_chip mychip1
          fe_shell > set_chip_constraint_driven -enable



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






set_chip_constraint_dr2i.venFPGA Express Shell Commands     Command Reference



          Disable constraint driven optimization on the chip
          "mychip1".

          fe_shell > current_chip mychip1
          fe_shell > set_chip_constraint_driven -disable


SEE ALSO
          current_chip(2), set_chip_objective(2)














































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