4.1.2 TRY Option

The TRY pre-assignment option is the default selected by the fitter when no pre-assignment option is specified by the user. The fitter performs the design passes illustrated in Figure 4-3. The first two passes are identical to those used for the KEEP pre-assignment option. The final design pass is identical to the IGNORE pre-assignment option. Any pins that are not assigned in the design are automatically assigned by the fitter.