Certain optimizations can be performed on specific objects rather than the entire design. These optimizations are triggered by object properties. Logic Optimization detects the presence of these properties and automatically runs the necessary optimization phases.
This is true for all properties except for shift register optimizations properties,
which require the -shift_register_opt option. The following is a
summary of properties for object-specific optimization.
| Property | Description |
|---|---|
| MUXF_REMAP | Set to TRUE on MUXF primitives to convert them to LUTs |
| CARRY_REMAP | Set the threshold on CARRY primitives to convert to LUTs |
| SRL_TO_REG 1 | Set to TRUE on SRL primitives to convert them to register chains |
| REG_TO_SRL 1 | Set to TRUE on register chains to convert them to SRL primitives |
| SRL_STAGES_TO_REG_INPUT 1 | Set to the appropriate value on an SRL primitive to move a register across its input |
| SRL_STAGES_TO_REG_OUTPUT 1 | Set to the appropriate value on an SRL primitive to move a register across its output |
| LUT_REMAP | Set to TRUE on cascaded LUTs to reduce LUT levels |
| CONTROL_SET_REMAP | Set on registers to specify the type of control signal to remap to LUTs |
| EQUIVALENT_DRIVER_OPT | Set on logically-equivalent drivers to force or prevent merging |
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