EQUIVALENT_DRIVER_OPT - 2024.1 English

Vivado Design Suite Properties Reference Guide (UG912)

Document ID
UG912
Release Date
2024-05-30
Version
2024.1 English

The Vivado tool merges the drivers of all logically-equivalent signals into single drivers when the -merge_equivalent_drivers option is specified during logic optimization (opt_design). Refer to Logic Optimization in the Vivado Design Suite User Guide: Implementation (UG904) for more information.

The EQUIVALENT_DRIVER_OPT cell property lets you control which equivalent nets and drivers are merged or not when running opt_design:

  • Setting the EQUIVALENT_DRIVER_OPT property to MERGE on the original driver, and its replicas, triggers the merge equivalent driver phase during opt_design, and merges the logically equivalent drivers that have that property.
  • Setting the EQUIVALENT_DRIVER_OPT property to KEEP on the original driver, and its replicas, prevents the merging of those specified drivers during the equivalent driver merging and the control set merging phase. This excludes the specified drivers, but otherwise runs equivalent driver merging on the rest of the design.
Architecture Support
All architectures.
Applicable Objects
Cells (get_cells)
Values
  • MERGE: Enable the equivalent driver merging optimization on the specified cells only.
  • KEEP: Disables the equivalent driver merging optimization on the specified cells, but otherwise merge the rest of the design.

Syntax

Verilog Syntax

Not applicable

VHDL Syntax

Not applicable

XDC Syntax
set_property EQUIVALENT_DRIVER_OPT < MERGE | KEEP > [get_cells <instance>]

XDC Syntax Example:

# Specifies to MERGE equivalent drivers on the specified cells
set_property EQUIVALENT_DRIVER_OPT MERGE [get_cells U0/mem_reg_mux_sel_reg_0*]

Affected Steps

  • Opt Design