Prior to running power optimization, you can optionally set power optimization constraints to
identify portions of the design that need to be optimized for power. The
set_power_opt command provides you the option to include or
exclude cell types, hierarchy levels or clock domains for power optimization.
Tip: You need to use the
power_opt_design command to enable
the power optimization step. The set_power_opt command is used only
for targeting the optimization.The syntax for the set_power_opt command is:
set_power_opt [-include_cells <args>] [-exclude_cells <args>] [-clocks <args>] [-cell_types <args>] [-quiet] [-verbose]| Option Name | Optional | Default | Description |
|---|---|---|---|
-include_cells
|
Yes | All | Include only the listed cells for clock gating |
-exclude_cells
|
Yes | None | Exclude the listed cells from clock gating |
-clocks
|
Yes | All clocks | Clock gate the cells clocked by the listed clocks only |
-cell_types
|
Yes | All | Clock gate the following cell types only:
[all|bram|uram|reg|srl|none]
|
-quiet
|
Yes | N/A | Ignore command errors |
-verbose
|
Yes | N/A | Suspend message limits during command execution |
Examples
The following example sets power optimization for block RAM and REG type cells, then adds SRLs:
set_power_opt -cell_types {bram reg}
set_power_opt -cell_types {srl}The following example sets power optimization for block RAM cells only, then excludes the cpuEngine block from optimization, but then includes the cpuEngine/cpu_dbg_dat_i block:
set_power_opt -cell_types bram
set_power_opt -exclude_cells cpuEngine
set_power_opt -include_cells cpuEngine/cpu_dbg_dat_i