Set operating conditions for power estimation
Syntax
set_operating_conditions [‑voltage <args>] [‑grade <arg>] [‑process <arg>]
[‑junction_temp <arg>] [‑ambient_temp <arg>] [‑thetaja <arg>]
[‑thetasa <arg>] [‑airflow <arg>] [‑heatsink <arg>] [‑thetajb <arg>]
[‑board <arg>] [‑board_temp <arg>] [‑board_layers <arg>]
[‑design_power_budget <arg>] [‑supply_current_budget <args>] [‑quiet]
[‑verbose]Usage
| Name | Description |
|---|---|
[-voltage]
|
List of voltage pairs, e.g., {name value}. Supported voltage supplies vary by family. |
[-grade]
|
Temperature grade. Supported values vary by family. Default: commercial |
[-process]
|
Process data: typical or maximum Default: typical |
[-junction_temp]
|
Junction Temperature (C): auto|degC Default: auto |
[-ambient_temp]
|
Ambient Temperature (C): default|degC Default: default |
[-thetaja]
|
ThetaJA (C/W): auto|degC/W Default: auto |
[-thetasa]
|
ThetaSA (C/W): auto|degC/W Default: auto |
[-airflow]
|
Airflow (LFM): 0 to 750 Default: varies by family |
[-heatsink]
|
Dimensions of heatsink: none, low, medium, high, custom Default: medium |
[-thetajb]
|
ThetaJB (C/W): auto|degC/W Default: auto |
[-board]
|
Board type: jedec, small, medium, large, custom Default: medium |
[-board_temp]
|
Board Temperature degC |
[-board_layers]
|
Board layers: 4to7, 8to11, 12to15, 16+ Default: 8to11 |
[-design_power_budget]
|
Design Power Budget (W) Default: Unspecified |
[-supply_current_budget]
|
Sets list of supply current budget 'name value' pairs. Supported voltage supplies vary by family. |
[-quiet]
|
Ignore command errors |
[-verbose]
|
Suspend message limits during command execution |
Description
Sets the real-world operating conditions that are used when performing analysis of the design. The environmental operating conditions of the device are used for power analysis when running the report_power command.
Operating conditions can be restored to their default values with the use of the reset_operating_conditions command.
Current operating conditions can be reported with the report_operating_conditions command.
Arguments
-voltage <arg> - (Optional) List of voltage supply names and their values specified in pairs. Supported voltage supply names and their values vary by family. For example if a family supports a voltage supply named Vccint, you can set the supply voltage to 0.8 with the following argument and value: -voltage {Vccint 0.8}
set_operating_conditions command can change the device speedgrade to match the specified voltage. This can have an affect on timing analysis. For UltraScale™ devices, when changing the Vccint voltage, the Vivado™ tool will automatically change the device to or from a low-voltage device as indicated by the voltage level specified.
-grade <arg> - (Optional) The temperature grade of the target device. Supported values vary by family. The default value is "commercial".
-process <arg> - (Optional) The manufacturing process characteristics to assume. Valid values are "typical" or "maximum". The default value is "typical".
-junction_temp <arg> - (Optional) The device junction temperature used for modeling. Valid values are "auto" or an actual temperature specified in degrees C. The default value is "auto".
-ambient_temp <arg> - (Optional) The environment ambient temperature in degrees C. The default setting is "default".
-thetaja <arg> - (Optional) The Theta-JA thermal resistance used for modeling in degrees C/W. The default setting is "auto".
-thetasa <arg> - (Optional) The Theta-SA thermal resistance used during modeling in degrees C/W. The default setting is "auto".
-airflow <[0:750]> - (Optional) Linear Feet Per Minute (LFM) airflow to be used for modeling. The default setting varies by device family.
-heatsink <arg> - (Optional) The heatsink profile to be used during modeling. Valid values are: none, low, medium, high, custom. The default setting is "medium".
-thetajb <arg> - (Optional) The Theta-JB thermal resistance used for modeling in degrees C/W. The default setting is "auto".
-board <arg> - (Optional) The board size to be used for modeling. The valid values are: jedec, small, medium, large, custom. The default value is "medium".
-board_temp <arg> - (Optional) The board temperature in degrees Centigrade to be used for modeling.
-board_layers <arg> - (Optional) The number of board layers to be used for modeling. Valid values are: "4to7" for boards with 4 to 7 layers, "8to11" for boards with 8 to 11 layers, "12to15" for boards with 12 to 15 layers, and "16+" for boards with 16 or more layers. The default setting is "12to15".
-design_power_budget <arg> - (Optional) The design power budget in Watts. This value is used by the report_power command to report the difference between the calculated on-chip power and the design power budget. When unspecified, the difference is not reported. The default is "unspecified".
-supply_current_budget <arg> - (Optional) List of voltage supply names and their current budget values specified in pairs. Supported voltage supply names vary by family. For example if a family supports a voltage supply named Vccint, you can set the supply current budget to 10 A with the following argument and value: -supply_current_budget {Vccint 10}
-quiet - (Optional) Execute the command quietly, returning no messages from the command. The command also returns TCL_OK regardless of any errors encountered during execution.
-verbose - (Optional) Temporarily override any message limits and return all messages from this command.
set_msg_config command.Examples
The following example specifies an industrial grade device with an ambient operating temperature of 75 degrees C:
set_operating_conditions -grade industrial -ambient_temp 75The following example sets the supply voltage Vccaux to a value of 1.9:
set_operating_conditions -voltage {Vccaux 1.89}The following example sets the manufacturing process corner to maximum:
set_operating_conditions -process maximumThe following example sets the manufacturing process corner to maximum and the voltage supply Vccint to 0.875:
set_operating_conditions -process maximum -voltage {Vccint 0.875}