set_operating_conditions - 2024.1 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

Document ID
UG835
Release Date
2024-05-30
Version
2024.1 English

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

Categories

SDC, XDC, Power

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.

Note: This command operates silently and does not return direct feedback of its operation.

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}

Note: If you specify a voltage that is outside the valid operating range for the target device, the 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.
Note: Any errors encountered on the command-line, while launching the command, will be returned. Only errors occurring inside the command will be trapped.
-verbose - (Optional) Temporarily override any message limits and return all messages from this command.
Note: Message limits can be defined with the 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 75

The 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 maximum

The 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}