set_operating_conditions - 2020.2 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

Document ID
UG835
Release Date
2020-11-18
Version
2020.2 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}