Get a list of speed_models in the device.
Syntax
get_speed_models [‑of_objects <args>] [‑regexp] [‑nocase] [‑patterns <arg>]
[‑filter <arg>] [‑speed_pattern <arg>] [‑quiet] [‑verbose]
Returns
speed_models
Usage
Name | Description |
---|---|
[-of_objects]
|
Get 'speed_model' objects of these types: 'node bel pip cell'. |
[-regexp]
|
Patterns are full regular expressions |
[-nocase]
|
Perform case-insensitive matching. (valid only when -regexp specified) |
[-patterns]
|
Match the 'speed_model' objects against patterns. Default: * |
[-filter]
|
Filter list with expression |
[-speed_pattern]
|
Returns a single model that exactly matches the pattern. |
[-quiet]
|
Ignore command errors |
[-verbose]
|
Suspend message limits during command execution |
Description
Get speed models for UltraScale architecture device resources in the current design.
Speed files are provided by Xilinx for each device and speed grade. Speed files contain speed models. There are speed models for the various elements of a device: nodes, pips, bels. There are speed models for setup and hold, propagation delays, jitter, etc.
The speed models include information on the delays in nanoseconds (ns) associated with device resources like BELs and SITEs and routing resources. Speed models are used by the Vivado timing engine to perform analysis of the current design in the context of the target part.
The objects returned are the speed models associated with specific physical resources like pips and wires, drawn directly from the speed files. These can include capacitance and resistance values and buffer models.
get_*
commands return a container list of a single type of objects (e.g. cells, nets, pins, or ports). You can add new objects to the list (using lappend
for instance), but you can only add the same type of object that is currently in the list. Adding a different type of object, or string, to the list is not permitted and will result in a Tcl error.
This command returns the specified speed model objects, or returns an error if the command fails.
Arguments
-regexp
- (Optional) Specifies that the search <patterns> are written as regular expressions. Both search <patterns> and -filter
expressions must be written as regular expressions when this argument is used. Xilinx regular expression Tcl commands are always anchored to the start of the search string. You can add ".*" to the beginning or end of a search string to widen the search to include a substring. See http://perldoc.perl.org/perlre.html for help with regular expression syntax.
regexp
is not anchored, and works as a standard Tcl command. For more information refer to http://www.tcl.tk/man/tcl8.5/TclCmd/regexp.htm.
-nocase
- (Optional) Perform case-insensitive matching when a pattern has been specified. This argument applies to the use of -regexp
only.
-filter
<args> - (Optional) Filter the results list with the specified expression. The -filter
argument filters the list of objects returned by get_speed_models
based on property values on the objects. You can find the properties on an object with the report_property
or list_property
commands. In the case of the speed_model object, "NAME", "TYPE" and "DELAY" are some of the properties that can be used to filter results.
get_pins * -filter {DIRECTION == IN && NAME !~ "*RESET*"}
bool
) type properties can be directly evaluated in filter expressions as true or not true: -filter {IS_PRIMITIVE && !IS_LOC_FIXED}
-of_objects
<arg> - (Optional) Get the speed models for the specified node, bel, pip, or cell objects.
-of_objects
option requires objects to be specified using the get_*
commands, such as get_cells
or get_pins
, rather than specifying objects by name. In addition, -of_objects
cannot be used with a search <pattern>.
-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
report_property -all [lindex [get_speed_models -of \
[get_bels SLICE_X0Y0/A6LUT]] 0]
Property Type Read-only Value
CLASS string true speed_model
DELAY double true 0.043
FAST_MAX double true 0.035
FAST_MIN double true 0.028
IS_INSTANCE_SPECIFIC bool true 1
NAME string true bel_d_lut6_a1_o6
NAME_LOGICAL string true bel_d_lut6_a1_o6
SLOW_MAX double true 0.043
SLOW_MIN double true 0.036
SPEED_INDEX int true 65535
TYPE string true bel_delay
set x [get_speed_models -of [get_bels SLICE_X0Y0/A6LUT]]
puts [format "%6.3f : %s" [get_property DELAY [lindex $x 0 ]] \
[get_property NAME [lindex $x 0 ]]]