get_tmrt.md

get_tmrt

This is an update function!

Purpose

The purpose of this function is ensure consistency when querying for the value of the tmrt attribute. Furthermore, this function requires fewer arguments than using get_attribute (a built-in command).

Usage

Whenever the tmrt attribute is needed, this function is called; when triplicating the return value of this function dictates whether or not triplication will occur.

Definition

proc get_tmrt { element } {
    ###############################################################
    # replaces the need for 'redirect -variable..'
    #
    # input:  any cell/port/pin/register
    # output: return the value of the tmrt attribute of the element,
    #         will return -1 if tmrt is not set
    ###############################################################

    # retrieve tmrt attribute
    set tmrt [get_synopsys_value "get_attribute -quiet -return_null_values $element tmrt"]

    # check if tmrt is boolean, return -1 if not
    if {[string is boolean $tmrt] && [string length $tmrt] > 0} {
        return $tmrt
    } else {
        return -1
    }
}

This function will only work, if the following function is sourced:

• get_synopsys_value

Example

Given the incomplete design in the figure below, calling get_tmrt on some elements will yield:

>> get_tmrt IN
false
>> get_tmrt inst0
false
>> get_tmrt inst0/IN_A
true
>> get_tmrt des0_A
true
>> get_tmrt des0_A/IN
false

The text marked in orange marks triplicated elements.