请问tetramax中的add_nofaults到底是什么意思？谢谢～

appleyuchi2

请问tetramax中的add_nofaults到底是什么意思？谢谢～
下面是说明文档，看不懂什么意思，既然是no faults，还用得着add吗？
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add_nofaults
[<instance_name> | <pin_pathname>  | -module <module_name>]
[-stuck <0 | 1 | 01>] [-instance {instance_name_list}]

                        

---

                                
                    Arguments            

instance_name

            

Adds the nofault attribute to all faults associated with the hierarchical [url=]instancepathname.[/url]

            

pin_pathname [-stuck <0 | 1 | 01>]

            

Adds the nofault attribute to faults on the [url=]pinpathname.[/url] You can use the -stuck option to select either stuck 0, stuck 1, or both. The default isboth stuck 0 and stuck 1. A stuck 0/1/01 nofault also blocks the creation of any slow-to-rise/fall/rise&fallfaults or IDDQ faults at the specified site.

            

-module <module_name> [-stuck <0 | 1 | 01>]

            

Adds the nofault attribute to one or more pins of every instantiation of a given module, where <name> could be a fixed string or a [url=]limitedregular expression[/url]. If no pins are specified, then all pins of the module are used. The -stuck option may be used to select either stuck 0, stuck 1, or both. The default is both stuck 0 and stuck 1.

            

-instance {instance_name_list}

            

Adds the nofault attribute to all faults specified in the instance_name_list.

            Allowed Command Modes            

DRC, Test

            Description            

Use this command to inhibit the placement of faults at specific locations. You must define nofaults priorto using the [url=]addfaults[/url] or [url=]readfaults[/url] command to inhibit adding a fault to selected locations. You can use the [url=]addequivalent nofaults[/url] command to set the nofault attribute for all faults that are equivalent tofaults that currently have the nofault attribute.

            Examples            

                 # nofault stuck-at-1 fault of pin 'SL' of every instance
# of module MUX2H
TEST> add_nofaults -module MUX2H -stuck 1 SL
  4 faults were added to nofault list.

            

                 # nofault a specific pin
TEST> add_nofaults mux3/MUX2_UDP_1/Q
  2 faults were added to nofault list.

            

                 # nofault an instance
TEST> add_nofaults mux0
  15 faults were added to nofault list.

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