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engineering change order wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 usage and contents 2 chip design 3 telecommunications industry 4 references toggle the table of contents engineering change order 1 language 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia engineering concept this article needs more citations please help improve this article by adding citations to reliable sources unsourced material may be challenged and removed find sources engineering change order news newspapers books scholar jstor june 2012 learn how and when to remove this message an engineering change order eco also called an engineering change notice ecn engineering change ec or engineering release notice ern is an artifact used to implement changes to components or end products the eco is utilized to control and coordinate changes to product designs that evolve over time the need for an engineering change may be triggered by a number of events and varies by industry typical engineering change categories are product evolution a change resulting in applying an existing part to a new application and maintaining backwards compatibility cost reduction a change resulting in lower overall cost to produce or maintain product performance a change that improves the capabilities of the item safety a change required to enhance the safety to those using or interacting with the item usage and contents edit eco rework a pair of resistors are soldered to the back of a pci card an eco is defined as a document approved by the design activity that describes and authorizes the implementation of an engineering change to the product and its approved configuration documentation 1 in product development the need for change is caused by correction of a design error that doesn t become evident until testing and modeling or customer use reveals it a change in the customers requirements necessitating the redesign of part of the product a change in material or manufacturing method this can be caused by a lack of material availability a change in vendor or to compensate for a design error an eco must contain at least this information 2 identification of what needs to be changed this should include the part number and name of the component and reference to the drawings that show the component in detail or assembly reason s for the change description of the change this includes a drawing of the component before and after the change generally these drawings are only of the detail affected by the change list of documents and departments affected by the change the most important part of making a change is to see that all pertinent groups are notified and all documents updated approval of the change as with the detail and assembly drawings the changes must be approved only by those individuals that are authorized to approve such a document typically a number of individuals approve changes related to their own speciality with a final overall approval from management instruction about when to introduce the change immediately scrapping current inventory during the next production run or at some other milestone 3 chip design edit in chip design eco is the process of inserting a logic change directly into the netlist after it has already been processed by an automatic tool before the chip masks are made ecos are usually done to save time by avoiding the need for full asic logic synthesis technology mapping place route layout extraction and timing verification eda tools are often built with incremental modes of operation to facilitate this type of eco after masks have been made ecos may be done to save money if a change can be implemented by modifying only a few of the layers typically metal then the cost is much less than it would be if the design was re built from scratch this is because starting the process from the beginning will almost always require new photomasks for all layers and each of the 20 or so masks in a modern semiconductor fabrication process is quite expensive a change implemented by modifying only a few layers is typically called a metal mask eco or a post mask eco designers often sprinkle a design with unused logic gates and eda tools have specialized commands to make this process easier one of the most common ecos in asic design is the gate level netlist eco in this flow engineers manually and often tediously hand edit the gate level netlist instead of re running logic synthesis the netlist files have to be searched for the logic affected by the change the files need to be edited to implement the changes up and down the hierarchy and the changes need to be tracked and verified to make sure exactly what needs to change gets changed and nothing more this is a very time and resource intensive process that is easily subject to errors therefore formal equivalence checking is normally used after ecos to ensure the revised implementation matches the revised specification with time to market pressures and rising mask costs in the semiconductor industry several electronic design automation eda companies are beginning to bring more automation into the eco implementation process most popular place and route products have some level of built in eco routing to help with implementing physical level ecos cadence design systems has recently announced a product called conformal eco designer that automates the creation of functional ecos usually the most tedious process in implementing an eco it uses formal equivalence checking and logic synthesis techniques to produce a gate level eco netlist based on the changed rtl synopsys in the past had a product called eco compiler that is now defunct synopsys now has primetime eco for dealing with ecos 4 tweaker f1 tweaker t1 have also come into the limelight in the recent dac 2012 for their eco algorithms 5 telecommunications industry edit the telecommunications industry has a formal process that takes elements of the eco and other considerations and combines them into the product change notice pcn after telecommunications products have been generally available and or in service for a period of time it often becomes necessary for suppliers to introduce changes to those products as a result of implementing these changes regardless of who performs the actual work the telecommunications carriers are significantly impacted with respect to labor and resources etc thus it is imperative that changes to these products are accurately reported and tracked through completion according to the needs and requirements of the carriers the term product change includes changes to hardware software and firmware that occur over the entire life of a product product changes include those considered reportable and non reportable these changes may be applied by a supplier a customer or a contractor retained by the customer depending on negotiated agreements fundamentally the customer s goal is to ensure there is a process by which there is accurate and efficient tracking and reporting of changes to products changes are considered reportable when they affect the performance or life span of a product such changes include any that affect the form fit function or the product technical specification i e documentation of the product the desire for supplier or customer traceability may result in a reportable change the entire pcn process is documented in gr 209 issue 6 generic requirements for product change notices pcns references edit buckley fletcher j 1996 implementing configuration management hardware software and firmware 2nd edition ieee ullman david g 2009 the mechanical design process mc graw hill 4th edition a free word template with fields for this information is available associated with ullman archived from the original on 2017 07 19 retrieved 2018 03 27 signoff driven eco guidance for faster timing closure retrieved 2012 06 02 cite web cs1 maint deprecated archival service link synopsys mentor cadence tsmc globalfoundries snps ment cdns archived from the original on 2013 02 01 retrieved from https en wikipedia org w index php title engineering_change_order oldid 1356559548 categories engineering concepts electronic design automation hidden categories articles with short description short description matches wikidata articles needing additional references from june 2012 all articles needing additional references cs1 maint deprecated archival service this page was last edited on 28 may 2026 at 14 26 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents engineering change order 1 language add topic