{"id":9816,"date":"2010-12-21T14:12:32","date_gmt":"2010-12-21T14:12:32","guid":{"rendered":"http:\/\/zukenblog.wpengine.com\/?p=1567"},"modified":"2023-05-13T03:52:34","modified_gmt":"2023-05-13T07:52:34","slug":"how-to-implement-signal-integrity-screening-guidelines-for-pcb-designers-part-2","status":"publish","type":"post","link":"https:\/\/www.zuken.com\/us\/blog\/how-to-implement-signal-integrity-screening-guidelines-for-pcb-designers-part-2\/","title":{"rendered":"How to Implement Signal Integrity Screening: Guidelines for PCB Designers: Part 2"},"content":{"rendered":"

This is my second\u00a0of\u00a0two posts that look at why PCB designers should take on more of an active\u00a0role in signal integrity screening and the benefits for the organization – here’s the first part<\/a>.<\/p>\n

Signal Integrity Screening by PCB Designer – but thats more work for ME???<\/h2>\n

Why would you as a PCB designer take on this task of signal integrity<\/a> screening?<\/p>\n

Clearly, I am suggesting adding to your already compressed schedule \u2013 I can\u2019t deny that fact. And by performing this action, we are departing from traditional placement and routing activities.\u00a0But hold on, before you switch off –\u00a0when proposing this action to designers, some have actively told me that they want to increase their value in the design process.\u00a0\u00a0Others desire a better understanding of the effects of their routing choices, and a few totally embraced the idea on its own merits \u2013 the overall time and money savings for the organization.<\/p>\n

Again, you as a PCB designer are best positioned to perform the signal integrity screening, as you are the most intimate with the physical realization, knowing which signal names correspond to which traces.\u00a0 You already have the design environment open and therefore the screening activity simply becomes an extension of what you are already doing \u2013 realizing the PCB.<\/p>\n

You might be wondering, if design tools are so sophisticated in realizing electrical design intent, why would screening need to take place at all?\u00a0 Give me a minute to explain this one. For crosstalk<\/a> or multi-drop nets with min\/max delays (as opposed to lengths), often it is easier to route nets first without considering constraints and then resolve issues using manual or automated methods.\u00a0 Resolving min\/max delay issues requires multiple passes.\u00a0 For the first pass, a faster calculation mode is used to check delay of each branch.\u00a0 Then at screening time, actual simulation is used to incorporate all of the reflections and logic low and high voltage levels.\u00a0 Screening for overshoot is best performed after placement.\u00a0 At this stage, the design is returned to the engineer with nets flagged that require termination.\u00a0 Therefore, signal integrity screening is really a continual process throughout the board layout phase.<\/p>\n

Steps for a PCB Designer to implement\u00a0Signal Integrity (SI) Screening<\/h2>\n

Let us get specific about your actions when performing signal integrity screening using Zuken\u2019s CR-5000 Lightning<\/a> solution as an example.<\/p>\n

Confirm Board Stackup<\/strong>:\u00a0 A first step is for you to confirm the board stackup, ensuring that the materials, thicknesses, and reference planes are correctly established.\u00a0 With this in hand, you create a field solution so that crosstalk and delays can be calculated.\u00a0 In addition, you can assess the characteristic impedance for a set of trace widths or conversely, calculate a set of trace widths based upon specified impedance.\u00a0 A similar process applies to differential signaling, where the variables are trace width, trace-to-trace spacing, and differential impedance.\u00a0 Below is a screenshot of the stackup editor.<\/p>\n

Set-up Default Simulation Models<\/strong>:\u00a0 Ideally, the engineer has assembled SI models for the design that were used when he or she experimented with signaling scenarios prior to schematic capture.\u00a0 In this case, assigning models is straightforward.<\/p>\n

So you don\u2019t operate in an ideal world? Never fear, if this is not the case, you can specify driver\/receiver models that are appropriate for the technology being used.<\/p>\n

Assess Constraints<\/strong>:\u00a0 Next, you assess constraints.\u00a0 Ideally (again that utopian word), the engineer has captured the design\u2019s electrical intent (mV of crosstalk and ps of delay) directly within CR-5000 Lightning<\/a>.\u00a0 In contrast, it may be that the engineer has communicated requirements in documentation; it may be incumbent upon you to enter them.\u00a0 In the absence of specified constraints, for the purposes of SI screening you can constrain the design automatically for crosstalk, overshoot, and stub length based on the rise time of the SI models.<\/p>\n

Configure Analysis and Checking<\/strong>:\u00a0 At this point, you configure how the tool will behave when screening is performed.\u00a0 The default settings are shown below.\u00a0 However, if you also want to assess overshoot, the button for Simulation under Signal Integrity would need to be selected.\u00a0 In the Physical Editor, you specify how crosstalk will be reported when checking is performed.<\/p>\n

Perform Screening and Review the Results in Constraint Manager<\/strong>:\u00a0 After the board has been placed and there is routing to evaluate, you start the screening process.\u00a0 Results are shown in the spreadsheet-based presentation of the Constraint Manager<\/a>.\u00a0 To investigate a net of interest, you use the \u201cUpdate Selected\u201d command.\u00a0 If you choose many nets to review, the color-coded results make it easy to see which nets are in compliance (color green), close to violation (orange) or exceeding the constraint (red).\u00a0 In the crosstalk case, shown below, the contribution of the primary aggressors is included.<\/p>\n

If desired, you can check distortion, as shown here:<\/p>\n

You can also check the impedance of a net based on the layers it traverses.<\/p>\n

Finally, you can check delays.<\/p>\n

Perform Checking and Review the Results in the Physical Editor<\/strong>:\u00a0 You may choose to review the design on the board itself.\u00a0 To do so, you check the nets or the entire board for crosstalk, and then locate the crosstalk with an interactive command that steps through each crosstalk victim.\u00a0 Here is the display that that you would see:<\/p>\n

Resolve Issues and Send Design to the Engineer for Deeper Review<\/strong>:\u00a0 As issues are found, you should resolve them, if possible.\u00a0 When you save the design, any color-coded results will persist in the Constraint Manager window for the engineer to examine more closely.<\/p>\n

Conclusions<\/h2>\n

The practice of creating a high-speed digital design requires that both agents, the electrical engineer and the PCB designer, work even more closely.<\/p>\n

The engineer needs to delve into matters that have typically concerned only the designer, such as stackup, trace widths, and spacings, in order to yield the desired characteristic single-ended and differential pair impedances.<\/p>\n

You as the designer need to understand that routing for delay is different from routing for length and that signals with faster edge rates create more crosstalk than those with slower edge rates.\u00a0 With that in mind and armed with the proper tools, the designer who performs signal integrity screening during layout significantly improves the overall design process.<\/p>\n

You address simple SI issues earlier, freeing up the engineer to focus on tougher problems.\u00a0 This practice can minimize the need for rework and reduce the number of large SI review cycles needed.<\/p>\n

All of this means that the product can be delivered earlier with higher quality, thereby saving time and money.<\/p>\n

I have used Zuken’s CR-5000 Lightning <\/a>high-speed design solution to illustrate all the points in this series of blog posts. If you click on this link, you can also download more high-speed design articles<\/a> from the resulting web page on Zuken.com.<\/p>\n

Additionally if you would like some help with your\u00a0Signal Integrity Processes<\/a>, take a look at the Consultancy services offered by Zuken in\u00a0this area.<\/p>\n

If you have any questions on signal integrity screening, feel free to\u00a0post a comment below and I’ll get right back to you.<\/p>\n","protected":false},"excerpt":{"rendered":"

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Others desire a better understanding of the effects of their routing choices, and a few totally embraced the idea on its own merits \u2013 the overall time and money savings for the organization.\t\t<\/p>\n","protected":false},"author":30,"featured_media":11075,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[226,228],"tags":[232,241],"class_list":["post-9816","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to","category-pcb-design","tag-cr-5000-lightning","tag-signal-integrity"],"acf":[],"yoast_head":"\nGuidelines for PCB Designers: Signal Integrity Screening - Zuken Blog<\/title>\n<meta name=\"description\" content=\"This is my second\u00a0of\u00a0two posts that look at why PCB designers should take on more of an active\u00a0role in signal integrity screening 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