关于PVT
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本文针对常见的PVT问题,做深入的分析和总结
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PVT属于时序设计中的基本问题,属于必须掌握的知识点
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希望对大家的面试和工作有帮助
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跟多交流可联系个人微信号(xgcl_wei)进行进一步沟通学习
影响时序的因素
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Apply environmental attributes to model the timing effects of:
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Input drivers and transitiontimes
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Capacitive output loads
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PVT operatingconditions or ‘corners’
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Interconnect parasitic RCs
Modeling PVT Effects
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Case Two:
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Multiple Lib Files, No Op. Cond’s
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Three lib file released forwccom/ norminal / bccom
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In your .synopsys_dc.setupfile, enter:
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set target_libraryXvendor_90nm_wccom.db
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set link_library “* Xvendor_90nm_wccom.db”
Modeling PVT effects
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Case Three:
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Multiple Files with OperatingCond’s
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Three lib files released forwccom/norminal/bccom
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In your .synopsys_dc.setup fileand constraint file, enter:
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set target_libraryvendorX90nm_slow_proc.db
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set link_library “*vendorX90nm_slow_proc.db”
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set_operating_conditions -max “WCCOM”
PVT总结
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针对厂家提供的工艺参数文件,要及时沟通和更新;
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一般来说,厂家会提供推荐流程(相对保守);
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通过流片的积累,丰富自己在相关厂商的流片经验,适当调整约束策略和条件,使良率达到最优;
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一个公司ASIC水平的高低,实际上体现在对厂家PVT信息资料的把握和积累上。