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硬件工程师在硬件开发中要注意的事项

原始驱动力来自市场需求、基于整个系统架构、应用软件部门功能实现需求、提高系统能力等多个方面,因此作为硬件系统设计师,积极了解各方面的需求,综合提出最合适的硬件解决方案。A该项目的原始驱动力来自公司内部的一个高级软件团队,他们实际上发现了原来的处理器板IP转发能力不能满足要求,会给系统的配置和使用带来很大的不便,因此对新硬件提出了要求。根据这一目标,硬件方案选择了两个高性能的网络处理器,然后需要与软件设计师进行深入的沟通,以确定内存大小、内部结构、外部接口和调试接口的数量和类型,如软件人员喜欢完全分离控制信通道和数据通道,以便在确定内部数据方向时仔细考虑。在项目开始时,需要召开大量的讨论会议。我们应该尽量邀请所有相关部门参加。有三个好处。首先,我们可以充分了解每个人的需求,避免在系统设计中错过重要功能。二是让各部门了解项目情况,提前做好时间和人员合作的准备,三是在情感方面,各部门在设计开始时参与,这个项目已经成为大家共同努力的结晶,会得到大家的关心和良好的合作,对完成工作很有帮助。 原理图设计应该有“拿来主义”,现在芯片厂家一般都能提供参考设计的原理图,所以要尽量利用这些资源,

在充分理解参考设计的基础上,做一些自己的游戏。当选择主芯片时,最关键的外围设计包括电源、时钟和芯片之间的连接。 电源是保证硬件系统正常运行的基础,设计应详细分析:系统可提供的电源输入;单板所需的电源输出;

各电源所需的电流大小、电源电路效率、各电源允许的波动范围、整个电源系统所需的上电顺序等。

比如A网络处理器络处理器需要1.25V要求精度为+作为核心电压5%- -3%之间,需要电流12A根据这些要求,

设计中采用5V输入和利用电源Linear开关电源控制器和IR的MOSFET建立合适的电源供应电路,精度要求决定输出电容ESR选择,

并增加了远端反馈功能,以防止电流过大导致电压下降。   时钟电路的实现要考虑到目标电路的抖动等要求,A项目中用到了GE的PHY器件,

刚开始的时候使用一个内部带相环的零延时时钟分配芯片提供100MHz时钟,结果GE链路上出现了丢包,后来换成简单的时钟Buffer器件就解决了丢包问题,分析起来就是内部的锁相环引入了抖动。   芯片之间的互连要保证数据的无误传输,在这方面,高速的差分信号线具有速率高,好布线,信号完整性好等特点,A项目中的多芯片间互连均采用了高速差分信号线,在调试和测试中没有出现问题。      PCB设计中要做到目的明确,对于重要的信号线要非常严格的要求布线的长度和处理地环路,而对于低速和不重要的信号线就可以放在稍低的布线优先级上。重要的部分包括:电源的分割;内存的时钟线,控制线和数据线的长度要求;高速差分线的布线等等。   A项目中使用内存芯片实现了1G大小的DDR memory,针对这个部分的布线是非常关键的,要考虑到控制线和地址线的拓扑分布,数据线和时钟线的长度差别控制等方面,在实现的过程中,根据芯片的数据手册和实际的工作频率可以得出具体的布线规则要求,比如同一组内的数据线长度相差不能超过多少个mil,每个通路之间的长度相差不能超过多少个mil等等。当这些要求确定后就可以明确要求PCB设计人员来实现了,如果设计中所有的重要布线要求都明确了,可以转换成整体的布线约束,利用CAD中的自动布线工具软件来实现PCB设计,这也是在高速PCB设计中的一个发展趋势。      当准备调试一块板的时候,一定要先认真的做好目视检查,检查在焊接的过程中是否有可见的短路和管脚搭锡等故障,检查是否有元器件型号放置错误,第一脚放置错误,漏装配等问题,然后用万用表测量各个电源到地的电阻,以检查是否有短路,这个好习惯可以避免贸然上电后损坏单板。调试的过程中要有平和的心态,遇见问题是非常正常的,要做的就是多做比较和分析,逐步的排除可能的原因,要坚信“凡事都是有办法解决的”和“问题出现一定有它的原因”,这样最后一定能调试成功。      现在从技术的角度来说,每个设计最终都可以做出来,但是一个项目的成功与否,不仅仅取决于技术上的实现,还与完成的时间,产品的质量,团队的配合密切相关,所以良好的团队协作,透明坦诚的项目沟通,精细周密的研发安排,充裕的物料和人员安排,这样才能保证一个项目的成功。   一个好的硬件工程师实际上就是一个项目经理,他/她需要从外界交流获取对自己设计的需求,然后汇总,分析成具体的硬件实现。还要跟众多的芯片和方案供应商联系,从中挑选出合适的方案,当原理图完成后,他/她要组织同事来进行配合评审和检查,还要和CAD工程师一起工作来完成PCB的设计。与此同时,还要准备好 BOM清单,开始采购和准备物料,联系加工厂家完成板的贴装。在调试的过程中他/她要组织好软件工程师来一起攻关调试,配合测试工程师一起解决测试中发现的问题,等到产品推出到现场,如果出现问题,还需要做到及时的支持。所以做一个硬件设计人员要锻炼出良好的沟通能力,面对压力的调节能力,同一时间处理多个事务的协调和决断能力和良好平和的心态等等。   还有细心和认真,因为硬件设计上的一个小疏忽往往就会造成非常大的经济损失,比如以前碰到一块板在PCB设计完备出制造文件的时候误操作造成了电源层和地层连在了一起,PCB板制造完毕后又没有检查直接上生产线贴装,到测试的时候才发现短路问题,但是元器件已经都焊接到板上了,结果造成了几十万的损失。所以细心和认真的检查,负责任的测试,不懈的学习和积累,才能使得一个硬件设计人员持续不断的进步,而后术业有所小成。

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