[OpenOMAP] 关于openOmap carrier 上面的DM9000's IRQ

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Riwen Huang

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May 5, 2010, 2:46:28 AM5/5/10
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我看到openOmap carrier上面的DM9000的IRQ是通过245转换电平的。 

在OmapZoomII参考上面有个注释:IRQ MUST setup as Open-Drain
对这些电气细节不熟悉,请问245能满足这个条件吗? 

devkit8k的这个irq线是通过sn74lvc2g07来转换的。


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Yanjun Luo

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May 5, 2010, 2:50:36 AM5/5/10
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可以的。随便哪个电平转换芯片应该都可以的。


在 2010-05-05三的 14:46 +0800,Riwen Huang写道:
> 我看到openOmap carrier上面的DM9000的IRQ是通过245转换电平的。
>
>
> 在OmapZoomII参考上面有个注释:IRQ MUST setup as Open-Drain
> 对这些电气细节不熟悉,请问245能满足这个条件吗?
>
>
> devkit8k的这个irq线是通过sn74lvc2g07来转换的。
>
>
>
>
>
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Riwen Huang

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May 6, 2010, 9:13:15 PM5/6/10
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请问核心板上,tps69530出来的nRESPWRON, 
为什么要经过SN74LVC2G07DCKR转换,才传给CPU和其他芯片的RESET(nRest/SYS_nRESPWRON)?

Yanjun Luo

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May 6, 2010, 9:51:32 PM5/6/10
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那就是最普通的buffer用法啊。

在 2010-05-07五的 09:13 +0800,Riwen Huang写道:
> 请问核心板上,tps69530出来的nRESPWRON,
> 为什么要经过SN74LVC2G07DCKR转换,才传给CPU和其他芯片的
> RESET(nRest/SYS_nRESPWRON)?

Riwen Huang

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May 6, 2010, 10:09:05 PM5/6/10
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我以为buffer一般是做电平转换的,这个不都是1.8V吗? TPS和OMAP3 reset不都是1.8V吗?

Yanjun Luo

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May 6, 2010, 10:16:28 PM5/6/10
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兄弟,buffer最主要的功能不是电平转换,是增强驱动能力!

电平转换不过是附带的功能而已。


在 2010-05-07五的 10:09 +0800,Riwen Huang写道:
> 我以为buffer一般是做电平转换的,这个不都是1.8V吗? TPS和OMAP3 reset不
> 都是1.8V吗?

Riwen Huang

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May 6, 2010, 10:28:33 PM5/6/10
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学习了,非常感谢。 太业余啦。 
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