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我找到了一个ML605板的项目,有这个IDELACTRL: IDELAYCTRL dlyctrl(.RDY(),. REFCLK(refclk_bufg),. RST(idelayctrl_reset)); SPARTAN-6 FPGA不支持。 我应该用什么呢? 谢谢! 以上来自于谷歌翻译 以下为原文 Hi! I found a project for a ML605 board in wich there is this IDELACTRL: IDELAYCTRL dlyctrl ( .RDY (), .REFCLK (refclk_bufg), .RST (idelayctrl_reset) ); that is not supported in SPARTAN-6 FPGA. What shall I use instead? Thank you! |
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2个回答
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没有...
但你必须明白,Virtex和Spartan-6中的IDELAY / ODELAY之间存在显着差异。 在Virtex器件中(至少从Virtex-5开始 - 甚至可能是Virtex-4,我忘了)和7系列,IDELAY都经过校准。 这意味着每个可编程抽头的大小根据提供给IDELAYCTRL的参考时钟动态调整为固定的时间量 - 标称值为tREFCLK / 64(对于200MHz REFCLK约为78ps)。 在Spartan-6中,IDELAY分接头未经过校准,可以在很宽的范围内变化(基本上是硅器件在工艺,温度和电压方面的正常3:1变化)。 因此,在Virtex中实现使用校准的IDELAY / ODELAY实现高速接口的设计需要非常仔细地检查,以便将其移植到Spartan,并且根据边距,甚至可能不可能 以相同的比特率做。 Avrum 在原帖中查看解决方案 以上来自于谷歌翻译 以下为原文 Nothing... But you have to understand that there is a significant difference between the IDELAY/ODELAY in Virtex and in Spartan-6. In Virtex devices (at least from Virtex-5 on - maybe even Virtex-4, I forget), and the 7 series, the IDELAY is calibrated. This means that the size of each programmable tap is dynamically adjusted to be a fixed amount of time based on the reference clock provided to the IDELAYCTRL - with the nominal value of tREFCLK/64 (around 78ps for a 200MHz REFCLK). In the Spartan-6, the IDELAY taps are not calibrated and can vary over a very wide range (basically the normal 3:1 variation of silicon devices over process, temperature and voltage). Therefore, a design that was implemented in a Virtex to implement a high speed interface using the calibrated IDELAY/ODELAY will need to be examined very carefully in porting it to a Spartan, and, depending on the margins, it may not even be possible to do at the same bitrate. Avrum View solution in original post |
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没有...
但你必须明白,Virtex和Spartan-6中的IDELAY / ODELAY之间存在显着差异。 在Virtex器件中(至少从Virtex-5开始 - 甚至可能是Virtex-4,我忘了)和7系列,IDELAY都经过校准。 这意味着每个可编程抽头的大小根据提供给IDELAYCTRL的参考时钟动态调整为固定的时间量 - 标称值为tREFCLK / 64(对于200MHz REFCLK约为78ps)。 在Spartan-6中,IDELAY分接头未经过校准,可以在很宽的范围内变化(基本上是硅器件在工艺,温度和电压方面的正常3:1变化)。 因此,在Virtex中实现使用校准的IDELAY / ODELAY实现高速接口的设计需要非常仔细地检查,以便将其移植到Spartan,并且根据边距,甚至可能不可能 以相同的比特率做。 Avrum 以上来自于谷歌翻译 以下为原文 Nothing... But you have to understand that there is a significant difference between the IDELAY/ODELAY in Virtex and in Spartan-6. In Virtex devices (at least from Virtex-5 on - maybe even Virtex-4, I forget), and the 7 series, the IDELAY is calibrated. This means that the size of each programmable tap is dynamically adjusted to be a fixed amount of time based on the reference clock provided to the IDELAYCTRL - with the nominal value of tREFCLK/64 (around 78ps for a 200MHz REFCLK). In the Spartan-6, the IDELAY taps are not calibrated and can vary over a very wide range (basically the normal 3:1 variation of silicon devices over process, temperature and voltage). Therefore, a design that was implemented in a Virtex to implement a high speed interface using the calibrated IDELAY/ODELAY will need to be examined very carefully in porting it to a Spartan, and, depending on the margins, it may not even be possible to do at the same bitrate. Avrum |
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