嗨,劳尔,
请在下面找到我的评论
Q1)我们可以推断出,ODT输入为75欧姆,这对信号完整性没有显著影响吗?
是的。
Q2)在图39的第2页第23页,这是否意味着我们必须在WPS/RPS控制信号CP/CPYN和地址总线上设置强制终端电阻,因为没有ODT信号?
是的,你的理解是正确的。
Q3)如果我们在这一点上没有损失任何东西,我们已经想到了一个可能的解决方案来克服我们的问题,在布局上的影响最小:
设置RQ=250欧姆
设置ODT pin Low,所以ODT信号在75欧姆。
如果地址和其他ODT信号必须用一个上拉电阻(50欧姆)终止到VTT,使用VTT终端调节器(例如NCP51400 HTTP://www. OnMy.COM/PUB/PrAUTALAL/NCP51400 D.PDF或另一个),然后将0201个50欧姆电阻器靠近Fanout vias。
这个解决方案能有效吗?否则还有什么选择?
这个解决方案会好的。
谢谢和问候,
普拉迪普塔
以上来自于百度翻译
以下为原文
Hi Raul,
Please find my comments below
Q1) Can we infer here that the ODT inputs are at 75 Ohm and this does not have remarkable effect in signal integrity?
Ans) Yes.
Q2) Following figure 39 at page 23 of [2], does this implies that we have to put mandatory termination resistors at WPS/RPS control signals, CP/CP_N, and address bus because there aren't ODT signals?
Ans) Yes, your understanding is correct.
Q3) If we didn't loss anything at this point, we have thought a possible solution to overcome our problem with minimal impact in layout:
Set RQ = 250 Ohm
Set ODT pin Low, so ODT signals at 75 Ohm.
if Address and other ODT signals must be terminated with a pull up resistor (50 Ohm) to VTT, use a VTT termination regulator (for example NCP51400
http://www.onsemi.com/pub/Collateral/NCP51400-D.PDF or another one), and then place 0201 50 Ohm resistors close to Fanout vias.
can be this solution effective? otherwise what are the alternatives?
Ans) This solution will be okay.
Thanks and Regards,
Pradipta.
嗨,劳尔,
请在下面找到我的评论
Q1)我们可以推断出,ODT输入为75欧姆,这对信号完整性没有显著影响吗?
是的。
Q2)在图39的第2页第23页,这是否意味着我们必须在WPS/RPS控制信号CP/CPYN和地址总线上设置强制终端电阻,因为没有ODT信号?
是的,你的理解是正确的。
Q3)如果我们在这一点上没有损失任何东西,我们已经想到了一个可能的解决方案来克服我们的问题,在布局上的影响最小:
设置RQ=250欧姆
设置ODT pin Low,所以ODT信号在75欧姆。
如果地址和其他ODT信号必须用一个上拉电阻(50欧姆)终止到VTT,使用VTT终端调节器(例如NCP51400 HTTP://www. OnMy.COM/PUB/PrAUTALAL/NCP51400 D.PDF或另一个),然后将0201个50欧姆电阻器靠近Fanout vias。
这个解决方案能有效吗?否则还有什么选择?
这个解决方案会好的。
谢谢和问候,
普拉迪普塔
以上来自于百度翻译
以下为原文
Hi Raul,
Please find my comments below
Q1) Can we infer here that the ODT inputs are at 75 Ohm and this does not have remarkable effect in signal integrity?
Ans) Yes.
Q2) Following figure 39 at page 23 of [2], does this implies that we have to put mandatory termination resistors at WPS/RPS control signals, CP/CP_N, and address bus because there aren't ODT signals?
Ans) Yes, your understanding is correct.
Q3) If we didn't loss anything at this point, we have thought a possible solution to overcome our problem with minimal impact in layout:
Set RQ = 250 Ohm
Set ODT pin Low, so ODT signals at 75 Ohm.
if Address and other ODT signals must be terminated with a pull up resistor (50 Ohm) to VTT, use a VTT termination regulator (for example NCP51400
http://www.onsemi.com/pub/Collateral/NCP51400-D.PDF or another one), and then place 0201 50 Ohm resistors close to Fanout vias.
can be this solution effective? otherwise what are the alternatives?
Ans) This solution will be okay.
Thanks and Regards,
Pradipta.
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