DM8168 ddr VTT电源以及5V电源上电顺序问题

各位：

DM8168 ddr的VTT为什么是接1.5V呢，谁能帮解释一下吗？图片见附件。

5V电源接到N36 N37，这个电源的上电顺序和其他有什么关系？

Shine：

图片分辨率太低了，看不清楚。是EVM板的原理图吗？

zhaohu li：

回复 Shine:

是EVM板

重新上传了附件。

谢谢！！

zhaohu li：

回复 Shine:

是evm板的原理图

已经重新上传附件。

Shine：

回复 zhaohu li:

请看下面的FAQ.Q:why is there a low impedance path between EVM_DDR_VTT and EVM_1V5?A:"To keep VTT quiet and stable.  The planar DDR3 boards work fine.  The reason this is not on DIMM EVM is because VTT was moved to the DIMM."

zhaohu li：

回复 Shine:

Shine Zhang

请看下面的FAQ.Q:why is there a low impedance path between EVM_DDR_VTT and EVM_1V5?A:"To keep VTT quiet and stable.  The planar DDR3 boards work fine.  The reason this is not on DIMM EVM is because VTT was moved to the DIMM."

Shine：

回复 zhaohu li:

1. EVM_DDR_VTT 和 EVM_1V5之间有个0.1uf的电容。2. DIMM原理图如下，没用vtt。http://support.spectrumdigital.com/boards/evm816xdimm/revc/files/evm816xdimm_Schematics_revc.pdf

zhaohu li：

回复 Shine:

Shine Zhang

1. EVM_DDR_VTT 和 EVM_1V5之间有个0.1uf的电容。2. DIMM原理图如下，没用vtt。http://support.spectrumdigital.com/boards/evm816xdimm/revc/files/evm816xdimm_Schematics_revc.pdf

Shine：

回复 zhaohu li:

To keep VTT quiet and stable

zhaohu li：

回复 Shine:

Shine Zhang

To keep VTT quiet and stable