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MIC-6315 DDR4 Circuit diagram, The DDR_VREFCAB reference voltage ripple is too large (R204 and R206 DDR_VREFCAB ripple 30~50mV), so I use U137 pin6 (output VTTREF) when DDR_VREFCAB reference voltage, I want to ask, I use TPS51200 PIN 6 when DDR_VREFCAB reference voltage Is it feasible?
Thanks for your replies.
Could you please verify if this inconvenience can be reproduced with any of the memory listed in the following website?
It is important to let you know that the use of TPS51200 REFOUT is feasible, but note that VREFCA is supplied by the SoC by the DDR_VREF signal and is filtered by low pass filter near the DIMMs.
In some CRBs the DIMM's VREFCA and CPU pin CR52 DDR_VREF are using the reference from resistor divider down from the VDDQ instead of the VTT LDO TPS51200 REFOUT (pin 6).
We hope that this information may help you.