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BF703 connect with LPDDR

Question asked by mars99 Employee on Oct 16, 2014
Latest reply on Oct 29, 2014 by Mitesh

 

My first question is: BF703 datasheet mentioned that DMC_VREF should connect to half of the VDD_DMC voltage. For DDR2, in EZ-KIT, the VREF of DDR2 connects to DMC_VREF which is also connected by a half voltage divider; but for LPDDR, it has no VREF. My question is that: should DMC_VREF be connected to half of the VDD_DMC voltage still for connecting to LPDDR? thanks.

 

 

My second question is: BF703 datasheet mentioned that LDQS and UDQS require a 100k pull-down resistor for LPDDR. I want to know why because I checked that the datasheet of LPDDR and ARM chips don’t have such requirement.

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