Hi!
We have working custom pcb with IMX6ULL based on reference design (number 29364) with only 9 components placed on bottom side of pcb:
There are DDR3 relative parts:
So, I am wondering can I move this components:
- C204 decoupling capacitor for DRAM_VREF;
- R202, R203, R205 resistors that ties to gnd DRAM_SDCKE1, DRAM_SDCKE0 and ZQPAD signals;
- R206 that terminates DRAM_SDCLK0_P and DRAM_SDCLK0_N signals (increases traces length);
- C227, C229, C228 and C230 that terminates DRAM_SDQS0_P, DRAM_SDQS0_N, SDQS1_P and SDQS1_N
little bit away from their current position to place them on top side of pcb? We want to reduce soldering price twice)
Solved! Go to Solution.
Hi Almaz
in general they can be moved, only pay attention to high speed signals
like DRAM_SDCLK0_P and DRAM_SDCLK0_N to avoid ringing and reflections.
Best regards
igor
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Hi Almaz
in general they can be moved, only pay attention to high speed signals
like DRAM_SDCLK0_P and DRAM_SDCLK0_N to avoid ringing and reflections.
Best regards
igor
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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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Seems that DRAM_SDCKE1 and DRAM_SDCKE0 pull down resistors not required at all:
https://community.nxp.com/thread/439876