LPDDR4

EErdem — Mon, 18 Jan 2021 07:01:02 GMT

Hello,

We are designing a single board computer using i.MXX8MM Soc.

In our case, we have 2 GB LPDDR4 which is the same as the EVK.

My Stack Up is

Top Layer Signal ( some of DDR data signals)

Mid Layer 1 GND

Mid Layer 2 SİGNAL ( Some of DDR data signals)

Mid Layer 3 POWER(DDR Main Power)

Mid layer 4 GND

Mid Layer 5 Signal(DDR Clock)

Mid layer 6 1.8V Power

Bottom Layer Signal

From the hardware design guide, what I understand mid layer 2 and mid-layer 5 should have a solid ground plane both above and below.

Q1: Must I provide a ground plane for both mid layer 3 and mid layer 6.

Q2: Is it enough to provide a ground plane just only one side rather than both sides.

Q3: Could you answer the second question for MIPI, USB, PCIe, SDIO, etc.

Q4 : Also , we want to use 4GB LPDDR4 that have same package with EVK LPDDR4(MT53D512M32D2DS-053 AUT: D) Do you suggest any of LPDDR4 (From the NXP community we found that MT53D1024M32D4DT-053 can be fit could you check it?)

Note : To be more clear I have attached a word file which shows the layer order and routing for LPDDR4 layout.)

Re: LPDDR4

igorpadykov — Mon, 18 Jan 2021 08:48:45 GMT

Hi EErdem

1. no

2. for 2 ,5 layers it is necessary on both sides.

3. please follow recommendations given in i.MX 8M Mini Hardware Developer’s Guide

4. yes MT53D1024M32D4DT-053 can be used.

Best regards
igor

i.MX ProcessorsのトピックLPDDR4

LPDDR4

Re: LPDDR4