i.MX 8M Plus DDR4 bit swapping

faridmousavi — Thu, 05 May 2022 18:19:41 GMT

Hello,

We are trying to design a custom board based on the i.MX 8M Plus using DDR4. I would like to know if the following bit swap configuration is correct?

DDR4 i.MX8MP

DQ0 ----> DRAM_DQ08

DQ1 ----> DRAM_DQ09

DQ2 ----> DRAM_DQ10

DQ3 ----> DRAM_DQ13

DQ4 ----> DRAM_DQ15

DQ5 ----> DRAM_DQ12

DQ6 ----> DRAM_DQ14

DQ7 ----> DRAM_DQ11

DQ8 ----> DRAM_DQ01

DQ9 ----> DRAM_DQ02

DQ10 ----> DRAM_DQ07

DQ11 ----> DRAM_DQ04

DQ12 ----> DRAM_DQ00

DQ13 ----> DRAM_DQ03

DQ14 ----> DRAM_DQ06

DQ15 ----> DRAM_DQ05

My second question is if this configuration is correct, how should I perform the initialization process as there is no dedicated tab for this purpose on MX8M_Plus_DDR4_RPA_v5?

Thank you

Re: i.MX 8M Plus DDR4 bit swapping

Rita_Wang — Fri, 06 May 2022 08:50:33 GMT

Yes, your connections are OK, for the ddr configuration you can see the https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8MPlus-m865S-DDR-Register-Programming-Aids-RPA/ta-p/1235352

topic i.MX 8M Plus DDR4 bit swapping in i.MX Processors

i.MX 8M Plus DDR4 bit swapping

Re: i.MX 8M Plus DDR4 bit swapping