Request for LPDDR4 byte swapping in i.MX8DXL

[puneethkumar]

Dear Team,

In the hardware guide of i.MX8DXL it is mentioned like Byte swapping within the 16-bit channel is not supported in case of i.MX8DXL.

1) What does it mean exactly.

2) In the reference schematics they have done bitswapping with one one byte - is that ok? 

[igorpadykov]

Hi Puneeth

1. In case of 8DXL/SXL, byte swapping is not allowed with LPDDR4 but is allowed with DDR3L.
This is due to SoC design limitation, which would prevent to correctly read the mode registers if

the data bytes were swapped. Then, since DDR3L does not support mode register reads, the byte swapping restriction does not apply to it.

2. it is ok

Best regards
igor