I only find the information like this for imx6ull
the package marking scheme is as follows. The upper row is the part number. The next row is the manufacturing site code (first 3 letters) and manufacturing date code (next 4 digits). The third row is the maskset code. And, finally, the bottom row is the country of origin (on the left) and lot ID code (on the right).
if you need to confirm this is valid or not, pls contact nxp marketing team to confirm this
Dear Joan,
Please help to confirm the circle mark in the topside. Is this due to assembly process and just normal?
There's no effect on functionality?
sorry, we couldn't offer such information, where did you get this chip? you need contact them