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A part of i.MX7S eFuse could not be read.

Question asked by Satoshi Shimoda on Oct 4, 2016
Latest reply on Oct 5, 2016 by igorpadykov

Hi community,


Our customer tried reading a i.MX7S efuse, and succeeded reading lot number programmed in 0x410[31:0] and 0x420[10:0].
However, 0x420[31:11] was all "0".
According to Table 6-19 of IMX7DRM Rev.0.1, wafer number and X/Y coordinate should be programmed in the field.
They executed the process chapter and, so we think the procedure was not wrong since they could read 0x410[31:0] and 0x420[10:0] correct.
Do think think why 0x420[31:11] cannot be read?


Best Regards,
Satoshi Shimoda