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In this case, the best advice regarding this documentation inquiry should be addressed by your board manufacturer; they should be able to provide this type of pin documents. I would also like to share with you that our Intel® Developer Zone can provide more feedback regarding the read and write on GPIO matter. Finally, for these type of processors the support is provided by the Intel® Embedded Design Center, so in this case if you would like to get clarification regarding the datasheet mentioned, my recommendation is getting in contact with them. You can use their forum support; Forum: Embedded Community |Embedded Community.