I plan to use S25FL256S (S25FL256SAGMFIR01) in my design for 1.8V VIO operation. Attached is the schematics.
I have 3 supplies
In system board power sequencing is such a way that B_1V8_D --> B_3V3_D --> B_1V8_SF.
in order to meet the sequencing need for i generate B_1V8_SF from B_3V3_D.
pls review my schematics
My concerns are
1. Which pull up (HOLD & WP) rail I should use B_1V8_D or B_1V8_SF?? my concern is since B_1V8_D come first will it raise the voltage level of VIO rail via input pins??
2. IF I need to cull up CS as suggested in data sheet which rail should I use.
You can pull up the signals HOLD, WP and CS to power rail B_1V8_D.
Thanks and Regards,