Nor Flash Forum Discussions

[ramuc_4184856]

Hi,

I plan to use S25FL256S (S25FL256SAGMFIR01) in my design for 1.8V VIO operation. Attached is the schematics.

I have 3 supplies

1. B_1V8_SF - 1.8V for serial flash (generated for sequencing)
2. B_3V3_D - 3.3V System Supply
3. B_1V8_D - 1.8 V System Supply

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.

Please suggest

[SudheeshK · Accepted solution]

Hi Rakesh,

You can pull up the signals HOLD, WP and CS to power rail B_1V8_D.

Thanks and Regards,

Sudheesh