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DM814x NAND 8bit setting

ken lim
Prodigy 135 points

Hi,

I'm testing NAND 8bit in DM814x EVM.  I have a query BTMODE 12 setting.

BTMODE12 is low for 8bit NAND, BTMODE12 is high for 16bit NAND.

BTMODE can be set at S1 switch 8th pin in DM814x EVM board.

Originally, NAND 16bit is in DM814x EVM. and switch 8 set to low, it working.

And, 8bit NAND working when switch 8 set to high.

 

BTMODE setting is reversed for NAND type.

Let me know, Why switch setting is reversed for NAND type?