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mt29f2g16abaeawp can't work

Howard I
Intellectual 340 points

Hi,

   According to TI's 814x  schematic diagramms ，I design my board.  Nand flash(MT29F2G16AADWP) can not work.

I check reset operation's timing diagramms , CLE,CE#,WE#,I/Ox  signal is correct, but R/B# is incorrect ,  R/B# signal

is no changed , al ways is high. .  R/B# signal should be high->low->high.

David

 

  • 0
    TI__Guru**** 393215 points
    Hi David,
     
    According to the NAND Flash datasheet "The R/B# output provides a hardware method of indicating the completion of a PROGRAM/ERASE/READ operation. The signal is typically HIGH, and transitions to LOW after the appropriate command is written to the device..." It seems that the NAND doesn't receive commands correctly. Several things come to mind:
     
    - Do you have any lines on the data bus swapped?
    - R/B# is an open-drain NAND output. Do you have an external pull-up resistor?
    - Have you checked the pin-muxing of the DM814X pin that R/B# is connected to?
    - Is your GPMC interface powered at 3.3V on the DM814X side?
     
    Best Regards
    Biser