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AM335x - NOR flash timing evaluation

Simon Gantenbein
Prodigy 230 points

Hi there,

it may be a stupid question, but are there any instructions available how the GPMC timings of an attached NOR flash have to be calculated out of the standard JEDEC timings that are stated in the datasheet of the NOR flash manufacturer?

I read throuhg the GPMC chapter of the technical reference manual and through the datasheet of the flash manufacturer and unfortunately I have to say, that I am too stupid to associate the right JEDEC timings with the timining diagrams given in the technical reference manual. What I would expect is something like this:

OEONTIME = tELQV - tGLWV

This way it would be quite clear how the OEONTIME of the GPMC module has to be configured. Please let me know if such a "HowTo" somewhere exists.

Best regards

Simon

  • 0
    TI__Guru**** 393215 points

    Hi Simon,

    There is no such guide, but sections 7.1.5.1.3 - 7.1.5.1.5 from the AM335X TRM Rev. L give examples how to calculate NOR timings for different use cases.

  • 0 in reply to Biser Gatchev-XID
    Prodigy 230 points

    Hi Biser,

    thanks for the info. I already knew the chapters in the technical reference manual. The examples there were helpful to setup the NOR timings if the standard JEDEC timing names were used, but unfortunately that is not the case. So I have to guess which JEDEC timings build up the timings stated in the technical reference manual. And then follow the example to calculate the timings needed by the GPMC module. I hoped that there is an easier (and better documented) way to get the right timings.

    Best regards

    Simon