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AM335x GPMC synchronous v. asynchronous access

Singamsetty Vamsi
Intellectual 880 points

-  I need a Difference b/w the difference between the synchronous GPMC and asynchronous GPMC.

Please Reply ASAP.

Tanks & Regards,

Vamsi.

  • 0
    Expert 2315 points
    Hi ,

    One of the e2e guru wrote in e2e thread, (I don't have link of that thread i thought information is worth so i copied in my notes)

    I quote:

    >> Asynchronous mode: All the Assert/de-assert are done with reference to GPMC_FCLK = 100MHZ(as reference)

    >> Synchronous mode: All assertions/de-assertions are done with reference to GPMC_CLK = 100MHZ / ( 1+ GPMCFCLKDIVIDER)

    >> Normally in Synchronous mode GPMCFCLKDIVIDER = 0x1 ( GPMC_CLK = GPMC_FCLK/2 = 100MHz/2 = 50 Mhz)

    regards,
    Ganesh
  • 0 in reply to Ganesh Biradar
    TI__Guru**** 393215 points
    The main difference is that in sync. mode GPMC_CLK is output from the AM335x during accesses. In async. mode there is no external clock.