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AM5716 GPMC IO Direction

Michael Doyle
Intellectual 710 points
Other Parts Discussed in Thread: AM3505

Hi

Apparently the AM57XX family GPMC bus doesn't have a gpmc_io_dir signal, which was on older Sitara processors. Should I just use GPMC_OEn - i.e., will OE have similar timing to the old IO_DIR? I'm trying to re-use big pieces of a design based on the AM3505, and I need something to tell the two-way buffers on signal GPMC_AD[15:0] which direction to drive.

thanks!

MADman

  • 0
    TI__Guru**** 161600 points
    Hi,

    The GPMC_OE & GPMC_WE signals are explained in sections 15.4.4.9.4 nOE/nRE: Output Enable/Read Enable Signal Control Assertion/Deassertion Time (OEONTIME/ OEOFFTIME / OEEXTRADELAY / OEAADMUXONTIME / OEAADMUXOFFTIME) and 15.4.4.9.5 nWE: Write Enable Signal Control Assertion/Deassertion Time (WEONTIME / WEOFFTIME /WEEXTRADELAY) respectively.

    I am not that familiar with the GPMC implementation in AM3505, but from what I read in the TRM, the signals GPMC_OE/GPMC_WE (in AM57xx) & the gpmc_io_dir (in AM3505) are not equivalent.

    Best Regards,
    Yordan