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AM335x GMPC pins Hi-Z

Kzk
Genius 5785 points

Hello,

I want the system composed some processors and a SRAM. The external bus of AM335x and other processor have shared external SRAM. SRAM is not dual port RAM. And there is not the logic around SRAM. CPU buses need the arbitration each other. Can it realize? I'm not sure, but I think it's difficult. Because if I use external WAIT pin, but GPMC can not change all pins to Hi-Z state. Do you know how to realize it?

Regards,
Kazu

  • 0
    TI__Guru**** 393215 points

    Hi Kazu,

    For AM335X this is not possible. The GPMC bus state is controlled entirely from the processor. The thing that you can possibly do is have a couple of handshaking signals between the two processors and pinmux the AM335X GPMC to GPIO inputs (without pullup/pulldown resistors) on request from the other processor.