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No device connected to EMIF read write

yugy
Intellectual 385 points
Other Parts Discussed in Thread: OMAP-L138

Hello,

I want to use EMIF to extend the bus in OMAP-L138 custom board.Now I can get CS5 extend bus in the board.According to OMAP-L138 manual,CS5 memery map is 0x66000000.If no device connected to EMIF,can I read/write the address to change the level of EMA_D and EMA_A pins?

For example,*(vlatile unsigned int*)0x6600 0000 = 0x0 means all EMA_D pins are in low level?While *(vlatile unsigned int*)0x6600 0000 = 0xFFFF means all EMA_D pins are in high level?Is that right?

Thanks.

-----------------

Yu

  • 0
    TI__Expert 5955 points

    Hi Yu,

    Your understand is correct. Even if no device connected to the EMIF bus, you can write a value to the address to change the level of the EMA_D and EMA_pins. When you read from a different address, you will see changes on the EMA_A and maybe not on the EMA_D since there no memory attached to drive the EMA_D.

    Thanks,

    Tai Nguyen