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am3359: hi resistors for sysboot pin

shivakumar L V67
Intellectual 315 points

Part Number: AM3359
Other Parts Discussed in Thread: AM3359

Hi 

I have used 10k for pull up and pull down resistor for sysboot pins is this ok?

I have selected SYSBOOT[0:4]=11000b with empty serial flash and empty SD card(MMC0 with 3.3V). now if i check clk pin of both SD card or serial SPI flash on Oscilloscope will I get anything on it?

  • 0
    TI__Guru**** 161600 points
    Hi,

    I'd recommend to follow the AM335x EVM design or the BBB design: 100k pull ups are used in the two designs.

    [quote]I have selected SYSBOOT[0:4]=11000b with empty serial flash and empty SD card(MMC0 with 3.3V)[quote]
    This configures the following boot options:
    SPI0 MMC0 USB0 UART0

    Yes, this means that ROM Code will configure the corresponding interfaces for booting. I advise you to carefully read Chapter 26 Initialization in the AM3359 Technical Reference Manual.
    Also the following wiki provides some additional useful information:
    processors.wiki.ti.com/.../AM335x_Schematic_Checklist

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    TI__Guru**** 161600 points
    Actually if you ensure that SYSBOOT pins are in the desired state at reset release time AND the external resistors do not corrupt the signals on these pins during runtime, you can use any value you choose for pullup resistors.

    Best Regards,
    Yordan