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Max HCLK Speed of TMDS570LS31USB

Dennis Jeppesen
Prodigy 50 points

An important note on the TMDS570LS31USB is: "All applications run on the Development Stick should be limited to 100 MHz HCLK Speed"

I am able to run my application at 160 MHz, but what is the reason/concern to restrict at 100 MHz? 

Power? If so, I can supply it with a proper power supply

Temperature? If so, I can mount a heatsink on the MCU.

best regards

Dennis

  • 0
    TI__Guru 69070 points

    Yes Dennis - at 160MHz the stick may consume more than 500mA which is all that's allowed from USB. Therefore it may not work on some USB ports. If you understand that and you plug it into a port that provides > 500mA without issue then you can keep going as you are.

    EDIT: Just remember that as you add code - activity on the device may drive current consumption higher. 

    So even if a simple 'blinky' works today at 160MHz if you start turning on additional peripherals and or start running things like DSP algorithms or BIST tests - your 160Mhz may start tripping the USB current limit.


    Also the board is not designed to be externally powered - only USB bus powered.  So do not try to power it externally or you may damage your USB port. 

    Last - I would suggest getting yourself a launchpad instead of the USB stick if at all possible.   The launchpads are now less $ and more robust.   They are also designed to be self powered if required.

  • 0 in reply to Anthony F. Seely
    Prodigy 50 points

    Hi Anthony

    Thank you for the reply, i will monitor the usb bus power.

    The launchpads are not an option for me, as i need the TMS570LS31 MCU