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  • TI Thinks Resolved

AM3359: SYSBOOT values change unexpectedly

Prodigy 70 points

Replies: 1

Views: 62

Part Number: AM3359

Hi Everybody,

I have Connected SYSBOOT[7:0] pins of AM3359 to either pull-up to 3.3V with 100K or pulldown with 10K to GND as per boot requirement!

When I tried to "Connect Target" using XDS 100v2 in CCS,  the SYSBOOT registers gets red wrongly in tool !

It does not follow the external pull-up/pull down!

I went on randomly decreasing value of resistors for some pins, it ended up in fixing the issue temporarily: as detailed below

SYSBOOT[4] pin pulled HIGH (3.3V) directly (without 100K) and SYSBOOT[5] pin pulled DOWN (GND) without 10K

 

But, this will not be sufficient as I have multiplexed these pins with FPGA. So I need PULLUP/DOWN after AM335x boot is over.

 

Please help me to fix it without removing PULLUP/DOWN

 

Thanks,

Ganesh

  • Hi,

    The most likely reason is that you have external components (FPGA?) and/or voltages biasing the SYSBOOT signals. Please recheck your design.

     

    Best Regards
    Biser

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