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Hi,
We are testing the programming of the TC3E7 on our own board,and because of some bugs, we did not bring the HWCFG pins out (NC), after power-on, we found that the PORST and ESR0 ports are always kept low (external pull-up), and we can't use miniwiggler to flash code (This is a empty chip).
We checked ESR0 and PORST with an oscilloscope and found that they were only pulled up to a certain voltage and then pulled down immediately( in 200us). And we also remove the resistors related to HWCFG on the KIT_A2G_TC397_3V3_TFT, but it still can be burned.
So we want to know what factors lead to this result.
Thank you very much!
Solved! Go to Solution.
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Then check all supplies, I expect that any supplies is missing therefore, PORST is low.
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Check all voltages, they are needed that PORST goes to high. There is a pull-up on PORST on your board?
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Yes, there is a pull-up (+3V3 and 2.2K) on PORST on our board
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Then check all supplies, I expect that any supplies is missing therefore, PORST is low.