Hello. I created a motherboard with a 1020A processor. and when the board is turned on, the processor behaves differently each time. Often there are situations in which the processor does not respond to PORESET_B. This happens when the line RESET_REQ_B produces 0. When RESET_REQ_B 1 starts, the processor starts abnormally after PORESET_B, it is loaded from the SD card. But the processor starts randomly. What could be the problem of such impermanence?
Please check if TRST pin is connected as recommended in LS1021A Design Checklist, Figure 32
LS1021A Design Checklist is available for download from LS1020A page, "Documentation" tab:
Have a great day,
Alexander
TIC
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