STM32U585ZIT6Q Booting Issue

[abk]

Hello All,

We have developed board based on STM32U585ZIT6Q Micro-controller.
Clock Frequency - 16MHz

Reset pin is HIGH and BOOT pin is LOW, Also attached BOOT and RESET Pin timings w.r.t Power supply (3V3)

We are facing below issue.

1. We are not able to flash the controller on high frequency JTAG/SWD, Also randomly flash on lower frequency of JTAG/SWD. or communication break

2. After flashing controller will not be Boot up even after power reset cycle.

[TDK]

> We are not able to flash the controller on high frequency JTAG/SWD, Also randomly flash on lower frequency of JTAG/SWD. or communication break

If programming over SWD fails at higher frequency but not at lower frequency, surely this indicates an issue with hardware design. Potentially power supply is an issue, perhaps missing decoupling caps. Could be poorly soldered connections. Could be traces that can not handle higher speed but seems less likely. Can you share the schematic or layout?

> After flashing controller will not be Boot up even after power reset cycle.

Debug your code. Figure out why it will not "boot up". The CPU is certainly doing something. Could be waiting for a clock to start that never does.