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T1040 Boot failure

Question asked by Johh Boggs on Mar 14, 2019
Latest reply on Mar 18, 2019 by Johh Boggs

I have a T1040 based design configured to read the RCW and boot from a 16 bit NOR flash. Roughly 1 out of 100 times the processor won’t boot at power up. Using an oscilloscope I can see, after PORESET_B is released, HRESET_B never goes high, and there is no activity on IFC_CS0_B, so the processor is not attempting to read the RCW. I am not relying on internal pull up resistors for the CFG_RCW_SRC pins. I have CFG_RCW_SRC _3, CFG_RCW_SRC _6, CFG_RCW_SRC _7 and CFG_RCW_SRC _8 pulled up with 10k ohm resistors and CFG_RCW_SRC _0, CFG_RCW_SRC _1, CFG_RCW_SRC _2, CFG_RCW_SRC _4 and CFG_RCW_SRC _5 pulled down with 4.99k ohm resistors. Cycling PORESET_B low and high again will not take the processor out of this state, only another power cycle will resolve the issue. Do you have any idea what may be causing this issue? Is there another place I should be looking other than voltage rails at start up for an issue?

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