MPC8544E Cold Boot Problem

[admin]

Hello All,

I am having a problem with my MPC8544E booting up properly from a power on. When HRESET de asserts the "ReadY' bit never goes high and the "Asleep" never goes low so the processor is "hung" But if I do a manual reset (toggle Hreset) or do a SReset" everything is good to go. I am fairly sure (at least in my own mind but....) that I have covered everything in regards to configurations and clocks and so forth but still no luck. Any suggestions would be greatly appreciated. Thank you in advance for your time.

Bryan

[admin]

thank you very much Paul for your responce. Regarding items 1 and 2 and am fairly confident that these are within spec. I have a question regarding item number 2. I am not sure to which signals that you are refering to with the DDR POR signals. I am "assuming" that you are refering to LGPL0 and LGPL1 signals. Is this correct or am I off in left field somewhere. Again thank you for your time.

Best Regards,

Bryan

[genuap · Accepted solution]

Well. It sounds like things stabilize once power is up. So, I would look at:
- Power Sequence
- DDR POR signals (these need to be present very very early in the sequence so the 8544 can drive CKE and the power supplies correctly)
- HW Spec lists a bunch of pins that need to be pulled one way or another (i.e. TEST_SEL, ASLEEP)

 ... Paul