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CC_SOCU_DLFT in CMPA

Question asked by Hideyuki Kamii on Jun 29, 2020
Latest reply on Jul 30, 2020 by Hideyuki Kamii

Hello,

 

We'd like LPC55S69 to enter "OEM Closed" lifecycle state and close all debug ports permanently.

For this transition, which CMPA configuration is correct?

 

[Configuration 1]

CMPA.CC_SOCU_PIN = 0xFC00.03FF

CMPA.CC_SOCU_DFLT = 0xFC00.03FF (all SOCU_DFLT[n] bit to 1)

 

[Configuration 2]

CMPA.CC_SOCU_PIN = 0xFC00.03FF

CMPA.CC_SOCU_DFLT = 0xFFFF.0000 (all SOCU_DFLT[n] bit to 0)

 

I'd like to confirm the SOCU_DFLT[n] bit polarity.

I'm looking the Table 1062 "Access restriction levels" in UM11126 Rev.2.0, and that shows that "SOCU_PIN[n] = 1 and SOCU_DFLT[n] = 1" mean Restriction Level 3 (Access to the sub-domain is permanently disabled), so I think the above Configuration 1 is correct for disabling debug ports.

 

Best Regards,

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