POR Configuration Pull-up/down resistor value

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POR Configuration Pull-up/down resistor value

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hyoungkikim
Contributor III

my new board  use P1011 device and  for POR Configuration  i use 4.7K resistor  for pull-up/down not CPLD

i use that value   based on  P1020RDB schematic

P1020RDB use CPLD but  POR page has  pull-up/down resistors so i followed 

POR configuration Pins are connected with other ICs but those are high-impedance when hreset is asserted

but  sometimes POR configuration value is not set to Pull-up/down setting

if boot fail   i  checked  the values by codewarror

i wondoer  the resistor value is not correct , how do i  chose pull-up/down resistor ?

thank you in advance

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ufedor
NXP Employee
NXP Employee

According to the P1020 Family of QorIQ Integrated Processors Design Checklist, 3.1 Configuration and Timing the 4.7 kOhm is correct value for the configuration resistor.

Please check whether an external device (latch) with Bus Hold functionality is used in the design.

If this is not the case please create a technical case (How I could create a Service Request? ) and provide connection schematics as searchable PDF along with pjojected configuration settings and checked by CodeWarrior ones.

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