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Knug's avatar
Knug
Icon for Contributor rankContributor
5 years ago

How to handle properly pfl_flash_access_granted & pfl_flash_access_request signals ?

Hi @YuanLi_S_Intel How to handle properly pfl_flash_access_granted & pfl_flash_access_request signals if PFL uses both Flash Programming + FPGA Configuration mode Looked at the PFL doc : https...
JohnT_Altera's avatar
JohnT_Altera
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi,


May I know if the nConfig is only connected to CPLD or it is connected to other host as well? The reason is that something is driving the nConfig low which cause the issue. We will need to figure out where it is driving from.


Knug's avatar
Knug
Icon for Contributor rankContributor
5 years ago

Hi @JohnT_Intel

nConfig is an output from the CPLD and it is connected directly to the FPGA nConfig pin (input) and has a 10K pull up resistor.

It may be trying to do FPGA configuration at the start and puts nConfig line low together with Conf done (nStatus remaining high) and fails doing it (will be re-checking this) when I try to configure/program the PFL before even autodetecting the flash to program/configure it with the FPGA application code and thus when I reach that stage nConfig line is still held low !