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Altera_Forum's avatar
Altera_Forum
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14 years ago

How to use an EPCS Flash

Hallo together, I'm actually trying to save data from NIOS II into an EPCS64 device. My system contains an EPCS controller. But now the confusion is complete, there are so many files for usin...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

id=0xff is definitely an error, since this means the data rx line is stuck to high level, namely the undriven state or, equivalent, the epcs_controller rx register contains invalid data.

Then read and write operations will probably not work.

Regarding the fact you need to perform those calls in main, please note this remark I found in altera_avalon_epcs_flash_controller.h header file just before

ALTERA_AVALON_EPCS_FLASH_CONTROLLER_INSTANCE/_INIT definitions :

/*

* Macros used by alt_sys_init.c

*

* By default this driver is initialised in alt_sys_init. However if the

* "small driver" feature has been selected, or if fast simulation has been requested

* no initialisation is performed.

*

* This causes the driver to be excluded from the system (unless explicitly

* initialised by the user from main()), and therefore reduces code footprint.

*

*/