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Getting data OUT of the FLASH during AS configuration doesn't work with "alternative" devices.
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As stated in your original thread, it did work in the past with other "alternative" devices. In so far the statement is too general, I think.
It's necessary to check in detail why the different devices fail and whether the problem can be fixed or not.
The other point is this. Altera has never been a flash manufacturer, instead they sold rebranded third party chips with large surcharge. Intel stopped making flash memory many years ago. Apart from the price differences that matter in sensitive application, the Altera EPCS/Q chip portfolio suffered from a limited offer of package and supply voltage variants.
Thus there are many reasons to use "alternative" chips as serial configuration devices. The straightforward solution would be to give complete information about device requirements and possibly add support for industry standard flash devices in tools.
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