Serial Flash Loader Megafunction (SFL) - how to

This design should be basically equivalent to EPC2 factory SFL design.

Although my example originates from EPC3, I have also used it with

Cyclone II without problem. There may be a problem, that an unconfigured

AS memory device is interfering with JTAG. The Quartus programmer

has an option "Halt on-chip configuration controller" to avoid this situation.

As a (really trivial) reason, the sof-file selected in Quartus programmer may be

different from the current compiled design.