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Altera_Forum
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9 years ago

Using EPCQ to load Nios

1) Why can't I get past "No EPCS registers found"? If I try "nios2-flash-programmer --device=1 --base=0x42000000 --epcs --debug" I get: Using cable "USB-Blaster [USB-0]", device 1, instance 0x...
Altera_Forum's avatar
Altera_Forum
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9 years ago

1) Make sure the EPCS pins are configured to be used as general purpose I/O in the Quartus device settings. Otherwise the fpga can properly load the hardware configuration but then the pins are not accessible by Nios or any other 'soft' device.

2) Sure you can run Nios at 100MHz (or whatever f you need) and keep EPCS at 25MHz: this is a quite common configuration.

You simply need a PLL to generate the 2 clocks and a clock crossing bridge between the two sections in Qsys.