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Altera_Forum's avatar
Altera_Forum
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13 years ago

Multiple Nios II and Qsys

Hello, Is there anybody that used/have experience with Qsys to fit five Nios II on a Cyclone IV EP4CE22 FPGA? I could only fit one. I need to use SDRAM controller. I'd like to know how many...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Dunno. I don't use JTAG.

At a guess either the JTAG download is resetting all of the cpus, or they are being starved of some Avalon resource.

You can expose the soft reset lines of the nios cpu and connect them to an avalon slave.

Then arrange that system reset (and JTAG reset) leaves all but one in reset.

Use the jtag to load a single image that contains the code/data that all the separate cpus will run.

When the first cpu runs get it to take the other ones out of reset.