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Everything is possible, but using JTAG directly isn't documented so you are on your own and must reverse engineer a lot.
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Altera has documented their SLD Virtual JTAG component;
http://www.altera.com/literature/ug/ug_virtualjtag.pdf‎
and I have documented how to use it in detail here:
http://www.ovro.caltech.edu/~dwh/correlator/pdf/vjtag.pdf --- Quote Start ---
I really think learning to use SOPC Builder / QSys and system console would me a more productive use of your time ;)
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I agree. The protocol used by the Avalon-MM bridge is documented here:
http://www.ovro.caltech.edu/~dwh/correlator/pdf/altera_jtag_to_avalon_analysis.pdf http://www.ovro.caltech.edu/~dwh/correlator/pdf/altera_jtag_to_avalon_analysis.zip You can use that information along with the USB-Blaster protocol
http://sourceforge.net/apps/mediawiki/urjtag/index.php?title=cable_altera_usb-blaster To access the FTDI device directly and send JTAG-to-Avalon-MM bytes directly. However, you can also do the same thing using Tcl scripts.
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You can find a tutorial here:
http://www.alterawiki.com/wiki/using_the_usb-blaster_as_an_sopc/qsys_avalon-mm_master_tutorial (thanks Dave for reminding me about this tutorial in another thread!)
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This is also a good reference :)
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For very simple tests (LEDs, buttons) you just need to use PIO components. For more complex interfaces or modules, you can write your own VHDL code and integrate it as a custom component in your SOPC design.
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Start with the Qsys tutorial and use System Console. Use the Tcl server that comes with that code and access it via C# or whatever language you like.
Cheers,
Dave
Honored Contributor
