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The question why I want to do it is different. Let's just say that replacing JTAG controller with my own custom component as shown in the drawing would be very productive. There is nothing to do with USB-Blaster.
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I'm not sure that you can get to the SLD_HUB JTAG I/O, as its effectively a black box, eg., there's no way for you to intercept TDI/TDO, other than to use an SLD_HUB component and insert your multiplexer between the hub and your JTAG component. I suspect you could insert logic on the hub output to each of the nodes. Its pretty easy to 'sniff' the JTAG traffic from the SLD_HUB JTAG outputs - see the SignalTap traces in the documents above.
But as soon as you're modifying the JTAG interface at that level, there's really no need to use Altera's IP at all.
If you want to discuss what you're doing, but take it off-list, just send an email to my forum name, or if you like, describe what you are really trying to do :)
Cheers,
Dave
Honored Contributor
