Two cpu's with one JTAG UART

Question

Hi All  I&amp;#39;ve just upgraded from Quartus 4.2 and Nios 1.1 to Quartus 5.0 and NiosII v5.0. One of the first projects I&amp;#39;ve tried to convert has two processors in it using the same Jtag Uart (so that I can debug either one of them through the IDE). This was perfectly ok in SOPC builder 4.2 but the new SOPC Builder complains that I can&amp;#39;t have two masters on the same JTAG Uart.  Is this a bug or is there a way around this problem ?   Regards Nir

altera_forum · Answer

You can have multiple JTAG Uarts in a system and the IDE will support it if you create seperate hardware configurations then run in multiprocessor mode. This document shows a different way to go about this where multiple masters communicate to a single master that talks to the JTAG Uart

http://www.altera.com/literature/tt/tt_nio...or_tutorial.pdf (http://www.altera.com/literature/tt/tt_nios2_multiprocessor_tutorial.pdf)

Hope that helps.

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Two cpu's with one JTAG UART

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