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openrisc jtags daisy chain
by hwmin75 on Apr 4, 2013 |
hwmin75
Posts: 20 Joined: Mar 8, 2010 Last seen: Jul 21, 2018 |
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Hi.
We want to wirte romfile by jtag to 2 or more openrisc with DDR. Is it Possible ? thank you.//BestHwang |
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RE: openrisc jtags daisy chain
by nyawn on Apr 4, 2013 |
nyawn
Posts: 173 Joined: Dec 19, 2008 Last seen: May 31, 2023 |
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Can we get some more details on exactly what you want to do? Do you have two completely separate systems, with separate CPUs, busses, and memories, or does the system share a bus and/or a RAM? Do you want to use two separate debug interfaces to write to RAM on two separate busses, one debug interface to write to two separate RAMs on two separate busses...?
To answer the question you seem to be asking in the title, it is possible to daisy-chain two separate debug interfaces on a single JTAG chain, but only with the Advanced Debug Interface (used by minsoc). The older debug interface (used by OrpSOC) will NOT support multiple devices of any kind on a single JTAG chain. |
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