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ARM Community: Connecting to legacy devices in a CoreSight system - ARM Community

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Connecting to legacy devices in a CoreSight system Rate Topic: ****- 1 Votes

#1 User is offline   Alon Ziv 

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Posted 14 May 2012 - 10:48 AM

I have a system-on-chip with CoreSight architecture, where a (non-ARM) core is connected to the DAP via JTAG-AP. I need to access this core's TAP with direct JTAG commands (there are no pre-existing tools for this architecture).
Will RDDI provide "transparent" access to this core's scan chain on the JTAG-AP? Or would I need to re-develop the entire DAP protocol just in order to get at my single device?

This post has been edited by Alon Ziv: 14 May 2012 - 10:49 AM

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#2 User is offline   TonyArmitstead 

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Posted 28 May 2012 - 05:04 PM

RDDI, when connected via a RVI or DSTREAM box, will provide transparent high level(*) access to certain older ARM cores, but does not provide for transparent RDDI-JTAG access to generic devices behind a JTAG-AP. So you will need to write your own code to access your device through the JTAP-AP.

(*) By high level access I mean access via the RDDI-Debug interface.
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