A connection with 2 UDE instances to the same UAD2/UAD3 via Firewire or USB fails with connection to access device lost.
Why?
If you want to connect with more than one instance to only one UAD2/UAD3 via USB/Firewire the 'MultiAccess' Option must be enabled in the CommDev section of the Target Config File (*.cfg).
Example:
...
[Controller0.CORTEX.CortexJtagIntf.UAD3CommDev]
...
MultiAccess=1
...
Another solution is to use Ethernet instead of Plug and Play ports or to use different ports (e.g. USB and Firewire or USB and Ethernet).
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