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Designing SOCs with Configured Cores by Steve Leibson

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5.7. Ports and Queue Interfaces

One of the most innovative I/O features of Xtensa and Diamond Standard Series microprocessor cores is the availability of TIE-defined ports and queue interfaces that connect the processors’ execution units directly to external devices using point-to-point (non-bused) connections. Ports are wires that either make specific internal processor state visible to external logic blocks (and other processors) or bring external signals directly into the processor where it becomes readable processor state. Xtensa processor cores have configurable ports and some pre-configured Diamond Standard Series cores have pre-configured input and output ports.

Similarly, Xtensa and Diamond queue interfaces are designed to connect directly ...

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