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5.2.4.3. Multi-Agent Environments
When ss_n is not asserted, typical SPI cores set their miso output pins to high impedance. The provided SPI agent core drives an undefined high or low value on its miso output when not selected. Special consideration is necessary to avoid signal contention on the miso output, if the SPI core in agent mode is connected to an off-chip SPI host device with multiple agents. In this case, the ss_n input should be used to control a tristate buffer on the miso signal.