I have a SoC connects to a DSP with SPI. They are all powered by 1.8V, so I didn't even compare SoC's Voh and DSP's Vih at the first time, they should working fine. However, yesterday my colleague told me that the SoC's Voh cannot satisfy DSP's Vih, so I have a detail look:
So from the datasheet view, I cannot connect these SoC and DSP together? Or the minimum Voh is based on highest source current, I need to consider the output impedance of SoC, and input impedance of DSP or maybe also capacitance?