For embedded design, the interchip and intra-system communication bus is usually only a small part of it. Other components include DAC (digital to analog converter), ADC (digital to digital converter), sensor, display, control loop, processor, and electromechanical components, all of which must work in harmony.
If the oscilloscope has only two or four channels, the low speed serial bus may quickly take up all debugging resources. Therefore, mixed signal oscilloscope can improve the flexibility of analytical tools.
Mixed signal oscilloscope (MSO) has not only analog channels, but also many (at least 16) digital channels. Well-designed MSO perfectly synchronizes digital and analog channels, and enables seamless cross-triggering of analog and digital data without performance degradation due to the use of digital channels. When 20 or more time synchronization channels are used simultaneously on the display, the interaction among multiple analog events, digital events and serial events can be analyzed flexibly.
The greatest benefit of embedded system analysis is that the digital channel can be assigned to the serial bus timing and decoding, thereby freeing up the analog channel for time synchronization analysis of other parts. You can verify the physical layer performance of the serial bus portion with the analog channel, then switch to the digital channel to look at the timing and protocol layer, and then measure the delay time of events from the sensor to the processor to the output, or verify the priority arbitration of multiple inputs competing for bus resources.