I want to communicate over SPI with 16MHz.
The issue is that there is an isolation IC with a 32nsec propagation delay between the master (XMC4800) and slave device.
1. Master delay compensation did not work on my first attempt. USIC AI.008 provides an explanation for why the "close loop delay compensation" does not working. Still not fixed?
2. The datasheet describes that sharp edge (A2) pads rise/fall time 3.7nsec. In my testing the "strong driver sharp edge" pads faster than "strong driver soft edge", but still rise/fall time about 20 nsec. I miss something?
I must correct the second issue. I retest my circuit and demonstrate that the rise time (1V to 2V3) for a sharp edge pad is approximately 4nsec. However, I'm still awaiting a response to my first question.