SPRUJG3 March 2025
The AM263Px Control Card supports a fast serial interface by terminating the SoC signals to a 10 pin header. The interface has two lines of data and a clock line for both the receive and transmit signals. The header is connected to the 3.3V IO voltage supply (VSYS_3V3_LDO1).
The FSI signals go through a 1:2 signal routing mux. There is a pull-up resistor on the select line of the mux and therefore the FSI signal routing is the default. To use MCAN4 and MCAN5, the FSI_MUX_SEL GPIO of the IO expander must be configured as a logic low output.
| Select | Condition | Function |
|---|---|---|
| Low | MCAN signals selected | A → B1 |
| High (default) | FSI signals selected | A → B2 |
Figure 2-27 FSI Header