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Hardware Description
4.9 SPI
The AM263x Control Card maps two SPI instances (SPI0,SPI1) from the AM263x SoC to the HSEC 180 pin
connector. Series termination resistors are placed near the SoC for each SPI clock signal.
4.10 UART
The AM263x Control Card uses the XDS110 as a USB2.0 to UART bridge for terminal access. UART0
transmit and receive signals of the AM263x SoC are mapped to the XDS110 with a dual channel isolation
buffer (ISO7221CDR) for translating from the 3.3V IO voltage supply to the 3.3V XDS supply. The XDS110 is
connected to a micro-B USB connector for the USB 2.0 signals. ESD protection is provided to the USB 2.0
signals by a transient voltage suppression device (TPD4E004DRYR). The micro-B USB connector's VBUS 5V
power is mapped to a low dropout regulator (TPS79601DRBR) to generate the 3.3V XDS supply. A separate
3.3V supply for the XDS110 allows for the emulator to maintain a connection when power to the Control Card is
removed.
The Control Card supports an additional UART1 instance that has the transmit and receive signals mapped from
the AM263x SoC to the HSEC connector. To make use of UART1, the select line of a 1:2 mux must be high. The
select line is driven by a GPIO signal (LIN_MUX_SEL) that is sourced from the IO expander.
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AM263x Control Card Hardware User's Guide
Figure 4-16. SPI
Figure 4-17. UART-USB Bridge for Emulation
Copyright © 2023 Texas Instruments Incorporated
SPRUJ09C – MARCH 2022 – REVISED FEBRUARY 2023
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