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Hardware Description
The MCAN transceiver has two power inputs, VIO is the transceiver I/O level shifting supply voltage and VCC is
the transceiver 5 V supply voltage. The SoC CAN data transmit data input is mapped to TXD of the transceiver
and the CAN receive data output of the transceiver is mapped to the MCAN RX signal of the SoC with a series
termination resistor close to the transceiver.
The standby control signal is a GPIO signal sourced from the IO expander. The STB control input is active high
and a pulldown resistor is used to have the transceiver operate in normal mode as opposed to the standby mode
that is default due to a weak internal pull up.
The system has a 120 Ω split termination on the CANH and CANL signals to improve EMI performance. Split
termination improves the electromagnetic emissions behavior of the network by eliminating fluctuations in the
bus common-mode voltages at the start and end of message transmissions.
The low- and high-level CAN bus input output lines are terminated to a three pin header.
4.12 FSI
The AM263x 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 3.3 V IO voltage supply.
4.13 JTAG
The AM263x Control Card includes an XDS110 class on-board emulator. The control card also has the option to
map the JTAG signals from the AM263x SoC to the HSEC connector.
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AM263x Control Card Hardware User's Guide
Figure 4-20. FSI Header
Figure 4-21. JTAG
Copyright © 2023 Texas Instruments Incorporated
SPRUJ09C – MARCH 2022 – REVISED FEBRUARY 2023
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