Loopback Mode (Diagnostics)

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

Loopback mode is used for diagnostic purposes. When in loopback mode, the controller must only be programmed to enter configuration mode or issue a reset. In loop back mode, the following actions occur.

The controller transmits a recessive bitstream onto the CAN_PHY_TX bus signal.

TX messages are internally looped back to the RX line and are acknowledged.

TX messages are not sent on the CAN_PHY_TX bus signal. The controller receives all the messages that it transmits.

The controller does not receive any messages transmitted by other CAN nodes.