I/O Mode Switch

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

Document ID
UG1085
Release Date
2022-09-15
Revision
2.3 English

The mode switch controls the routing of the RxD and TxD signals within the controller as shown in This Figure. The loopback using the mode switch occurs regardless of the MIO-EMIO routing of the UARTx TxD/RxD I/O signals. There are four operating modes as shown in This Figure. The mode is controlled by the uart.mode [CHMODE] register bit field: normal, automatic echo, local loopback and remote loopback.

Figure 21-6:      UART Mode Switch for TxD and RxD

X-Ref Target - Figure 21-6

X19863-mode-switch-txd-rxd.jpg