CTS Flow Control

Versal ACAP Technical Reference Manual (AM011)

Document ID
AM011
Release Date
2022-04-26
Revision
1.4 English

When the CTS flow control is enabled, the transmitter checks the UARTx_CTS_b signal before transmitting the next byte. When the UARTx_CTS_b signal is asserted, it transmits the byte; otherwise, the transmission does not occur.

The data continues to be transmitted while UARTx_CTS_b is asserted, and the transmit FIFO is not empty. When the transmit FIFO is empty and the UARTx_CTS_b signal is asserted no data is transmitted.

When the UARTx_CTS_b signal is deasserted and CTS flow control is enabled, the current character transmission is completed before stopping. When the CTS flow control is disabled and the UART is enabled, the data continues to be transmitted until the transmit FIFO is empty.