XR21V1410 Datasheet, PDF (8/23 Pages) Exar Corporation – 1-CH FULL-SPEED USB UART

XR21V1410
1-CH FULL-SPEED USB UART
REV. 1.0.0
FIGURE 3. AUTO RTS AND CTS FLOW CONTROL OPERATION
Local UART
UARTA
Receiver FIFO
RXA
Trigger Reached
Remote UART
UARTB
TXB
Transmitter
Auto RTS
Trigger Level
Transmitter
RTSA#
TXA
CTSB#
RXB
Auto CTS
Monitor
Receiver FIFO
Trigger Reached
Auto CTS
Monitor
CTSA#
RTSA#
CTSB#
TXB
Assert RTS# to Begin
Transmission
1
ON
2
ON
3
Data Starts
4
RXA FIFO
Receive
INTA
(RXA FIFO
Data ^{RX FIFO}
5
Trigger Level
Interrupt)
RTSB#
Auto RTS
Trigger Level
OFF
7
8 ^OFF
10 ON
11
ON
6 _Suspend
Restart
9
RTS High
Threshold
RTS Low
Threshold
RX FIFO
12 _{Trigger Level}
RTSCTS1
8