XR21V1412 Просмотр технического описания (PDF) - Exar Corporation
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XR21V1412 Datasheet PDF : 24 Pages
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XR21V1412
REV. 1.0.0
2-CH FULL-SPEED USB UART
prevent data overrun to the remote RX FIFO. The CTS# input is monitored to suspend/restart the local
transmitter (see Figure 3):
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
9
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