XR21V1412 Ver la hoja de datos (PDF) - Exar Corporation

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Fabricante

XR21V1412

2-CH FULL-SPEED USB UART

Exar Corporation 

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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