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XR21V1410IL16 Datasheet(PDF) 9 Page - Exar Corporation |
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XR21V1410IL16 Datasheet(HTML) 9 Page - Exar Corporation |
9 / 27 page XR21V1410 9 REV. 1.1.0 1-CH FULL-SPEED USB UART 1.5.5 Automatic DTR/DSR Hardware Flow Control Auto DTR/DSR hardware flow control behaves the same as the Auto RTS/CTS hardware flow control described above except that it uses the DTR# and DSR# signals. For Auto hardware flow control, FLOW_CONTROL[2:0] = ’001’. GPIO3 and GPIO2 become DTR# and DSR#, respectively, when GPIO_MODE[2:0] = ’010’. 1.5.6 Automatic XON/XOFF Software Flow Control When software flow control is enabled, the V1410 compares the receive data characters with the programmed Xon or Xoff characters. If the received character matches the programmed Xoff character, the V1410 will halt transmission as soon as the current character has completed transmission. Data transmission is resumed when a received character matches the Xon character. Software flow control is enabled when FLOW_CONTROL[2:0] = ’010’. 1.5.7 Multidrop Mode with address matching The V1410 device has two address matching modes which are also set by the flow control register using modes 3 and 4. These modes are intended for a multi-drop network application. In these modes, the XON_CHAR register holds a unicast address and the XOFF_CHAR holds a multicast address. A unicast address is used by a transmitting master to broadcast an address to all attached slave devices that is intended for only one slave device. A multicast address is used to broadcast an address intended for more than one recipient device. Each attached slave device should have a unique unicast address value stored in the XON_CHAR register, while multiple slaves may have the same multicast adderss stored in the XOFF_CHAR register. An address match occurs when an address byte (9th bit or parity bit is ’1’) is received that matches the value stored in either the XON_CHAR or XOFF_CHAR register. FIGURE 4. AUTO RTS AND CTS FLOW CONTROL OPERATION RTSA# CTSB# RXA TXB Transmitter Receiver FIFO Trigger Reached Auto RTS Trigger Level Auto CTS Monitor RTSA# TXB RXA FIFO CTSB# Remote UART UARTB Local UART UARTA ON OFF ON Suspend Restart RTS High Threshold Data Starts ON OFF ON Assert RTS# to Begin Transmission 1 2 3 4 5 6 7 Receive Data RTS Low Threshold 9 10 11 Receiver FIFO Trigger Reached Auto RTS Trigger Level Transmitter Auto CTS Monitor RTSB# CTSA# RXB TXA INTA (RXA FIFO Interrupt) RX FIFO Trigger Level RX FIFO Trigger Level 8 12 RTSCTS1 |
Similar Part No. - XR21V1410IL16 |
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Similar Description - XR21V1410IL16 |
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