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參數(shù)資料
| 型號： | XR17V358IB-E8-EVB |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 32/68頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL BOARD FOR XR17V358-E8 |
| 產(chǎn)品培訓(xùn)模塊： | PCIe UARTs UART Product Overview |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，UART |
| 嵌入式： | 否 |
| 已用 IC / 零件： | XR17V358 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | 1016-1294-ND - IC UART PCIE OCTAL 176FPBGA |
| 其它名稱： | 1016-1296 |
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XR17V358
38
HIGH PERFORMANCE OCTAL PCI EXPRESS UART
REV. 1.0.4
3.2
Automatic Hardware (RTS/CTS or DTR/DSR) Flow Control Operation
Automatic hardware or RTS/DTR and CTS/DSR flow control is used to prevent data overrun to the local
receiver FIFO and remote receiver FIFO. The RTS#/DTR# output pin is used to request remote unit to
suspend/restart data transmission while the CTS#/DSR# input pin is monitored to suspend/restart local
transmitter. The auto RTS/DTR and auto CTS/DSR flow control features are individually selected to fit specific
application requirement and enabled through EFR bit[7:6] and MCR bit [2] for either RTS/CTS or DTR/DSR
control signals. The auto RTS/DTR function must be started by asserting RTS/DTR# output pin (MCR bit [0] or
bit [1] to logic 1) after it is enabled. Figure 10 below explains how it works.
Two interrupts associated with RTS/DTR and CTS/DSR flow control have been added to give indication when
RTS/DTR# pin or CTS/DSR# pin is de-asserted during operation. The RTS/DTR and CTS/DSR interrupts must
be first enabled by EFR bit [4], and then enabled individually by IER bits [7:6], and chosen with MCR bit [2].
Automatic hardware flow control is selected by setting bits [7 (CTS): 6 (RTS)] of the EFR register to logic 1. If
CTS# pin transitions from LOW to HIGH indicating a flow control request, ISR bit [5] will be set to logic 1, (if
enabled via IER bit [7:6]), and the UART will suspend TX transmissions as soon as the stop bit of the character
in process is shifted out. Transmission is resumed after the CTS# input returns to LOW, indicating more data
may be sent.
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