參數(shù)資料
型號(hào)： XIB-E
廠(chǎng)商： Digi International/Maxstream
文件頁(yè)數(shù)： 10/64頁(yè)
文件大小： 1858K
描述： BOARD INTERFACE ETHERNET
標(biāo)準(zhǔn)包裝： 1
附件類(lèi)型： 接口板
適用于相關(guān)產(chǎn)品： XStream 和 Xcite 收音機(jī)
XStream"燨EM燫F燤odule?燩roduct燤anual爒5.x00燵2006.02.24]?/DIV>
2.1.2. Flow Control
Figure?03. Internal燚ata燜low燚iagram?SPAN class="pst XIB-E_2593259_3">(The?/SPAN>five?/SPAN>most?/SPAN>commonlyused?/SPAN>pin?/SPAN>signals?/SPAN>shown.)牋牋
 
 
 
 
DI (Data In) Buffer and Flow Control
When serial data enters the XStream Module through the DI Pin (pin 4), then the data is stored in
the DI Buffer until it can be transmitted.
When the RB and RO parameter thresholds are satisfied (refer to Transmit Mode section [p11]
and command descriptions for more information), the module attempts to initialize an RF
connection. If the module is already receiving RF data, the serial data is stored in the DI Buffer.
The size of the DI Buffer can be determined by issuing the RZ (DI Buffer Size) Command. If the
DI buffer becomes full, hardware or software flow control must be implemented in order to
prevent overflow (loss of data between the host and XStream Module).
How to eliminate the need for flow control:
1. Send messages that are smaller than the DI buffer size. The size of the DI buffer varies
according to the packet size (PK parameter) and the parity setting (NB parameter) used.
2. Interface at a lower baud rate (BD parameter) than the fixed RF data rate.
Two cases in which the DI Buffer may become full and possibly overflow:
1. If the serial interface data rate is set higher than the RF data rate of the module, the module
will receive data from the host faster than it can transmit the data over-the-air.
2. If the module is receiving a continuous stream of RF data or monitoring data on a network,
any serial data that arrives on the DI pin is placed in the DI Buffer. The data in the DI buffer
will be transmitted over-the-air when the module no longer detects RF data in the network.
Hardware Flow Control (
). When the DI buffer is 17 bytes away from being full; by default,
the module de-asserts (high)
 to signal to the host device to stop sending data [refer to FT
(Flow Control Threshold) and CS (DO2 Configuration) Commands].
 is re-asserted after the DI
Buffer has 34 bytes of memory available.
Software Flow Control (XON). XON/XOFF software flow control can be enabled using the FL
(Software Flow Control) Command. This option only works with ASCII data.
DO (Data Out) Buffer and Flow Control
When RF data is received, the data enters the DO buffer and is then sent out the serial port to a
host device. Once the DO Buffer reaches capacity, any additional incoming RF data is lost. The
size of the DO Buffer can be determined by issuing the RZ (DI Buffer Size) Command, then
multiplying the result by 1.5.
Two cases in which the DO Buffer may become full and possibly overflow:
1. If the RF data rate is set higher than the interface data rate of the module, the module will
receive data from the transmitting module faster than it can send the data to the host.
2.   If the host does not allow the module to transmit data out from the DO buffer because of
being held off by hardware or software flow control.
Hardware Flow Control (
). If
 is enabled for flow control (RT Parameter = 2), data will not
be sent out the DO Buffer as long as
 (pin 5) is de-asserted.
Software Flow Control (XOFF). XON/XOFF software flow control can be enabled using the FL
(Software Flow Control) Command. This option only works with ASCII data.
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XILINXPWR-079 功能描述:電源管理IC開(kāi)發(fā)工具 Pow Mgt Eval Mod for Xilinx FPGAs RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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