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data rate controller
Tradução de "data rate controller" em chinês
数据率控制器
Depending on the state of the bit rate indication field, e.g. depending on whether the BRS field 714 corresponds to a recessive or a dominant bit, the data rate controller 410 may generate a corresponding output signal H/L (or change the level of the output signal H/L to a corresponding value) which is a precondition for the switching on of the third transistor 402 and the fourth transistor 406 which, when activated, provide the second current path which may only be used during the second data transmission mode.
根据比特率表示字段的状态，例如，根据BRS字段714与空闲位还是占有位对应，所述数据率控制器410可生成对应输出信号H/L（或将输出信号H/L的电平改变为对应值），这是打开第三晶体管402和第四晶体管406的前提，第三晶体管402和第四晶体管406打开时提供第二电流通路，第二电流通路仅可在第二数据传输模式下使用。
The second data transmission mode may be initiated by the data rate controller 410 which monitors the stream of data to be transmitted TxD and, in dependence of the state of the bit rate indication field, may generate a corresponding data rate indicating signal H/L (or change the value thereof from a value indicating the operation in the first data transmission mode to a value indicating the operation in a second data transmission mode). The data rate indicating signal H/L may be processed by the logic AND-gate 404 and cause switching on (rendering conducting) the second current path which may thereby be involved into the process of signal generation.
所述第二数据传输模式可由数据率控制器410启动，所述数据率控制器410监控要传输TxD的数据流，并且，根据比特率表示字段的状态，可生成对应的数据率表示信号H/L（或将其值从表示第一数据传输模式下的运行的值改变为表示第二数据传输模式下的运行的值）。所述数据率表示信号H/L可由逻辑与门404进行处理，使第二电流通路打开（呈现导电状态），因此，第二电流通路可加入信号生成过程。
As can be seen in FIG.A, the signal H/L which may be seen as a data rate indicating signal corresponding to the output signal 506 may be generated on the basis of the data TxD by the data rate controller 410 inside the transceiver 504 according to various embodiments. The data rate indicating signal H/L may be applied to and used within the transmitter circuit 502 according to various embodiments to switch its mode of other words, the data rate indicating signal H/L may specify, that the transmitter circuit 502 according to various embodiments is to be operated in the first data transmission mode or in the second data transmission mode.
如图5A所示，可基于根据各个实施例的收发机504内的数据率控制器410产生的数据TxD生成信号H/L，信号H/L可作为与输出信号506对应的数据率表示信号。所述数据率表示信号H/L可施加给根据各个实施例的发射机电路502或在其中使用，以切换其运行模式。换句话说，所述数据率表示信号H/L可指定根据各个实施例的发射机电路502在第一数据传输模式或者第二数据传输模式下运行。
The preconfigured bit rate which may be used to transmit data fields following the BRS field 714 and may be faster than the standard bit rate, as the arbitration phase is finished at preconfigured bit rate, if used at all, may be switched back automatically to the standard bit rate when a CRC (cyclic redundancy check) field (not shown in FIG.) is reached which follows the data field 722. The data rate controller 410 may be configured to detect a message integrity field, e.g. the CRC field, and alter the data rate signal H/L (e.g. change its bit value to the opposite value with respect to the value indicating the operation in the second data transmission mode) appropriately to cause the transmitter circuit 400 according to various embodiments to switch from the second data transmission mode to the first data transmission mode.
预设比特率可用于传输BRS字段714之后的数据字段，可在判优阶段结束时快于标准比特率。所述预设比特率，如果完全使用，可在到达数据字段722之后的CRC（循环冗余校验）字段（图7中未显示）时自动切换回标准比特率。所述数据率控制器410可用于检测消息完整性字段，例如，CRC字段，并适当改变数据率信号H/L（例如，将其比特值改变为与表示第二数据传输模式下的运行的值相对的值），使根据各个实施例的发射机电路400从第二数据传输模式切换到第一数据传输模式。
In the following it will be assumed that the data rate controller 410 detects during phase C a state of the bit rate indication field within the frame format of the message containing data TxD which indicates that data TxD (e.g. the part of the message following the bit rate indication field in the frame format of the message) is to be sent at the preconfigured data rate by the transmitter circuit 400 according to various embodiments. The bit rate indication field itself indicates, whether the part of the message following the bit rate indication field is to be transmitted at the standard bit rate or at the preconfigured bit the exemplary scenario shown in FIGS.A and 6B, at the end of phase C, i.e. at time t4, the transmitter circuit 400 according to various embodiments is switched into the second data transmission mode.
下文假定数据率控制器410在相位C期间检测包含数据TxD的消息的帧格式内的比特率表示字段的状态，所述比特率表示字段表示数据TxD（例如，消息的帧格式中比特率表示字段之后的消息部分）将由根据各个实施例的发射机电路400以预设数据率发送。所述比特率表示字段表示比特率表示字段之后的消息部分将以标准比特率还是预设比特率传输。在图6A和6B所示的示例实施例中，在相位C的末尾，即，时间t4下，根据各个实施例的发射机电路400切换到第二数据传输模式。
As already mentioned, the data rate controller 410 is responsible for detecting the state of the bit rate indication field, e.g. its bit value, within the frame format of the message containing data to be transmitted TxD by the transmitter circuit 410 according to various embodiments. In the CAN architecture, data to be transmitted TxD is transmitted via CAN messages which have a specified data frame format. In FIG. the standard format of a CAN FD message 700 is shown, i.e. a CAN message which may be transmitted at a flexible data rate.
如上所述，所述数据率控制器410负责检测包含将由根据各个实施例的发射机电路410传输TxD的数据的消息的帧格式内的比特率表示字段的状态（例如，比特值）。在CAN架构中，将传输TxD的数据通过具有特定数据帧格式的CAN消息传输。图7显示了CAN FD消息700，即，可以灵活数据率传输的CAN消息的标准格式。
The logic AND-gate 404 combines the output signal H/L from the data rate controller 410 with the data TxD currently being sent and outputs a corresponding signal which controls the third switch 402 and the fourth switch 406. In a sense, the data rate controller 410 and the logic AND-gate 404 may be seen to form a switching circuit which is configured to detect the state of a bit rate indication field and switch the data transmission mode of the transmitter circuit 400 according to various embodiments correspondingly, for example from the first data transmission mode into the second data transmission mode, when the bit rate indication field indicates that data TxD is to be sent at the preconfigured bit rate.
所述逻辑与门404将来自数据率控制器410的输出信号H/L与当前发送的数据TxD相结合，并输出控制第三开关402和第四开关406的对应信号。在某种意义上，所述数据率控制器410和逻辑与门404可形成用于检测比特率表示字段状态的切换电路，并在比特率表示字段显示数据TxD将以预设比特率发送时，将根据各个实施例的发射机电路400的数据传输模式对应地从（例如）第一数据传输模式切换到第二数据传输模式。
This may be achieved by switching off the first transistor 304 and the second transistor 312 and switching on the third transistor 402 and the fourth transistor 406. The third transistor 402 and the fourth transistor 406 which provide the second current path are only switched on in the second data transmission mode during the provision of a recessive bit by the transmitter circuit 400 according to various embodiments. The switching on of the third transistor 402 and the fourth transistor 406 in the second data transmission mode may be effectuated by a corresponding signal which is generated by data rate controller 410 upon detection of a corresponding state of a bit rate indication field within the data to be transmitted TxD by the transmitter circuit 400 according to various embodiments.
这可通过关闭第一晶体管304和第二晶体管312，打开第三晶体管402和第四晶体管406而实现。提供第二电流通路的所述第三晶体管402和第四晶体管406仅在根据各个实施例的发射机电路400在第二数据传输模式下提供空闲位时打开。在第二数据传输模式下打开第三晶体管402和第四晶体管406可通过数据率控制器410在检测根据各个实施例的发射机电路400要传输TxD的数据内的比特率表示字段的对应状态时生成的对应信号而实现。
In step 904, the method may include switching the mode of operation of the transmitter circuit from the first data transmission mode to the second data transmission mode depending on the state of the bit rate indication field. The data rate controller 410 may be configured to read the bit rate indication field, e.g. the BRS field 714, within the CAN FD message 700 which is received at the input 316 of the transmitter circuit 400 according to various embodiments.
在步骤904中，所述方法可包括：根据比特率表示字段的状态将发射机电路的运行模式从第一数据传输模式切换到第二数据传输模式。所述数据率控制器410可用于读取根据各个实施例的发射机电路400的输入端316接收的比特率标识字段，例如，CAN FD消息700内的BRS字段714。
In the embodiments of the communication circuit 500 shown in FIGS.A and 5B the controller 106 may be configured as a CAN controller, for example a CAN microcontroller. The data rate controller 410 may be configured as a CAN FD controller which, among other features, may be configured to detect whether a first part or the second part of a message frame of data TxD and be further configured to indicate to the transmitter circuit 502 according to various embodiments that the second part of the message data frame is to be sent in the second data transmission mode.
在图5A和图5B所示的通信电路500的实施例中，所述控制器106可配置为CAN控制器，例如，CAN微控制器。所述数据率控制器410可配置为CAN FD控制器，除其他特征之外，可用于检测数据TxD的消息帧的第一部分或第二部分，并进一步用于为根据各个实施例的发射机电路502指示，消息数据帧的第二部分将在第二数据传输模式下发送。
In any case, the data rate controller 410 is included in the transceiver 504 according to various embodiments as shown in FIG.A. Therefore, the controller 106 does not have to be altered, for example no additional terminals have to be provided, since the transceiver 504 according to various embodiments includes the data rate controller 410 and may be able to switch between the first data transmission mode and the second data transmission mode in an autonomous manner. In other words, the transceiver 504 according to various embodiments may not require external inputs in order to decide, whether the transceiver circuit 504 according to various embodiments is to operate in the first or second data transmission mode.
在任何情况下，所述数据率控制器410都包括在图5A所示的根据各个实施例的收发机504内。因此，所述控制器106不需要改变，例如，不需要提供额外端子，因为根据各个实施例的收发机504包括数据率控制器410，并可以自主方式在第一数据传输模式与第二数据传输模式之间切换。换句话说，根据各个实施例的收发机504可不要求使用外部输入端来确定根据各个实施例的收发机504在第一还是第二数据传输模式下运行。
In FIG.A a communication circuit 500 according to various embodiments within a node 102 as illustrated in FIG. is shown including the controller 106 and the transceiver 504 according to various embodiments. The interior of the transceiver 504 according to various embodiments is shown in more detail. The transceiver 504 according to various embodiments includes the receiver circuit 204, the transmitter circuit 502 according to various embodiments and the data rate controller 410. Although the data rate controller 410 and the transceiver circuit 502 are illustrated as separate entities, they may just as well form one component as shown in FIG., where the data rate controller 410 is part of the transmitter circuit 400 according to various embodiments. The separate display is only for ease of illustration.
图5A显示了图1所示的节点102内的根据各个实施例的通信电路500，包括控制器106和根据各个实施例的收发机504。对根据各个实施例的收发机504的内部进行了详细显示。根据各个实施例的收发机504包括接收机电路204、根据各个实施例的发射机电路502和数据率控制器410。对所述数据率控制器410和发射机电路502作为单独实体进行图解，但其也可形成图4所示的一个部件，在该部件中，数据率控制器410属于根据各个实施例的发射机电路400的一部分。单独显示的目的仅在于易于图解。
The data rate controller 410 is configured to determine whether data TxD is currently to be sent at a standard bit rate or at a preconfigured bit rate which may be faster than the standard bit data rate controller 410 may be configured to monitor or analyse the data TxD in order to detecting a state of a message field (also refe rred to as bit rate indication field) within the data TxD to be transmitted. Upon detecting the state of the bit rate indication field within a message (data) frame of the data TxD, the data rate controller 410 may be configured the transmitter circuit 400 to switch from the first data transmission mode into the second data transmission mode by outputting a corresponding output signal H/L to the logic AND-gate 404.
所述数据率控制器410用于确定数据TxD当前以标准比特率发送还是以快于标准比特率的预设比特率发送。所述数据率控制器410可用于监控或分析数据TxD，以检测要传输的数据TxD内的消息字段（还成为比特率表示字段）的状态。检测到数据TxD的消息（数据）帧内的比特率表示字段的状态时，所述数据率控制器410可通过向逻辑与门404输出对应输出信号H/L而将发射机电路400从第一数据传输模式切换到第二数据传输模式。
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