外文翻譯--sja1000--獨立的can控制器

1、黑龍江工程學院本科生畢業(yè)設(shè)計0附錄 A 英文原文SJA1000—Stand-alone CAN controller1. INTRODUCTIONThe SJA1000 is a stand-alone CAN Controller product with advanced features for use in automotive and general industrial applications. It is intend

2、ed to replace the PCA82C200 because it is hardware and software compatible. Due to an enhanced set of functions this device is well suited for many applications especially when systemoptimization, diagnosis and maintenan

3、ce are important.This report is intended to guide the user in designing complete CAN nodes based on the SJA1000. The report provides typical application circuit diagrams and flow charts for programming.2. OVERVIEWThe sta

4、nd-alone CAN controller SJA1000 1 has two different Modes of Operation:1.BasicCAN Mode (PCA82C250 compatible).2.PeliCAN Mode.Upon Power-up the BasicCAN Mode is the default mode of operation. Consequently, existing hardwa

5、re and software developed for the PCA82C250 can be used without any change. In addition to the functions known from the PCA82C250 , some extra features have been implemented in this mode which make the device more attrac

6、tive. However, they do not influence the compatibility to the PCA82C250.The PeliCAN Mode is a new mode of operation which is able to handle all frame types according to CAN specification 2.0B. Furthermore it provides a c

7、ouple of enhanced features which makes the SJA1000 suitable for a wide range of applications.2.1 SJA1000 FeaturesThe features of the SJA1000 can be clustered into three main groups:1.Well-established PCA82C200 FunctionsF

8、eatures of this group have already been implemented in the PCA82C250.2.Improved PCA82C200 FunctionsPartly these functions have already been implemented in the PCA82C250. However, in the SJA1000 they have been improved in

9、 terms of speed, size or performance.3.Enhanced Functions in PeliCAN Mode黑龍江工程學院本科生畢業(yè)設(shè)計2multiplexed address/data bus and controlling of the read/write strobes is handled in this unit. Additionally to the BasicCAN functio

10、ns known from the PCA82C250, new PeliCAN features have been added. As a consequence of this, additional registers and logic have been implemented mainly in this block.Figure 2: Block Diagram SJA1000The Transmit Buffer of

11、 the SJA1000 is able to store one complete message (Extended or Standard). Whenever a transmission is initiated by the host controller the Interface Management Logic forces the CAN Core Block to read the CAN message from

12、 the Transmit Buffer.When receiving a message, the CAN Core Block converts the serial bit stream into parallel data for the Acceptance Filter. With this programmable filter the SJA1000 decides which messages actually are

13、 received by the host controller.All received messages accepted by the acceptance filter are stored within a Receive FIFO. Depending on the mode of operation and the data length up to 32 messages can be stored. This enab

14、les the user to be more flexible when specifying interrupt services and interrupt priorities for the system because the probability of data overrun conditions is reduced extremely.3. SYSTEMFor connection to the host cont

15、roller, the SJA1000 provides a multiplexed address/data bus and additional read/write control signals. The SJA1000 could be seen as a peripheral memory mapped I/O device for the host controller.3.1 SJA1000 ApplicationCon