资料介绍
The acceptance and introduction of serial communication to more and more
applications has led to requirements that the assignment of message identifiers to
communication functions be standardized for certain applications. These applications
can be realized with CAN more comfortably, if the address range that originally has
been defined by 11 identifier bits is enlarged
Therefore a second message format (’extended format’) is introduced that provides a
larger address range defined by 29 bits. This will relieve the system designer from
compromises with respect to defining well-structured naming schemes. Users of CAN
who do not need the identifier range offered by the extended format, can rely on the
conventional 11 bit identifier range (’standard format’) further on. In this case they can
make use of the CAN implementations that are already available on the market, or of
new controllers that implement both formats.
In order to distinguish standard and extended format the first reserved bit of the CAN
message format, as it is defined in CAN Specification 1.2, is used. This is done in such
a way that the message format in CAN Specification 1.2 is equivalent to the standard
format and therefore is still valid. Furthermore, the extended format has been defined
so that messages in standard format and extended format can coexist within the same
network.
This CAN Specification consists of two parts, with
• Part A describing the CAN message format as it is defined in CAN Specification 1.2;
• Part B describing both standard and extended message formats.
In order to be compatible with this CAN Specification 2.0 it is required that a CAN
implementation be compatible with either Part A or Part B.
applications has led to requirements that the assignment of message identifiers to
communication functions be standardized for certain applications. These applications
can be realized with CAN more comfortably, if the address range that originally has
been defined by 11 identifier bits is enlarged
Therefore a second message format (’extended format’) is introduced that provides a
larger address range defined by 29 bits. This will relieve the system designer from
compromises with respect to defining well-structured naming schemes. Users of CAN
who do not need the identifier range offered by the extended format, can rely on the
conventional 11 bit identifier range (’standard format’) further on. In this case they can
make use of the CAN implementations that are already available on the market, or of
new controllers that implement both formats.
In order to distinguish standard and extended format the first reserved bit of the CAN
message format, as it is defined in CAN Specification 1.2, is used. This is done in such
a way that the message format in CAN Specification 1.2 is equivalent to the standard
format and therefore is still valid. Furthermore, the extended format has been defined
so that messages in standard format and extended format can coexist within the same
network.
This CAN Specification consists of two parts, with
• Part A describing the CAN message format as it is defined in CAN Specification 1.2;
• Part B describing both standard and extended message formats.
In order to be compatible with this CAN Specification 2.0 it is required that a CAN
implementation be compatible with either Part A or Part B.
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