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D_CAN USER MANUAL
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The D_CAN is a CAN IP module that can be integrated as stand-alone device or as part of
an SoC or ASIC. It is described in VHDL on RTL level， prepared for synthesis. It consists of
the components （see figure 1） Mux， CAN_Core， Message RAM interface， Message
Handler， Registers and Message Object （MO） access， Module Interface.
The D_CAN performs CAN protocol communication according to ISO 11898-1 （identical to
Bosch CAN protocol specification 2.0 A， B）。 The bit rate can be programmed to values up
to 1 MBit/s depending on the used technology. Additional transceiver hardware is required
for the connection to the physical layer （the CAN bus line）。
For communication on a CAN network， individual Message Objects are configured. The
Message Objects and Identifier Masks are stored in the Message RAM.
All functions concerning the handling of messages are implemented in the Message
Handler. Those functions are acceptance filtering， transfer of messages between the
CAN_Core and the Message RAM and the handling of transmission requests as well as the
generation of the module interrupt.
The register set of the D_CAN can be accessed directly by an external CPU via the module
host interface. These registers are used to control/configure the CAN_Core and the
Message Handler and to access the message RAM via the IF1 and IF2 register sets.
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