This section provides some helpful hints if you are migrating from the eCAN module to the DCAN module. DCAN follows a very different register structure compared to eCAN and hence code written for one module cannot be migrated to another. The following section highlights the differences, but also illustrates the functional similarities between the two modules.

The following features are available in DCAN that are not available in eCAN:

• Parity check mechanism for all RAM modules.
• Automatic Retransmission (upon loss of arbitration) can be disabled.
• Silent mode (Node listens passively).
• Mailbox RAM may be combined to form FIFO buffers.
• Data can be monitored on CANTX pin in self-test mode.

The following are the features that are available in eCAN that are not available in DCAN:

• Timestamping of messages.
• Transmission priority configuration (TPL).
• Data-byte order configuration (DBO).
• Direct access to the mailbox RAM by the CPU - In DCAN, mailbox RAM is accessed through the Interface (IFx) registers. The IFx registers may be thought of as a "window" through which the mailbox RAM is accessed.

Table 4-2 shows the equivalent registers and bit-fields in eCAN and DCAN and also some functional differences.