The TTCAN IP module is a Time Triggered Controller Area Network IP module that can be integrated as stand-alone device or as part of an ASIC. It is described in VHDL on RTL level, prepared for synthesis.

The TTCAN IP module performs CAN protocol communication according to ISO 11898-1 (identical to Bosch CAN specification 2.0 parts A and B) and according to ISO 11898-4 ("Time Triggered Communication on CAN"). The bitrate can be programmed to values up to 1MBit/s depending on the used technology. For the connection to the physical layer additional transceiver hardware is required.

The TTCAN IP module provides all features of time triggered communication that are specified in ISO 11898-4, including event synchronized time triggered communication, global system time, and clock drift compensation. For communication on a CAN network, individual Message Objects are configured. The Message Objects and Identifier Masks are stored in the Message RAM. The time triggers defining the transmission schedule are stored in the Trigger RAM.

All functions concerning the handling of messages are implemented in the Message Handler. Those functions are the 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.

All functions concerning the time schedule and the global system time are implemented in the Frame Synchronisation Entity FSE.

The register set of the TTCAN IP module can be accessed directly by an external CPU via the module interface. These registers are used to control/configure the CAN Core and the Message Handler and to access the single-ported Message RAM. The module interfaces delivered with the TTCAN module can easily be replaced by a customized module interface adapted to the needs of the user.

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