Bosch Appliances TTCAN user manual ID28-0, Msk28-0, Xtd, Dir

TTCAN User’s Manual Revision 1.6

manual_about.fm

ID28-0	Message Identifier
	ID28 - ID0		29-bit Identifier (“Extended Frame”).
	ID28 - ID18		11-bit Identifier (“Standard Frame”).
Msk28-0	Identifier Mask
	one	The corresponding identifier bit is used for acceptance filtering.
	zero	The corresponding bit in the identifier of the message object cannot inhibit
		the match in the acceptance filtering.
Xtd	Extended Identifier
	one	The 29-bit (“extended”) Identifier will be used for this Message Object.
	zero	The 11-bit (“standard”) Identifier will be used for this Message Object.

MXtd Mask Extended Identifier

one The extended identifier bit (IDE) is used for acceptance filtering.

zero The extended identifier bit (IDE) has no effect on the acceptance filtering

Note : When 11-bit (“standard”) Identifiers are used for a Message Object, the identifiers of received Data Frames are written into bits ID28 to ID18. For acceptance filtering, only these bits together with mask bits Msk28 to Msk18 are considered.

Dir	Message Direction
	one	Direction = transmit: On TxRqst, the respective Message Object is trans-
		mitted as a Data Frame. On reception of a Remote Frame with matching
		identifier, the TxRqst bit of this Message Object is set (if RmtEn = one).
	zero	Direction = receive: On TxRqst, a Remote Frame with the identifier of this
		Message Object is transmitted. On reception of a Data Frame with match-
		ing identifier, that message is stored in this Message Object.

MDir Mask Message Direction

one The message direction bit (Dir) is used for acceptance filtering.

zero The message direction bit (Dir) has no effect on the acceptance filtering. The Arbitration Registers ID28-0, Xtd, and Dir are used to define the identifier and type of outgoing messages and are used (together with the mask registers Msk28-0, MXtd, and MDir) for acceptance filtering of incoming messages. A received message is stored into the valid Message Object with matching identifier and Direction=receive (Data Frame) or Direction=transmit (Remote Frame). Extended frames can be stored only in Message Objects with Xtd = one, standard frames in Message Objects with Xtd = zero. If a received message (Data Frame or Remote Frame) matches with more than one valid Message Object, it is stored into that with the lowest message number. For details see chapter 4.1.3 Acceptance Filtering of Received Messages.

EoB End of Block

one Single Message Object or last Message Object of a FIFO Buffer Block. zero Message Object belongs to a FIFO Buffer Block and is not the last Mes-

sage Object of that FIFO Buffer Block.

Note : This bit is used to concatenate two ore more Message Objects (up to 32) to build a FIFO Buffer.

For single Message Objects (not belonging to a FIFO Buffer) this bit must always be set to one. For details on the concatenation of Message Objects see chapter 4.2.2.3.

MSC2-0Message Status Count

0-7The actual value of the Message Status Count, read-only in active mode.

Note : The Message Status Count is status information that is generated for periodic Message Objects in Time Triggered Communication (ISO11898-4). It has no function in Event Driven CAN Com- munication (ISO11898-1) and for arbitrating Message Objects in TTCAN.

BOSCH - 25/77 - 11.11.02