CP3SP33SMSSLASHNOPB datasheet(175/407 Pages) TI1

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INTERFRAME SPACE

SUSPEND

TRANSMIT

INT

Bus Idle

ANY FRAME

INT = Intermission

Suspend Transmission is only for error passive nodes.

DATA FRAME OR

REMOTE FRAME

Note:

d = dominant

r = recessive

DS026

OVERLOAD FRAME

OVERLOAD

FLAG

OVERLOAD

DELIMITER

END OF FRAME OR

ERROR DELIMITER OR

OVERLOAD DELIMITER

An overload frame can only start at the end of a frame

INTER-FRAME SPACE

OR ERROR FRAME

Note:

d = dominant

r = recessive

DS025

CP3SP33

www.ti.com

SNOSCW5 – MAY 2013

Figure 22-8. Overload Frame

22.2.3.5 Interframe Space

Data and remote frames are separated from every preceding frame (data, remote, error and overload

frames) by the interframe space (see Figure 22-9). Error and overload frames are not preceded by an

interframe space; they can be transmitted as soon as the condition occurs. The interframe space consists

of a minimum of three bit fields depending on the error state of the node.

Figure 22-9. Interframe Space

22.2.4 Error Types

22.2.4.1 Bit Error

A CAN device which is currently transmitting also monitors the bus. If the monitored bit value is different

from the transmitted bit value, a bit error is detected. However, the reception of a “dominant” bit instead of

a “recessive” bit during the transmission of a passive error flag, during the stuffed bit stream of the

arbitration field, or during the acknowledge slot is not interpreted as a bit error.

22.2.4.2 Stuff Error

A stuff error is detected if 6 consecutive bits occur without a state change in a message field encoded with

bit stuffing.

Dual CAN Interfaces

175

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