Rainbow Electronics CAN интерфейс - Manual (Page 55)

BOSCH
ROBERT BOSCH GmbH, Postfach 300240, D-7000 Stuttgart 30
Sep. 1991
Part B - page 53
3.2.5 INTERFRAME SPACING
DATA FRAMEs and REMOTE FRAMEs are separated from preceding frames
whatever type they are (DATA FRAME, REMOTE FRAME, ERROR FRAME,
OVERLOAD FRAME) by a bit field called INTERFRAME SPACE. In contrast,
OVERLOAD FRAMEs and ERROR FRAMEs are not preceded by an INTERFRAME
SPACE and multiple OVERLOAD FRAMEs are not separated by an INTERFRAME
SPACE.
INTERFRAME SPACE
contains the bit fields INTERMISSION and BUS IDLE and, for ’error passive’ stations,
which have been TRANSMITTER of the previous message, SUSPEND
TRANSMISSION.
For stations which are not ’error passive’ or have been RECEIVER of the previous
message:
For ’error passive’ stations which have been TRANSMITTER of the previous message:
INTERMISSION
consists of three ’recessive’ bits.
During INTERMISSION the only action to be taken is signalling an OVERLOAD
condition and no station is allowed to actively start transmission of a DATA FRAME or
REMOTE FRAME.
Frame
Bus Idle
INTERFRAME SPACE
Intermission
Frame
Frame
Bus Idle
INTERFRAME SPACE
Intermission
Frame
Suspend Transmission
Interframe Space