PEB 2091
PEF 2091
Functional Description
M 1/2:Monitor message 1. and 2. byte
R 1/2:Monitor response 1. and 2. byte
EOM:End of message: MX=’1’ and MR=’1’ in two consecutive IOM®-2-Frames.
IOM R -2 Frame No.
1
2
3
4
5
6
7
8
9
10
11 12 13 14 15
Tx 1.Byte
Tx 2.Byte
1
MX
0
EOM
DIN
Ack. 1.Byte
Ack. 2.Byte
1
MR
0
EOM
M1 M1 M2 M2 FF FF FF FF FF FF FF FF FF FF FF
Tx 1.Byte Tx 2.Byte
Mon. Data DIN
1
MX
0
EOM
DOUT
Ack. 1.Byte
Ack. 2.Byte
1
MR
0
EOM
Mon. Data DOUT
FF FF FF FF FF FF FF R1 R1 R1 R2 R2 FF FF FF
ITD04230
Figure 28
Idle State
Handshake Protocol with a 2-Byte Monitor Message/Response
After the bits MR and MX have been held inactive (i.e. high) for two or more successive
IOM®-2-frames, the channel is considered idle in this direction.
Transmission Abortion
If no EOM is detected after the first two monitor bytes, or received bytes are not identical
in the first two received frames, transmission will be aborted through receiver by setting
the MR-bit inactive for two or more IOM®-2-frames. The controller reacts with EOM. This
situation is illustrated in figure 29 below.
Semiconductor Group
78
Data Sheet 01.99
INFINEON [ Infineon ]
