mfr4200 Freescale Semiconductor, Inc, mfr4200 Datasheet - Page 123

• Manufacturer Part Number: mfr4200
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

3.2.3.6.14
Address EMB0R=0x360 … EMB15R=0x37E
Reset
These registers hold the sync frame arrival time measured in microticks relative to the slot start boundary.
Registers EMB[0:15]R contain all measurement values from channel B for the even communication cycle.
As the transmission start sequence length is given in bits, it must be converted to µT by multiplying it by
the bit duration. As the channel information is not available for the list of sync frame arrival times, the CC
standardizes the values based on the channel with the larger delay compensation value; thereby, the frame
arrival time is always positive.
A sync frame arrival time of 0 in one of the measurement registers denotes an invalid time difference. For
example, if, in a given slot, only a sync frame on channel A has been received, the corresponding EMBnR
will hold the value 0.
Freescale Semiconductor
EMB15
EMB7
15
rh
rh
7
undefined state
Even Measurement Channel B n Register, n = [0:15] (EMBnR)
To get the time difference based on the expected time reference point, one
must subtract the nominal action point offset in microticks, the frame start
sequence length and the delay compensation according to the formula
below:
Time difference = (EMAnR, EMBnR, OMAnR, or OMBnR) – NMLR * SSAPOR
EMB14
EMB6
14
rh
rh
6
Figure 3-86. Even Measurement Channel B n Register, n = [0:15]
EMB13
EMB5
13
rh
rh
5
– TSSLR * BDR – max(DCAR,DCBR) – 4
MFR4200 Data Sheet, Rev. 0
EMB12
EMB4
12
rh
rh
4
NOTE
EMB11
EMB3
11
rh
rh
3
EMB10
EMB2
10
rh
rh
2
Memory Map and Registers
EMB9
EMB1
rh
rh
9
1
Eqn. 3-11
EMB8
EMB0
rh
rh
8
0
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