mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 192

• Manufacturer Part Number: mfr4300
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

FlexRay Module (FLEXRAYV2)
3.4.16.2
This section provides detailed timing information of the strobe signals with respect to the protocol engine
clock.
The strobe signals display internal PE signals. Due to the internal architecture of the PE, some signals are
generated several PE clock cycles before the actual action is performed on the FlexRay Bus. These signals
are listed in
Other signals refer to events that occurred on the FlexRay Bus some cycles before the strobe signal is
changed. These signals are listed in
in
3.4.17
The FlexRay module provides two timers, which run on the FlexRay time base. Each timer generates a
maskable interrupt when it reaches a configured point in time. Timer T1 is an absolute timer. Timer T2 can
be configured to be an absolute or a relative timer
non-repetitive mode, timer stops if it expires. In repetitive mode, timer is restarted when it expires.
Both timers are active only when the protocol is in
the protocol is not in one of these modes, the timers are stopped. The application must restart the timers
when the protocol has reached the
192
Figure
2. Read STBCSR.
The SEL field provides N and the ENB and STBPSEL fields provides the settings for signal N.
3-138.
FlexRay Bus Event
FlexRay Bus Event
Timer Support
Table 3-11
Strobe Signal Timing
Strobe Signal
Strobe Signal
PE Clock
PE Clock
Figure 3-138. Strobe Signal Timing (type = pulse, clk_offset = +4)
Figure 3-137. Strobe Signal Timing (type = pulse, clk_offset = -2)
with a negative clock offset. An example waveform is given in
POC:normal active
Table 3-11
MFR4300 Data Sheet, Rev. 3
-2
with a positive clock offset. An example waveform is given
.
Both timers can be configured to be repetitive. In the
POC:normal active
+4
or
POC:normal passive
or
POC:normal passive
state.
Freescale Semiconductor
Figure
3-137.
state. If