PXR40RM Datasheet, PDF (721/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

FlexRay Communication Controller (FLEXRAY)
globally disabled, i.e. the SFFE control bit in the Module Configuration Register (MCR) is cleared, all
received synchronization frames are considered for clock synchronization. If a received synchronization
frame did not pass at least one of the two filters, this frame is processed as a normal frame and is not
considered for clock synchronization.
22.6.15.1 Sync Frame Acceptance Filtering
The synchronization frame acceptance filter is implemented as a value-mask filter. The value is configured
in the Sync Frame ID Acceptance Filter Value Register (SFIDAFVR) and the mask is configured in the
Sync Frame ID Acceptance Filter Mask Register (SFIDAFMR). A received synchronization frame with
the frame ID FID passes the sync frame acceptance filter, if Equation 22-24 or Equation 22-25evaluates to
true.
MCRSFFE = 0
Eqn. 22-24
ID & SFIDAFMRFMSK = SFIDAFVRFVAL & SFIDAFMRFMSK
NOTE
Sync frames are transmitted in the static segment only. Thus FID <= 1023.
Eqn. 22-25
22.6.15.2 Sync Frame Rejection Filtering
The synchronization frame rejection filter is a comparator. The compare value is defined by the Sync
Frame ID Rejection Filter Register (SFIDRFR). A received synchronization frame with the frame ID FID
passes the sync frame rejection filter if Equation 22-26 or Equation 22-27 evaluates to true.
MCRSFFE = 0
Eqn. 22-26
FID  SFIDRFRSYNFRID
NOTE
Sync frames are transmitted in the static segment only. Thus FID <= 1023.
Eqn. 22-27
22.6.16 Strobe Signal Support
The controller provides a number of strobe signals for observing internal protocol timing related signals
in the protocol engine. The signals are listed and described in Table 22-12.
22.6.16.1 Strobe Signal Assignment
Each of the strobe signals listed in Table 22-12 can be assigned to one of the four strobe ports using the
Strobe Signal Control Register (STBSCR). To assign multiple strobe signals, the application must write
multiple times to the Strobe Signal Control Register (STBSCR) with appropriate settings.
To read out the current settings for a strobe signal with number N, the application must execute the
following sequence.
1. Write to STBSCR with WMD = 1 and SEL = N. (updates SEL field only)
Freescale Semiconductor
PXR40 Microcontroller Reference Manual, Rev. 1
22-137