FlexRay Module (FLEXRAYV4)
MFR4310 Reference Manual, Rev. 2
Freescale Semiconductor 169
The trigger bits MBCCSRn.EDT and MBCCSRn.LCKT, and the interrupt enable bit MBCCSRn.MBIE
are not under access control and can be accessed from the application at any time. The status bits
MBCCSRn.EDS and MBCCSRn.LCKS are not under access control and can be accessed from the
FlexRay module at any time.
The interrupt flag MBCCSnR.MBIF is not under access control and can be accessed from the application
and the FlexRay module at any time. FlexRay module set access has higher priority.
The FlexRay module restricts its access to the regions, depending on the current state of the corresponding
part of the double transmit message buffer. The application must adhere to these restrictions to ensure data
consistency. The states for the commit side of a double transmit message buffer are given in Figure 3-122.
A description of the states is given in Table 3-103. The states for the transmit side of a double transmit
message buffer are given in Figure 3-123. A description of the states is given in Table 3-103. The
description tables also provide the access scheme for the access regions.
The status bits MBCCSRn.EDS and MBCCSRn.LCKS provide the application with the required message
buffer status information. The internal status information is not visible to the application.
3.4.6.4.2 Message Buffer States
This section describes the transmit message buffer states and provides a state diagram.
Table 3-101. Double Transmit Message Buffer Access Regions Description
Access Description
Region
Type
Application Module
Commit Side
CFG read/write - Message Buffer Configuration
MSG read/write - Message Buffer Data and Control access
ITX - read/write Internal Message Transfer.
SS - write-only Slot Status Update
Transmit Side
CFG read/write - Message Buffer Configuration
SR - read-only Message Buffer Search
TX - read-only Internal Message Transfer, Message Transmission
SS - write-only Slot Status Update
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