mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 169

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

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 in order to
ensure data consistency. The states for the commit side of a double transmit message buffer are given in
Figure
transmit message buffer are given in
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
This section describes the transmit message buffer states and provides a state diagram.
Freescale Semiconductor
Region
MSG
CFG
CFG
ITX
SS
SR
SS
TX
3-123. A description of the states is given in
Message Buffer States
Table 3-101. Double Transmit Message Buffer Access Regions Description
Application
read/write
read/write
read/write
Access
-
-
-
-
-
Type
read/write
write-only
write-only
read-only
read-only
Module
Figure
-
-
-
MFR4300 Data Sheet, Rev. 3
3-124. A description of the states is given in
Message Buffer Configuration
Message Buffer Data and Control access
Internal Message Transfer.
Slot Status Update
Message Buffer Configuration
Message Buffer Search
Internal Message Transfer, Message Transmission
Slot Status Update
Transmit Side
Commit Side
Table
3-103. The states for the transmit side of a double
Description
FlexRay Module (FLEXRAYV2)
Table
3-103. The
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