mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 129

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

Freescale Semiconductor
LCKT
DVAL
Field
MBIE
CMT
DUP
EDT
11
10
9
8
4
3
Commit for Transmission — This bit applies only to transmit message buffers and indicates whether the
message buffer contains valid data that are ready for transmission. Both the application and the FlexRay module
can modify this bit.
0 Message buffer does not contain valid data.
1 Message buffer contains valid data.
Enable/Disable Trigger — This trigger bit is used to enable and disable a message buffer. The message buffer
enable is triggered when the application writes ‘1’ to this bit and the message buffer is disabled, i.e. the EDS
status bit is ‘0’. The message buffer disable is triggered when the application writes ‘1’ to this bit and the message
buffer is enabled, i.e. the EDS status bit is ‘1’.
0 No effect
1 message buffer enable/disable triggered
Note: If the application writes ‘1’ to this bit, the write access to all other bits is ignored.
Lock/Unlock Trigger — This trigger bit is used to lock and unlock a message buffer. The message buffer lock is
triggered when the application writes ‘1’ to this bit and the message buffer is not locked, i.e. the LCKS status bit
is ‘0’. The message buffer unlock is triggered when the application writes ‘1’ to this bit and the message buffer is
locked, i.e. the LCKS status bit is ‘1’.
0 No effect
1 Trigger message buffer lock/unlock
Note: If the application writes ‘1’ to this bit and ‘0’ to the EDT bit, the write access to all other bits is ignored.
Message Buffer Interrupt Enable — This control bit defines whether the message buffer will generate an
interrupt request when its MBIF flag is set.
0 Interrupt request generation disabled
1 Interrupt request generation enabled
Data Updated — This status bit applies only to receive message buffers. It is always ‘0’ for transmit message
buffers. This bit provides information whether the frame header in the message buffer header field and the
message buffer data field were updated. See
description of the update condtions.
0 Frame Header and Message buffer data field not updated.
1 Frame Header and Message buffer data field updated.
Data Valid — The semantic of this status bit depends on the message buffer type and transfer direction.
0 message buffer data field contains no valid frame data
1 message buffer data field contains valid frame data
0 Message transferred for the first time.
1 Message will be transferred again.
0 Message transferred for the first time.
1 Message will be transferred again.
• Application: The application sets this bit to indicate that the transmit message buffer contains valid data ready
• FlexRay module: The FlexRay module clears this bit when the message buffer data are no longer valid for
• Receive Message Buffer: Indicates whether the message buffer data field contains valid frame data. See
• Single Transmit Message Buffer: Indicates whether the message is transferred again due to the state
• Double Transmit Message Buffer: For the commit side it is always ‘0’. For the transmit side it indicates whether
for transmission. The application clears this bit to indicate that the message buffer data are no longer valid for
transmission.
transmission.
Section 3.4.6.3.4, “Message Buffer Status
transmission mode of the message buffer.
the message is transferred again due to the state transmission mode of the message buffer.
Table 3-75. MBCCSRn Field Descriptions (Sheet 2 of 3)
MFR4300 Data Sheet, Rev. 3
Message Buffer Control
Message Buffer Status
Update” for a detailed update description of the update conditions.
Section 3.4.6.3.4, “Message Buffer Status
Description
FlexRay Module (FLEXRAYV2)
Update” for a detailed
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