mfr4200 Freescale Semiconductor, Inc, mfr4200 Datasheet - Page 171

• Manufacturer Part Number: mfr4200
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

It is possible to configure from 0 to 59 buffers as receive message buffers.
3.5.4.2
Transmit message buffers can be configured in the configuration state. Single transmit message buffers for
the dynamic segment can be configured in the configuration state and during normal operation. The
configuration must be done in accordance with the configuration procedure and principles. The CFG bits
in the BUFCSnR of transmit message buffers are 1’s.
The number of transmit message buffers is configurable; however, transmit message buffers cannot be
placed between FIFO buffers or between the host and CC parts of double transmit message buffers.
Transmit message buffers can be configured as single or double transmit message buffers for static and
dynamic segments.
If a message buffer is part of a double transmit message buffer:
It is possible to configure from 0 to 59 message buffers as single transmit message buffers, or 29 double
transmit message buffers, or different mixtures of single and double transmit message buffers (for
example, 15 single transmit message buffers + 22 double transmit message buffers).
3.5.4.3
FIFO Receive buffers can be configured only in the configuration state. First, the host must set the FIFO
size register (see
The host can write the FIFO size register only during the configuration state. The configuration must be
done in accordance with the configuration procedure and principles.
If a configuration includes FIFO buffers, message buffer 0 must be the first FIFO buffer (see
The subset of FIFO buffers must be contiguous.
It is possible to configure up to 59 message buffers as FIFO receive message buffers.
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The host part buffer must be an even number buffer only.
The CC part buffer must be an odd number buffer only. The number of the CC part buffer must be
its host part buffer number + 1.
The host must set only a host part buffers configuration in the configuration state. CC part buffers
of double transmit message buffers will be initialized by the same configuration automatically.
In normal mode of operation host operates only with the host part buffers control and status fields.
It has read-only accesses to the CC part buffers control and status fields (see
“Message Buffer Control, Configuration and Status
Transmit Message Buffer Configuration
Receive FIFO Configuration
The FIFO is configured only via the FSIZR register.
Section 3.2.3.7.1, “FIFO Size Register
MFR4200 Data Sheet, Rev. 0
NOTE
(FSIZR)”).
Register”).
Message Buffer Handling and Operations
Section 3.4.1,
Figure
3-134).
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