mfr4200 Freescale Semiconductor, Inc, mfr4200 Datasheet - Page 189

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

3.7
The FlexRay communication controller can be connected and controlled by two types of microcontrollers
through the CC MCU interface. Two pins, IF_SEL0 and IF_SEL1, configure the interface for the type of
MCU. The MCU type is selected by IF_SEL0 and IF_SEL1 inputs as shown in
When it leaves the hard reset state, the CC latches the values of the IF_SEL0 and IF_SEL1 signals and
configures the interface for the type of MCU accordingly. The CC does not analyze IF_SEL0 and IF_SEL1
after it has left the hard reset state (see
3.7.1
The MFR4200 asynchronous memory interface is shown in
characteristics and features:
Freescale Semiconductor
•
•
•
Data exchange in AMI mode is controlled by the CE#, WE# and OE# signals.
The MFR4200 AMI is implemented as an asynchronous memory slave module, thus enabling fast
interfacing between the CC and a variety of microcontrollers.
The MFR4200 AMI decodes its internal registers addresses with the help of the chip select signal
CE# and the address lines A[9:1].
Host Controller Interfaces
MFR4200 Asynchronous Memory Interface
If the CC senses the unsupported mode on its IF_SEL pins, it stops all
internal operations, does not perform/respond on any host transactions,
stays in the configuration mode, and does not integrate into the
communication process. The following steps must be taken to select a
correct MCU interface mode.
1. IF_SEL0, IF_SEL1 must be set to the AMI or HCS12 mode.
2. The hard reset signal of the CC must be asserted again.
The address space from 0x0400 to 0x1FFF is reserved. Reading this address
space results in data 0x0000, while writing will not change the memory.
Reading or writing this address space will set the ILLADR bit in CHIER.
will still indicate asserted IFLG bits for the message buffer that has been
included in the FIFO.
Table 3-19. FlexRay CC MCU Interface Configuration
Unsupported
Unsupported
HCS12
Mode
AMI
Section 3.9.1, “Hard Reset
MFR4200 Data Sheet, Rev. 0
NOTE
NOTE
IF_SEL0
0
0
1
1
Figure
IF_SEL1
3-142. This interface has the following
State”).
0
1
0
1
Table
Host Controller Interfaces
3-19.
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