NXP Semiconductors PXN2020 - 26.7 Application Information; 26.7.1 Initialization Sequence; 26.7.1.1 Module Initialization

FlexRay Communication Controller (FlexRAY)
PXN20 Microcontroller Reference Manual, Rev. 1
26-152 Freescale Semiconductor
NOTE
The bit rate of 8 Mbit/s is not defined by the FlexRay Communications
System Protocol Specification, Version 2.1 Rev A.
26.7 Application Information
26.7.1 Initialization Sequence
This section describes the required steps to initialize the controller. The first subsection describes the steps
required after a system reset, the second section describes the steps required after preceding shutdown of
the controller.
26.7.1.1 Module Initialization
This section describes the module related initialization steps after a system reset.
1. Configure controller.
a) configure the control bits in the Module Configuration Register (MCR)
b) configure the system memory base address in System Memory Base Address Register
(SYMBADR)
2. Enable the controller.
a) write 1 to the module enable bit MEN in the Module Configuration Register (MCR)
The controller now enters the Normal Mode. The application can commence with the protocol
initialization described in Section 26.7.1.2, Protocol Initialization.
Table 26-117. FlexRay Channel Bit Rate Control
FlexRay Channel
Bit Rate
[Mbit/s]
MCR.BITRATE
pdMicrotick
[ns]
gdSampleClockPeriod
[ns]
pSamplesPerMicrotick
cSamplesPerBit
cStrobeOffset
10.0 000 25.0 12.5 2 8 5
8.0 011 25.0 12.5 2 10 6
5.0 001 25.0 25.0 1 8 5
2.5 010 50.0 50.0 1 8 5