FlexRay Communication Controller (FlexRAY)
PXN20 Microcontroller Reference Manual, Rev. 1
26-2 Freescale Semiconductor
26.1.3 Color Coding
Throughout this chapter types of items are highlighted through the use of an italicized color font.
FlexRay protocol parameters, constants and variables are highlighted with blue italics. An example is the
parameter gdActionPointOffset.
FlexRay protocol states are highlighted in green italics. An example is the state POC:normal active.
26.1.4 Overview
The controller is a FlexRay communication controller that implements the FlexRay Communications
System Protocol Specification, Version 2.1 Rev A.
The controller has three main components:
• Controller host interface (CHI)
• Protocol engine (PE)
• Clock domain crossing unit (CDC)
A block diagram of the controller with its surrounding modules is given in Figure 26-1.
NOTE
The FlexRay block is not implemented on the PXN21.
TMicrotick
MT Macrotick
MTS Media Access Test Symbol
NIT Network Idle Time
PE Protocol Engine
POC Protocol Operation Control. Each state of the POC is denoted by POC:state
Rx Reception
SEQ Sequencer Engine
TCU Time Control Unit
Tx Transmission
sync frame null frame or message frame with Sync Frame Indicator set to 1
startup frame null frame or message frame with both Sync Frame Indicator and Startup Frame Indicator set to 1
normal frame null frame or message frame with both Sync Frame Indicator and Startup Frame Indicator set to 0
null frame frame with Null Frame Indicator set to 0
message frame frame with Null Frame Indicator set to 1
Table 26-1. List of Terms (continued)
Term Definition
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