PXN20RM Datasheet, PDF (616/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

FlexRay Communication Controller (FlexRAY)
Term
T
MT
MTS
NIT
PE
POC
Rx
SEQ
TCU
Tx
sync frame
startup frame
normal frame
null frame
message frame
Table 26-1. List of Terms (continued)
Definition
Microtick
Macrotick
Media Access Test Symbol
Network Idle Time
Protocol Engine
Protocol Operation Control. Each state of the POC is denoted by POC:state
Reception
Sequencer Engine
Time Control Unit
Transmission
null frame or message frame with Sync Frame Indicator set to 1
null frame or message frame with both Sync Frame Indicator and Startup Frame Indicator set to 1
null frame or message frame with both Sync Frame Indicator and Startup Frame Indicator set to 0
frame with Null Frame Indicator set to 0
frame with Null Frame Indicator set to 1
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.
26-2
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor