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PXS20RM Datasheet, PDF (716/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller | |||
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FlexRay Communication Controller
NOTE
The CC does not provide a memory protection scheme for the
FlexRay memory area.
26.1.5 Features
The CC provides the following features:
⢠FlexRay Communications System Protocol Specification, Version 2.1 Rev A compliant protocol
implementation
⢠FlexRay Communications System Electrical Physical Layer Specification, Version 2.1 Rev A
compliant bus driver interface
⢠single channel support
â FlexRay Port A can be configured to be connected either to physical FlexRay channel A or
physical FlexRay channel B.
⢠FlexRay bus data rates of 10 Mbit/s, 8 Mbit/s, 5 Mbit/s, and 2.5 Mbit/s supported
⢠64 configurable message buffers with
â individual frame ID filtering
â individual channel ID filtering
â individual cycle counter filtering
⢠message buffer header, status and payload data stored in dedicated FlexRay memory area
â allows for flexible and efficient message buffer implementation
â consistent data access ensured by means of buffer locking scheme
â application can lock multiple buffers at the same time
⢠size of message buffer payload data section configurable from 0 up to 254 bytes
⢠two independent message buffer segments with configurable size of payload data section
â each segment can contain message buffers assigned to the static segment and message buffers
assigned to the dynamic segment at the same time
⢠zero padding for transmit message buffers in static segment
â applied when the frame payload length exceeds the size of the message buffer data section
⢠transmit message buffers configurable with state/event semantics
⢠message buffers can be configured as
â receive message buffer
â single buffered transmit message buffer
â double buffered transmit message buffer (combines two single buffered message buffer)
⢠individual message buffer reconfiguration supported
â means provided to safely disable individual message buffers
â disabled message buffers can be reconfigured
⢠two independent receive FIFOs
â one receive FIFO per channel
26-4
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
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