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PXN20RM Datasheet, PDF (60/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller | |||
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Introduction
1.7.24 Dual-Channel FlexRay Controller (FR)
The dual-channel FlexRay controller features the following:
⢠Full implementation of FlexRay Protocol Specification 2.1, RevA
⢠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, 8, 5, and 2.5 Mbit/s supported
⢠Up to 128 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
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
⢠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 buffers)
⢠Individual message buffer reconfiguration supported
⢠Two independent receive FIFOs
â One receive FIFO per channel
â Up to 255 entries for each FIFO
â Global frame ID filtering, based on both value/mask filters and range filters
â Global channel ID filtering
â Global message ID filtering for dynamic segment
⢠Size of message buffer payload data 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
⢠Support for independent internal clock source provided to module from a separate external 40 MHz
crystal
⢠1 absolute timer
â 1 timer that can be configured to absolute or relative
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PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
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