Introduction
PXN20 Microcontroller Reference Manual, Rev. 1
1-18 Freescale Semiconductor
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
— 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
— Individual frame ID filtering
— Individual channel ID filtering
— Individual cycle counter filtering
• Message buffer header, status and payload data stored in dedicated FlexRay memory
— Allows for flexible and efficient message buffer implementation
— Consistent data access ensured by means of buffer locking scheme
— Application can lock multiple buffers at the same time
• Message buffers can be configured as:
— Receive message buffer
— Single buffered transmit message buffer
— Double buffered transmit message buffer (combines two single buffered message buffers)
• Individual message buffer reconfiguration supported
• Two independent receive FIFOs
— One receive FIFO per channel
— Up to 255 entries for each FIFO
— Global frame ID filtering, based on both value/mask filters and range filters
— Global channel ID filtering
— 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
– 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
— 1 timer that can be configured to absolute or relative
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