Features

PXR40 Product Brief, Rev. 1

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

19

•

Supports censorship protection for internal flash memory

•

Provides an option to enable the software watchdog timer

2.5.21

Dual-channel FlexRay controller

The PXR40 contains one dual-channel FlexRay controller. The controller fully implements the FlexRay

Protocol Specification Version 2.1 Rev A. The FlexRay protocol is designed to facilitate implementation

of fault tolerant, time-triggered, and highly dependable control systems by offering a fault tolerant clock

synchronization mechanism. The FlexRay protocol maintains the global time across the functional nodes

of a network with a precision (jitter) of maximum 1 µs at a data rate of 10 Mbit/sec and redundant

communication channels.

The FlexRay controller 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

— 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/sec, 8 Mbit/sec, 5 Mbit/sec, and 2.5 Mbit/sec supported

•

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

•

Size of message buffer payload data section configurable from 0 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

•

Zero padding for transmit message buffers in static segment

— 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

— Receive message buffer

— Single-buffered transmit message buffer

— Double-buffered transmit message buffer (combines two single buffered message buffer)

1. Feature available only on revision 2 release of device.