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TC1784
FlexRay™ Protocol Controller (E-Ray)
User´s Manual
20-4
V1.1, 2011-05
E-Ray, V3.13
Input Buffer (IBF)
For write access to the Message Buffers configured in the Message RAM, the Host can
write the Header and Data Section for a specific Message Buffer to the Input Buffer. The
Message Handler then transfers the data from the Input Buffer to the selected Message
Buffer in the Message RAM.
Because the Input Buffer (IBF) Scheme does only allow to write the entire Message
Frame, not only parts of it, the number of IBF has been increased from originally 2 to 4.
This enables to fill the buffer partly and at the end request transfer into Message RAM.
Therefore 2 extra bits allow to switch between the two banks of IBF and one status bit
signals the IBF currently active for Host writes.
Output Buffer (OBF)
For read access to a Message Buffer configured in the Message RAM the Message
Handler transfers the selected Message Buffer to the Output Buffer. After the transfer
has completed, the Host can read the Header and Data Section of the transferred
Message Buffer from the Output Buffer.
Message Handler (MHD)
The E-Ray Message Handler controls data transfers between the following components:
•
Input / Output Buffer and Message RAM
•
Transient Buffer RAMs of the two FlexRay™ Protocol Controllers and Message RAM
Message RAM (MRAM)
The Message RAM consists of a single-ported RAM that stores up to 128 FlexRay™
Message Buffers together with the related configuration data (Header and Data
Partition).
Transient Buffer RAM (TBF 1/2)
Stores the Data Section of two complete messages.
FlexRay™ Channel Protocol Controller (PRT A/B)
The FlexRay™ Channel Protocol Controllers consist of shift register and FlexRay™
protocol FSM. They are connected to the Transient Buffer RAMs for intermediate
message storage and to the physical layer via bus driver BD.
They perform the following functionality:
•
Control and check of bit timing
•
Reception and transmission of FlexRay™ Frames and symbols
•
Check of Header CRC
•
Generation / check of Frame CRC
Содержание TC1784
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