Texas Instruments TMS570LC4357 User Manual

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SPNU563A–March 2018
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FlexRay Module
26.2.1.1.1.12 Read Transfers
A read transfer is the data transfer from FlexRay message buffer RAM to the system memory of the
microcontroller.
For read transfers the registers Trigger Transfer to System Memory (TTSM), Enable Transfer on Event to
System Memory (ETESM) and Clear on Event to System Memory (CESM) have to be setup.
The amount and type of data to be transferred can be selected as:
• data and header section
• header section only
• data section only
which can be configured on the Transmit Configuration RAM (TCR).
The number of 32 bit words per buffer to be transferred is read from the Payload Length Configured
(RDHS2.PLC) configuration information. This information is part of the header section stored in the
message RAM of the Communication Controller.
26.2.1.1.1.13 Write Transfers
A write transfer is the data transfer from the system memory of the microcontroller to the FlexRay
message buffer RAM.
For write transfers the Trigger Transfer to Communication (TTCC) register has to be setup.
The amount and type of data transferred can be selected as:
• data and header section
• header section only
• data section only
which can be configured on the Transmit Configuration RAM (TCR).
It can be configured in the TCR, if Set Transmission Request Host (STXRH) bit in the Input Buffer
Command Mask (IBCM) of the Communication Controller should be set. This would trigger the transfer to
the FlexRay bus.
If a data and header section transfer is selected, the number of 32 bit words to be transferred is read from
the Payload Length Configured (PLC) configuration information stored in Header2 word in the system
memory.
If a data section only transfer is selected, the number of 32 bit words to be transferred is read from the
Payload Length Configured (RDHS2.PLC) configuration information. This information is part of the header
section stored in the message RAM of the Communication Controller.
26.2.1.1.1.14 Transfer Unit Event Interface
The Transfer Unit Event Control generates transfer trigger signals for transfers in the following cases:
• For transmit (TX) message buffers, a write transfer trigger is generated, if a transmit event occurs. The
configured TX message buffers generate a transfer trigger, except when a Nullframe in static segment
or no frame in the dynamic segment is sent.
• For receive (RX) message buffers, a read transfer trigger is generated, if a receive event occurs in the
static segment.
• For receive (RX) message buffers, a read transfer trigger is generated if a receive event occurs in the
dynamic segment, updated in the current cycle and no Nullframe.
If a buffer is part of the FIFO, no transfer trigger is generated!
When the Transfer Unit is disabled (TUE bit in Global Control Register (GCS/R) is 0), no transfer trigger is
generated, whereas if the Transfer Unit is enabled, but in halt mode (TUH bit and TUE bit in Global
Control Register (GCS/R) are 1), the occurring triggers remain pending and get executed when the
Transfer Unit will be resumed from halt mode.

Texas Instruments TMS570LC4357 Specifications

General

Brand	Texas Instruments
Model	TMS570LC4357
Category	Microcontrollers
Language	English