TLC6989 datasheet(28/72 Pages) TI1

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FWD_WR_END (Forward Write with END bytes command)

Return to the SPI Command Table

The FWD_WR_END command is used to transmit data words by the CCSI controller in the device. All the data

words received by the SPI peripheral are stored on the TXFIFO. If one or more of the following conditions is met,

the CCSI controller starts transmitting.

• The number of words stored on the TXFIFO reach TXFFLVL

• All the data words of the SPI command have been received

This means that the CRC does not impact the start of this transmission. When the received CRC does not match

the calculated CRC over the command word and data words, the FAULT pin is pulled low (when not masked)

and the flag FLAG_SPI_CRC is set. After all the data words have been transmitted by the CCSI controller, the

specified number of extra END bytes are appended. The transmission of data words and the transmission of

the extra END bytes are considered as 2 separate CCSI commands. This SPI command supports up to 31

data words and returns the STATUS register and the CRC calculated over the STATUS register. An example of

FWD_WR_END command forwarding 2 data words and 1 extra END bytes is depicted in Figure 7-13. Note that

in this example the TXFFLVL is set to 2 words or higher.

SDI

SDO

SOUT

0x5101

Data0

Data1

CRC0

STATUS

CRC1

Data0

Data1

END

Figure 7-13. Example of FWD_WR_END command

FWD_RD_END_CRC (Forward Read CRC with END bytes command)

Return to the SPI Command Table

The FWD_RD_END_CRC command is used to transmit data words by the CCSI controller in the device. All the

data words received by the SPI peripheral are stored on the TXFIFO. Only when the received CRC matches

with the calculated CRC over the command word and data words, the CCSI controller starts to transmit. This

means that the TXFFLVL does not impact the start of this transmission. After all the data words have been

transmitted by the CCSI controller, the specified number of extra END bytes are appended. The transmission

of data words and the transmission of the extra END bytes are considered as 2 separate CCSI commands.

All the data words that are received by the CCSI peripheral for this command are stored on the RXFIFO. This

SPI command supports up to 32 data words and returns the STATUS register and the CRC calculated over

the STATUS register. An example of FWD_RD_END_CRC command forwarding 2 data words and 1 extra END

bytes is depicted in Figure 7-14.

SDI

SDO

SOUT

0x6081

Data0

Data1

CRC0

STATUS

CRC1

Data0

Data1

END

Figure 7-14. Example of FWD_RD_END_CRC command

TLC6989

SLVSHF5 – NOVEMBER 2024

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