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FWD_RD_END (Forward Read with END bytes command)

Return to the SPI Command Table

The FWD_RD_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. 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 command forwarding 3 data words with TXFFLVL set to 2 data words and 2 extra END bytes is

depicted in Figure 7-15.

SDI

SDO

SOUT

0x7102

Data0

Data1

CRC0

STATUS

CRC1

Data0

Data1

END

Data2

END

Figure 7-15. Example of FWD_RD_END command

DATA_RD_CRC (Data Read CRC command)

Return to the SPI Command Table

The DATA_RD_CRC command is used to read data words from the RXFIFO. Only when the received CRC

matches with the calculated CRC over the command word, the device returns the requested number of data

words and the CRC calculated over the data words. When the CRC fails, the SDO is kept at logic HIGH. An

example of DATA_RD_CRC command requesting 4 data words is depicted in Figure 7-16.

SDI

SDO

SOUT

0x8003

CRC0

CRC1

Data0

Data1

Data2

Data3

Figure 7-16. Example of DATA_RD_CRC command

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TLC6989

SLVSHF5 – NOVEMBER 2024

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