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TMDSLCDK6748: Unavailability of the SPI0_CSn pin output

Part Number: TMDSLCDK6748

From the schematics document provided by TI, the SPI0_CSn pins are connected to the LAN chip, U23. They are not available in the output headers. I require a 4 wire SPI communication for my application. Is it possible to use the SPI0 communication in 3 wire mode (ie, SIMO, SOMI, SCLK) and providing the CSn using the GPIO pins available ? What are the other possible solutions ?

with  regards
Harikrishnan R S

.Thank you .