LTC6813 Is not responding SPI.

RL78/F13 Is MASTER  and LTC6813 is SLAVE ........ LTC6813 Is not responding, I'm using LTC6820 as interface board to convert isoSPI TO SPI,  I'm unable to receive the DATA FROM SLAVE BOARD(LTC6820), but I can transmit the DATA.

if STM32F429 is master it is working fine, the slave is responding. 

I checked SIP MISO AND MOSI, BY Making  Renesas RL78/F13  As  Master and STM32F429 AS Slave,  here both TX (MOSI)and RX(MISO) are working.

Thank you. 

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