TMS570LS1224: troubles with MIBSPI3 to send 3 bytes with CS low

Hi, I need to ask some help. I am trying to configure MIBSPI3 o SPI3 it is the same. To send 3 bytes to a DAC 8771, for configuration etc. But i need to get low CS at start until reach the last byte. I try some configurations like Chip select hold and Chip Select Hold Fc. And that not work.

Using Chip Select Hold I got this

using both hold and FC I got this 

I need something like this, 

The problem was that it has 16bits of data. I try 8 bit in SPI3 but not works. That is why i come back to MIBSPI3

// this is my code to send a command

  uint16 TX_Data_Master[3] = { 0x00, 0x00, 0x00};
  mibspiInit();

    TX_Data_Master[0] = DAC8771_ADD_REG_SEL_BUCK_BOOST;
    TX_Data_Master[1] = 0;
    TX_Data_Master[2] = 1; // bit RST = 1
    mibspiSetData(mibspiREG3, 0 , TX_Data_Master);
    mibspiTransfer(mibspiREG3, 0 );
    while(!mibspiIsTransferComplete(mibspiREG3, 0 ));

thanks in advance