TMS320F28379D: I2C NACK from tms320f28379d

Hi guys,

I have used tms320f28379d and configured its I2CA and  I2C-B as Slaves. I have attached the configurations.I am supposed to receive 10 bytes from the Master. But during the transimmison , the TI controller sends a NACK after receiving certain bytes(sometimes 3 or 7, it is not repetitive) and the issue does not occur repeatedly but it is seen often.The same issue is not observed in I2CA. 

I have also attached Picoscope captures of the I2C-B communication where the NACK is observed.

Could someone help to debug the issue.Also, what are the possible situations , a NACK is sent by the TI controller?

void Init_I2CB_FIFO(void)
{
//
// Must put I2C into reset before configuring it
//
//I2C_disableModule(I2CB_BASE);
    I2C_disableModule(I2CB_BASE);
// I2C slave configuration
//
    I2C_setConfig(I2CB_BASE, I2C_SLAVE_RECEIVE_MODE | I2C_SLAVE_SEND_MODE);
    I2C_setDataCount(I2CB_BASE, 10);
    I2C_setBitCount(I2CB_BASE, I2C_BITCOUNT_8);
    I2C_setOwnSlaveAddress(I2CB_BASE, SLAVE_ADDRESS2);
    I2C_setEmulationMode(I2CB_BASE, I2C_EMULATION_FREE_RUN);
    I2C_enableFIFO(I2CB_BASE);
    I2C_clearInterruptStatus(
            I2CB_BASE, I2C_INT_RXFF | I2C_INT_TXFF | I2C_INT_STOP_CONDITION);

//
// Receive FIFO interrupt levels are set to generate an interrupt
// when the 16 byte RX fifo contains 10 or greater bytes of data.
//
    I2C_setFIFOInterruptLevel(I2CB_BASE, I2C_FIFO_TX6, I2C_FIFO_RX10);
    I2C_enableInterrupt(I2CB_BASE,
    I2C_INT_RXFF | I2C_INT_TXFF | I2C_INT_STOP_CONDITION);

//
// Configuration complete. Enable the module.
//
    I2C_enableModule(I2CB_BASE);
}

void Init_I2CA_FIFO(void)
{
//
// Must put I2C into reset before configuring it
//
    I2C_disableModule(I2CA_BASE);
// I2C slave configuration
//
    I2C_setConfig(I2CA_BASE, I2C_SLAVE_RECEIVE_MODE | I2C_SLAVE_SEND_MODE);
    I2C_setDataCount(I2CA_BASE, 10);
    I2C_setBitCount(I2CA_BASE, I2C_BITCOUNT_8);
    I2C_setOwnSlaveAddress(I2CA_BASE, SLAVE_ADDRESS1);
    I2C_setEmulationMode(I2CA_BASE, I2C_EMULATION_FREE_RUN);
    I2C_enableFIFO(I2CA_BASE);
    I2C_clearInterruptStatus(
            I2CA_BASE, I2C_INT_RXFF | I2C_INT_TXFF | I2C_INT_STOP_CONDITION);

//
// Receive FIFO interrupt levels are set to generate an interrupt
// when the 16 byte RX fifo contains 10 or greater bytes of data.
//
    I2C_setFIFOInterruptLevel(I2CA_BASE, I2C_FIFO_TX6, I2C_FIFO_RX10);
    I2C_enableInterrupt(I2CA_BASE,
    I2C_INT_RXFF | I2C_INT_TXFF | I2C_INT_STOP_CONDITION);

//    Configuration complete. Enable the module.

    I2C_enableModule(I2CA_BASE);

}