TMS320F28377D: MASTER(NXP-ARM M4) - 28377 SPI SLAVE , If increase master's clk , do not working.

 Hi, 

We want to use TMS320F28377D SPI Slave mode. 

We already set as SPI Master with NXP ARM MCU(mk60xxxx).

If We set sclk - 15KHz , it work normal.

But if we set scl - 50KHz or higher than 50KHz, (ex 1MHz),  it do not work...

I think Slave can not accept high sclk. because MISO data corrupted at some sclk (between 15KHz and 50KHz).

Please help me~

This is Slave code.

//  9.1 Idle Loop
    for(;;) // Just sit and loop forever
    {
        BackTicker++;

        while(SpiaRegs.SPIFFRX.bit.RXFFST !=1) { }

        Rdata = SpiaRegs.SPIRXBUF;
    }



void spia_initialize()
{
    // Initialize SPI FIFO registers
    SpiaRegs.SPIFFTX.all = 0xE040;
    SpiaRegs.SPIFFRX.all = 0x2044;
    SpiaRegs.SPIFFCT.all = 0x0;

    // Set reset low before configuration changes
    // Clock polarity (0 == rising, 1 == falling)
    // 16-bit character
    // Disable loop-back
    SpiaRegs.SPICCR.bit.SPISWRESET = 0;
    SpiaRegs.SPICCR.bit.CLKPOLARITY = 0;
    SpiaRegs.SPICCR.bit.SPICHAR = (16-1);
    SpiaRegs.SPICCR.bit.SPILBK = 0;

    // Enable master (0 == slave, 1 == master)
    // Enable transmission (Talk)
    // Clock phase (0 == normal, 1 == delayed)
    // SPI interrupts are disabled
    SpiaRegs.SPICTL.bit.MASTER_SLAVE = 0;
    SpiaRegs.SPICTL.bit.TALK = 1;
    SpiaRegs.SPICTL.bit.CLK_PHASE = 0;
    SpiaRegs.SPICTL.bit.SPIINTENA = 0;

    // Set the baud rate
    SpiaRegs.SPIBRR.bit.SPI_BIT_RATE = ((200E6 / 4) / 500E3) - 1;

    // Set FREE bit
    // Halting on a breakpoint will not halt the SPI
    SpiaRegs.SPIPRI.bit.FREE = 1;

    // Release the SPI from reset
    SpiaRegs.SPICCR.bit.SPISWRESET = 1;
}


//  End of file.

this is normal and abnormal(BLUE-MISO line do not working) scope 

yellow - sclk

red - /cs

blue - MISO

green - MOSI