How to Receive compressed audio streams from s/pdif (adsp-21489)

I can successfullyreadpcmstream, but can notread the compressedstream from s/pdif 

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*pDIRCTL = 0;

  SRU(DAI_PB11_O,DIR_I);

  SRU(DIR_CLK_O,SPORT0_CLK_I);

  SRU(DIR_FS_O, SPORT0_FS_I);

  SRU(DIR_DAT_O,SPORT0_DA_I);

  SRU(DIR_CLK_O,DAI_PB09_I);

  SRU(HIGH,PBEN09_I );

  SRU(DIR_FS_O,DAI_PB20_I);

  SRU(HIGH,PBEN20_I );

  // Configure SPORT0 as a reciever

  // externally generating clock and frame sync

  *pDIV0 = 0;

  g_SPORT0A_TCB0.m_CPSPx = DMA_MakeCPx(&g_SPORT0A_TCB1, 1);

  g_SPORT0A_TCB1.m_CPSPx = DMA_MakeCPx(&g_SPORT0A_TCB0, 1);

  *pCPSP0A = g_SPORT0A_TCB0.m_CPSPx;

  *pSPCTL0 = (SPEN_A|    // Enable Channel A

       SLEN16|    // 24-bit word length

       OPMODE|    // Enable I2S Mode

       SDEN_A|    // Enable Channel A DMA

       SCHEN_A);   // Enable Channel A DMA Chaining

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