To enable Control Word(Fast C&M)Aif2 configuration on two DSPs in Chain Topology

Hello,

We are working on TCI6670 evm

In our software, Aif2 has been configured for 20 MHz LTE CPRI 4x,2 AxC(Two DSPs in Chain Topology),that is -

<<DSP0-->DSP1-->"Serdes Loopback Enabled at DSP1">>

Now, we need to send control word(Fast C&M) from both dsps- DSP0 and DSP1.

Referring to section 9.1.4 of Aif2 user guide,following is configured to enable sending of control word data from both DSP0 and DSP1, connected in chain topology-

1.For both DSP0 and DSP1 -

PeLinkSetup.PePackDmaCh[0] = 124;

PeLinkSetup.bEnablePack[0] = TRUE;

2.Being specified in UG, cpri cw lut setup could be differently setup for DSP0 and DSP1 to split control word BW,

So, for both PE and PD module,

On DSP1 -           

    for(i = 0; i < 256; i++)  /*cpri cw lut setup*/

                {

                                if (((i >= 20) && (i < 64)) || ((i >= 84) && (i < 128)) )

                                {

                                                PeLinkSetup.CpriCwChannel[i] = 0;

                                                PeLinkSetup.bEnableCpriCw[i] = TRUE;

                                }

                }

On DSP0 -           

    for(i = 0; i < 256; i++)  /*cpri cw lut setup*/

                {

                if (((i>= 148) && (i < 192)) || ((i >= 212) && (i < 256))) {

                                                PeLinkSetup.CpriCwChannel[i] = 0;

                                                PeLinkSetup.bEnableCpriCw[i] = TRUE;

                                }

                }

3.Similarly PdLinkSetup is configured as in point 1. and 2.

3. With SERDES loopback enabled at DSP1, I observe that I am able to receive DSP1 control word. But I am unable to receive DSP0 control word.

Please advise if we missed out something else in Aif2 configuration to enable Control Word on both dsps together - DSP0 as well as DSP1

Regards,

Jeanne