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AWR1243: Processor Radar SDK: About VIP pix clock edge setting in cascade radar demo

Part Number: AWR1243

Hi expert,

In the 4-chip cascade radar demo we see the pix clock edge polarity setting are different for the VIP VIN3A port. Could you please give some details about why we need to use rising edge for this single port as below? 

Thank you.

if (pInstPrm->vipInstId ==  VPS_CAPT_VIP_MAKE_INST_ID(VPS_VIP2, VPS_VIP_S0, VPS_VIP_PORTA))
{
            pPortCfg->comCfg.pixClkEdgePol      =   SYSTEM_EDGE_POL_RISING;
}
else
{
            pPortCfg->comCfg.pixClkEdgePol      =   SYSTEM_EDGE_POL_FALLING;
            Bsp_platformSetVipClkInversion(pInstPrm->vipInstId, TRUE);
}
Regards,
Allen