c6474 aif 问题

// event gen 5
/** configure mask based trigger event to occur every 4 chips for EDMA x'fer (DSP ->
AIF outbound RAM) */
configMaskTrigger[14].timerUsed = CSL_FSYNC_RP3_TIMER;
configMaskTrigger[14].eventGenUsed = CSL_FSYNC_TRIGGER_GEN_5;
configMaskTrigger[14].mask.frameMask = 0;
configMaskTrigger[14].mask.slotMask = 0;
configMaskTrigger[14].mask.chipTerminalCountIndexMask = 0;
configMaskTrigger[14].mask.chipMask = 0x3;
configMaskTrigger[14].mask.sampleMask = 0xFF;
// lag of 8 chips between AIF write and EDMA read
configMaskTrigger[14].offset.slotOffset = 1;
configMaskTrigger[14].offset.chipTerminalCountIndex = 0;
configMaskTrigger[14].offset.chipOffset = 1;
configMaskTrigger[14].offset.sampleOffset = 0;
configMaskTrigger[14].compareValue.slotValue = 0;
configMaskTrigger[14].compareValue.chipValue = 9;
configMaskTrigger[14].compareValue.sampleValue = 0;
请告诉我下在上面这个程序里面compare值和offset值以及最后在EGM_compare寄存器中的值是什么关系？目前我调试DSP和FPGA的AIF接口，用的OBSAI协议，发送和接收状态正常，但是发送和接收的buffer有些数据对不上，请问delta为-700，pi值为750，我的帧同步模块那些参数怎么设置啊？谢谢