TMS320F28379D: PWM的同步SYNC信号与PWM的相对位置对不上

PWM的相关配置如下：    
EPWM_setClockPrescaler(EPWM1_BASE, EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);

    EPWM_setTimeBasePeriod(EPWM1_BASE, INV_PWM_PERIOD);
    EPWM_setTimeBaseCounter(EPWM1_BASE, 0U);
    EPWM_setTimeBaseCounterMode(EPWM1_BASE, EPWM_COUNTER_MODE_UP_DOWN);

    EPWM_disablePhaseShiftLoad(EPWM1_BASE);
    EPWM_setPhaseShift(EPWM1_BASE, 0U);
    EPWM_setSyncOutPulseMode(EPWM1_BASE, EPWM_SYNC_OUT_PULSE_ON_COUNTER_ZERO);

    // Set up shadowing
    EPWM_setCounterCompareShadowLoadMode(EPWM1_BASE, EPWM_COUNTER_COMPARE_A, EPWM_COMP_LOAD_ON_CNTR_PERIOD);

    // Set Compare values
    EPWM_setCounterCompareValue(EPWM1_BASE, EPWM_COUNTER_COMPARE_A, 0);

    // Set actions
    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

    // Set dead-band - Use EPWMA as the input for both RED and FED
    EPWM_setRisingEdgeDeadBandDelayInput(EPWM1_BASE, EPWM_DB_INPUT_EPWMA);
    EPWM_setFallingEdgeDeadBandDelayInput(EPWM1_BASE, EPWM_DB_INPUT_EPWMA);

    // Set dead-band - Set the RED and FED values
    EPWM_setFallingEdgeDelayCount(EPWM1_BASE, INV_PWM_DB);
    EPWM_setRisingEdgeDelayCount(EPWM1_BASE, INV_PWM_DB);

    // Set dead-band - Do not invert the delayed outputs (AH)
    EPWM_setDeadBandDelayPolarity(EPWM1_BASE, EPWM_DB_RED, EPWM_DB_POLARITY_ACTIVE_HIGH);
    EPWM_setDeadBandDelayPolarity(EPWM1_BASE, EPWM_DB_FED, EPWM_DB_POLARITY_ACTIVE_LOW);

    // Set dead-band - Use the delayed signals instead of the original signals
    //EPWM_setDeadBandDelayMode(EPWM1_BASE, EPWM_DB_RED, true);
    //EPWM_setDeadBandDelayMode(EPWM1_BASE, EPWM_DB_FED, true);

    EPWM_setDeadBandDelayMode(EPWM1_BASE, EPWM_DB_RED, false);
    EPWM_setDeadBandDelayMode(EPWM1_BASE, EPWM_DB_FED, false);
    

    //Set Initialize State
    EPWM_setActionQualifierContSWForceAction(EPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_SW_OUTPUT_LOW);
    EPWM_setCounterCompareShadowLoadMode(EPWM1_BASE, EPWM_COUNTER_COMPARE_A, EPWM_COMP_LOAD_ON_CNTR_PERIOD);
    EPWM_setActionQualifierContSWForceShadowMode(EPWM1_BASE, EPWM_AQ_SW_SH_LOAD_ON_CNTR_ZERO_PERIOD);

SYNC的配置如下
    SysCtl_setSyncOutputConfig(SYSCTL_SYNC_OUT_SRC_EPWM1SYNCOUT);
    XBAR_setOutputMuxConfig(XBAR_OUTPUT1, XBAR_OUT_MUX14_EXTSYNCOUT);
    XBAR_enableOutputMux(XBAR_OUTPUT1, XBAR_MUX14);
    XBAR_invertOutputSignal(XBAR_OUTPUT1, TRUE);
    GPIO_setPinConfig(GPIO_58_OUTPUTXBAR1);