TMS320F28379D: pwm ISR not triggered when PWM is counting down in up-down mode

Tool/software:

Hello Experts,

I have configured ePWM11 in up-down mode and trying to enable pwm interrupts when TCBR is zero or period by writing the INTSEL bit as 011 

EPWM_setInterruptSource(EPWM11_BASE ,EPWM_INT_TBCTR_ZERO_OR_PERIOD);

Am I correct is asuming that 2 interrupts will be generated , one when TCBR = 0 and the other when TCBR = Period, for every PWM cycle(marked in red)?

Now , when TCBR is 0, if i check the direction (TBSTS.CTRDIR), am i correct in asuming that the counter will be counting up? And when TCBR is equal to Period, the counter will be counting down?

I tried to verify the above , by checking the direction in the PWM ISR, but it always shows as theough it is counting up, it never counts down, I tried to toggle a GPIO to verify this but is is always low!! 

__interrupt void pwm11_ISR(void)
{
    pwm_CounterDIR = EPWM_getTimeBaseCounterDirection(EPWM11_BASE);
    testTCBR1 = EPWM_getTimeBaseCounterValue(EPWM11_BASE);
	
    if(EPWM_getTimeBaseCounterDirection(EPWM11_BASE))
    {
        GPIO_writePin(46,0);
    }
    else
    {
        GPIO_writePin(46,1);
    }

	testTCBR2 = EPWM_getTimeBaseCounterValue(EPWM11_BASE);
	
    EPWM_clearEventTriggerInterruptFlag(EPWM11_BASE);
	ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);
	Interrupt_clearACKGroup( INTERRUPT_ACK_GROUP3 |
                             INTERRUPT_ACK_GROUP11 );

}

What configuration am i missing here?

If i set the interrupt source as :

EPWM_setInterruptSource(EPWM11_BASE ,EPWM_INT_TBCTR_ZERO);, Then the GPIO is always Low.

Similarly if i set the interrupt source as 

EPWM_setInterruptSource(EPWM11_BASE ,EPWM_INT_TBCTR_PERIOD);, Then the GPIO is always High.

But when i set the interrupt source as 

EPWM_setInterruptSource(EPWM11_BASE ,EPWM_INT_TBCTR_ZERO_OR_PERIOD);, The GPIO is always Low!!,