AM13E23019: UART5 Line Timeout and RX Timeout interrupt delays

Part Number: AM13E23019
Other Parts Discussed in Thread: SYSCONFIG

Hi, In my application, I need to check if the Rx line is idle then I need to generate interrupt ASAP. I tried to implement this with the following sysconfig setting 

Exctract from my application 

 #define APP_UART_TRANSFER_SIZE (0x8U)
uint8_t tcf_txbuffer[APP_UART_TRANSFER_SIZE]={'T', 'C', 'F', 'T', 'E', 'S', 'T', ' '};
uint8_t ncf_txbuffer[APP_UART_TRANSFER_SIZE]={'N', 'C', 'F', 'T', 'E', 'S', 'T', ' '};
uint8_t tcf_rxbuffer[APP_UART_TRANSFER_SIZE], ncf_rxbuffer[APP_UART_TRANSFER_SIZE];
uint8_t txCount = 0, rxCount = 0;

us8 index = 0;
uint8_t uart_interrupt_graph[22][100];


main()
{

     /* Testing UART */
    while (txCount < APP_UART_TRANSFER_SIZE)
    {
        DL_UART_transmitData(APP_UART_0_INST, tcf_txbuffer[txCount]);
        txCount++;
    }
    
    while(DL_UART_isBusy(APP_UART_0_INST));
    
    /* Code to generate Break Character */
    DL_UART_enableLINSendBreak(APP_UART_0_INST);
    DL_Common_delayCycles(188330);
    DL_UART_disableLINSendBreak(APP_UART_0_INST); 

    txCount = 0;
    while (txCount < APP_UART_TRANSFER_SIZE)
    {
        DL_UART_transmitData(APP_UART_0_INST, ncf_txbuffer[txCount]);
        txCount++;
    }

    while(1)
    {
    // Superloop
    }
}

// ISRs
__attribute__((section(".TI.ramfunc")))
extern "C" void APP_UART_0_INT_Handler()
{
    g_diagCounters.uartIsrCount++;
    uint32_t interruptStatus = DL_UART_getPendingInterrupt(APP_UART_0_INST);
    uart_interrupt_graph[interruptStatus][index] = 1;
    index++;
    switch (interruptStatus)
    {
    //     /* UART interrupt index for end of transmission */
        case DL_UART_IIDX_EOT_DONE:
        {
            // LOG("UART IIDX: EOT_DONE\r\n");
            BSP_AM13E230_E2::Debug1Pin_Toggle();
            break;
        }
        /* UART interrupt index for Line Time Out */
        case DL_UART_IIDX_LTOUT:
        {
            // LOG("UART IIDX: LTOUT\r\n");
            BSP_AM13E230_E2::Debug3Pin_Toggle();
            break;
        }
        /* UART interrupt index for receive timeout */
        case DL_UART_IIDX_RX_TIMEOUT_ERROR:
        {
            BSP_AM13E230_E2::Debug2Pin_Toggle();
            // LOG("UART IIDX: RX_TIMEOUT_ERROR\r\n");
            break;
        }
    }
}

Note : TX and RX pins are exernally looped back and Logic analyser channel0 is connected to it. The optimisation levels are -O2

Issues : 

1. what does it mean by Calculated RX Timeout Interrupt = 150 ns(in sysconfig) . Shall it depend on the baudrate ? How to decide this ?
2. I am seeing around 1.5 ms of delay for Tx Timeout and Line Timout