TM4C1294KCPDT: EK-TM4C1294XL

I am using a EK-TM4C1294XL board  and need to generate a 5 Mhz signal from one of its GPIO lines.  I am using TIMERA and am able to generate a 1.17Mhz signal through a GPIO line.  My TIMERA ISR only has the two following lines:

g_ui32Flags = 1 - g_ui32Flags;

GPIOPinWrite(GPIO_PORTL_BASE,GPIO_PIN_0, g_ui32Flags);

Is there a way to generate a 5Mhz signal?  I assumed that with a system clock of 120Mhz I would be able to do this but I would like to know if this is possible even if I have to do this in some other fashion.

Thanks for your help.