PSOC5 PWM Maximum Usable Duty Cycle?

I seem to be running into an issue, where I can't get my PWM to give me a real duty cycle above 90%, regardless of what I set the compare value to.  Am I doing something wrong or is this a limit of the device?

Device:CY8C5888AXI-LP096,

PWM Module: v 3.30, UDB mode, clocked with 64MHz Bus Clock

Can anyone help?

Thanks!

Scott