LPC2129 Task Activation At 200Hz?

Hi, I’m designing an acquisition board based on an LPC2129 running at 60Mhz. One of the requirement for this board is to perform data acquisition at 200Mhz, at the task level… Using FreeRTOS, what is the worst case activation time for a task, say from the time a semaphore is given from an interrupt, handled by the kernel and the task is activated? Does 200Mhz activation time for this processor at this clock frequency seem too high for FreeRTOS? I’ve done similar acquisition at this rate (and even higher) using vxWorks, though that was on a 750Mhz PPC. On that specific processor using vxWORK the activation time was about 4-7us. Thanks, Jean