Related to system clock rate

Hi,

I have a question related to system clock. The system clock
rate on my board is set to 50 by using the sysClkRateSet(50)
function.
After this if I call taskDelay(50), my task gets waku up
exactly after 1 sec but if I call taskDelay(60 * 50), my task gets
wakeup few seconds before the 1 minuite:

o/p of one second delay
-----------------------------------

tick value : 50
Before sleeping : 09/08/2008 14:07:58.313208230
After sleeping : 09/08/2008 14:07:59.313208230

Before sleeping : 09/08/2008 14:07:59.313208230
After sleeping : 09/08/2008 14:08:00.313208230

Before sleeping : 09/08/2008 14:08:00.313208230
After sleeping : 09/08/2008 14:08:01.313208230

o/p of one minute delay
----------------------------------

tick value : 50
sleeping time : 3000

Before sleeping : 11/08/2008 17:40:26.332555930
After sleeping : 11/08/2008 17:41:26.312539720

Before sleeping : 11/08/2008 17:41:26.312539720
After sleeping : 11/08/2008 17:42:26.312540670


Please help why taskDelay(60 * 50) is waking up my task few
nanoseconds before the actual 1 min. How can I achive the required
granualarity.

Thanks,
Naresh.
.

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