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NVIC first cycle operation

Note: This was originally posted on 10th May 2010 at http://forums.arm.com

Hi,
I have read the Arm_cortexm3_r1p1_trm.pdf for NVIC understanding. In that one sentence is given on page 5-13 "The NVIC indicates to the processor core, in the cycle after INTISR[2] was received,that an interrupt has been received, and the processor initiates the stack push and vector fetch in the following cycle." What is the reason to start the operation in the next cycle, not in the same cycle?