Timing gap in onboard looping in the PCI 6543

I want to do onboard looping in the PCI 6543. Is there any timing gap between the loops? Within each loop, the board updates data with each clock strobe. After finishing the last sample of a loop, will it move on to the first sample of a new loop immediately with the next clock strobe? If not, how long does it take to transit from one loop to the next?