Calculate Maximum with DSP builder

try using a comparator, a delay, and a counter. for each "packet" start the counter and initialize the delay to 0. compare between each value of the packet stream and the value in the delay. use the output of the comparator to be the enable pin for the delay, so you can store the input data if the comparison is true. when the counter runs (and the packet is done) you can read the delay value which should be the maximum.