presented as input of adjustment circuit 700 will require that the pipeline advances one more stage to pipeline stage e 6 before it could be propagated via 2 stages of latency to the output consider an example where the data processor interfaces with trace collection 230 via two data ports the following combination of activities are possible data on port 0 only data on port 1 only and data on both port 0 and port 1 if there are any markers present these markers are received with the data log that came first therefore the following writes are possible in the data log first in first out fifo buffer at any time data from port 0 only data from port 0 only with a marker data from port 1 only data from port 1 only with a marker data from both port 0 and port 1 data from port 0 and port 1 with a marker with the data from port 0 the complete data is not transmitted instead data compressed in differential relative form the data is exclusive ored with the previous data tables 3 and 4 show examples of data compression no data compression is possible in the example of table 4 bytes 0 to 2 of the new data match the corresponding bytes of the previous data therefore in this example only byte 3.