The most important thing is the signal named "Periphclk" ( meaning periphreal clock ) Notice the vertical line is drawn right through the 1/2 point on the rising edge of this signal? All other signals will be time referenced to that line ( 1/2 the rising edge of the clock )
Something else that might be useful is learning how to make timing diagrams for yourself. You can download a student version of TimeGen timing diagram editor here. Download TimeGen Demo
I have never used it, but I have used Timing Designer which I am sure is similar.