sys·to·le (sîs¹te-lê) noun
The rhythmic contraction of the heart, especially of the ventricles, by which blood is driven through the aorta and pulmonary artery after each dilation or diastole.
[Greek sustolê, contraction, from sustellein, to contract. See systaltic.]
— sys·tol¹ic (sî-stòl¹îk) adjective
American Heritage Dictionary
Data flows from memory in a rhythmic fashion, passing through many processing elements before it returns to memory.