1.For each read we need one CAS and one RAS.
	2.Once data is present, CAS & RAS must be turned off.
	3.CAS & RAS must recover (precharge) before the next read.
	4.Latency is sum of Access time and cycle time.
	5.Access time is from Row Address signal to Data out.
	6.Cycle time is recovery time.  I.e. RAS precharge.
	1.  CAS for Col 2 can not start until Data 1 is gone.