Going thru the SDram results
starting at addr 0 sam_addr 1  going 4 times
        0
	1	left_s   sam_addr - 1	sdram 0
	2	sam_s	 sam_addr 	sdram 1
	3	right_s  sam_addr + 1 	sdram 2
		when the is bumped sam_addr = sam_addr + 2
at the 5th time
	4 	sam_s  sam_addr + 1   sdram 3
        5	right_s	 sam            sdram 4