I was going through the datasheet of 1Gb DDR2 SDRAM. It's organized in rows, columns and banks. The 1Gb is actually 64Mb*16 datalines. Which is 8Mb*8 Banks * 16 data lines I can't figure out how they got 8Mb? In the datasheet block diagram (attached), there are 13 row address lines. So 2^13 = 8k there are 8 column addr lines, so 2^8 = 256 8192*256 = 2Mb ???