When DDR SDRAM came out a magazine illustrated their article with light pulses traveling between the bricks and the core. From my electronics classes it was cle

When DDR SDRAM came out a magazine illustrated their article with light pulses traveling between the bricks and the core. From my electronics classes it was clear to me that the line would be either up or down, and these pulses were just for illustration. What would an illustrator know about electronics, right? The article then calculated how many bits must be in-flight on the board to achieve the higher data rate given the bus width and the distance :-)