•If we access data
column-wise, we proceed through each
bank in order. By the time we call a13, we
(just) avoid bbt.
•On the other hand,
if we access data row-wise, we get a11 in bank
1, a12 in bank 5, a13 in bank 1 again - so
instead of access on clock cycle 3, we have to
wait until cycle 9. Then we get a14 in bank 5
again on cycle 10, etc.
•