| 摘要 |
PROBLEM TO BE SOLVED: To reduce costs by reducing chip sizes of a synchronous DRAM or the like by reducing an amount of hardware of circuits necessary for bank control of the synchronous DRAM or the like having a plurality of banks. SOLUTION: In a synchronous DRAM having, for example, eight banks capable of executing independently each of the selection operation of a word line and the amplifying operation of a read-out signal, by providing to all banks in common a bank selection circuit BS to turn bank selection signals BA0-BA7 selectively into an effective level and a row control circuit RC generating sense amplifier drive control signals SAE1-SAE2 necessary for amplifying operation of a bank pre-charge control signal PRE and the read-out signal, as well as providing a bank control circuit BC0 or the like including each flip-flops selectively switching to a set state or a reset state following the bank selection signals and control signals, and based on the flip-flop state and the above described control signal, a specified bank is selectively activated or de-activated.
|
