54S416T データシートの表示（PDF） - CERAMATE TECHNICAL

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54S416T

1M x 4 BANKS x 16 BITS SDRAM

CERAMATE TECHNICAL 

54S416T

SDRAM

No Operation Command

The No Operation Command should be used in cases when the SDRAM is in a idle or a wait state to

prevent the SDRAM from registering any unwanted commands between operations. A No Operation

Command is registered when CS is low with RAS , CAS , and WE held high at the rising

edge of the clock. A No Operation Command will not terminate a previous operation that is still

executing, such as a burst read or write cycle.

Deselect Command

The Deselect Command performs the same function as a No Operation Command. Deselect

Command occurs when CS is brought high, the RAS , CAS , and WE signals become don't

cares.

Clock Suspend Mode

During normal access mode, CKE must be held high enabling the clock. When CKE is registered low

while at least one of the banks is active, Clock Suspend Mode is entered. The Clock Suspend mode

deactivates the internal clock and suspends any clocked operation that was currently being executed.

There is a one clock delay between the registration of CKE low and the time at which the SDRAM

operation suspends. While in Clock Suspend mode, the SDRAM ignores any new commands that are

issued. The Clock Suspend mode is exited by bringing CKE high. There is a one clock cycle delay

from when CKE returns high to when Clock Suspend mode is exited.

* All specs and applications shown above subject to change without prior notice.

1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN, R.O.C

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Page 11 of 47

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Rev 1.0 Aug.21,2002

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