W9816G6JH Datasheet, PDF (11/42 Pages) Winbond – 512K X 2 BANKS X 16 BITS SDRAM

W9816G6JH
7.17 Power Down Mode
The Power Down mode is initiated by holding CKE low. All of the receiver circuits except CKE are
gated off to reduce the power. The Power Down mode does not perform any refresh operations;
therefore the device can not remain in Power Down mode longer than the Refresh period (t_REF) of the
device.
The Power Down mode is exited by bringing CKE high. When CKE goes high, a No Operation
Command is required on the next rising clock edge, depending on t_CK. The input buffers need to be
enabled with CKE held high for a period equal to t_CKS(min) + t_CK(min).
7.18 No Operation Command
The No Operation Command should be used in cases when the SDRAM is in an idle or a wait state to
prevent the SDRAM from registering any unwanted commands between operations. A No Operation
Command is registered when C S is low with R A S , C A S and W E 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.
7.19 Deselect Command
The Deselect Command performs the same function as a No Operation Command. Deselect
Command occurs when C S is brought high, the R A S , C A S and W E signals become don't cares.
7.20 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 and a column access/burst is in progess, 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.
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Publication Release Date: Jun. 24, 2014
Revision: A01