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W9812G2GB-75 Datasheet(PDF) 11 Page - Winbond |
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W9812G2GB-75 Datasheet(HTML) 11 Page - Winbond |
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11 / 42 page  W9812G2GB 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 (tREF) 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 tCK. The input buffers need to be enabled with CKE held high for a period equal to tCKS (min) + tCK (min). 7.18. 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. 7.19. 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. 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, 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. Publication Release Date:Aug. 13,2007 - 11 - Revision A07 |
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