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NT5TU64M8EE Datasheet(PDF) 48 Page - Nanya Technology Corporation. |
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NT5TU64M8EE Datasheet(HTML) 48 Page - Nanya Technology Corporation. |
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48 / 96 page  DDR2 512Mb SDRAM NT5TU64M8EE / NT5TU32M16EG 48 Version 1.0 Nanya Technology Corp.© 09/2014 All Rights Reserved No Operation Command The No Operation Command should be used in cases when the SDRAM is in a idle or a wait state. The purpose of the No Operation Command is 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 care. Input Clock Frequency Change During operation the DRAM input clock frequency can be changed under the following conditions: a) During Self-Refresh operation b) DRAM is in Precharge Power-down mode and ODT is completely turned off. The DDR2-SDRAM has to be in Precharged Power-down mode and idle. ODT must be already turned off and CKE must be at a logic “low” state. After a minimum of two clock cycles after tRP and tAOFD have been satisfied the input clock frequency can be changed. A stable new clock frequency has to be provided, before CKE can b e changed to a “high” logic level again. After tXP has been satisfied a DLL RESET command via EMRS(1) has to be issued. During the following DLL re-lock period of 200 clock cycles, ODT must remain off. After the DLL-re-lock period the DRAM is ready to operate with the new clock frequency. Example: Input frequency change during Precharge Power-Down mode NOP NOP T0 T2 T1 T3 T4 Tx Tx+1 Ty CMD NOP NOP NOP NOP NOP DLL RESET Ty+2 Ty+3 CKE Frequency Change occurs here NOP NOP Frequ.Ch. Tz tXP Stable new clock before power-down exit CK, CK tRP tAOFD Minimum 2 clocks required before changing the frequency Ty+1 NOP Valid Command 200 clocks ODT is off during DLL RESET |
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