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NT5TU64M8EE Datasheet(PDF) 11 Page - Nanya Technology Corporation. |
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NT5TU64M8EE Datasheet(HTML) 11 Page - Nanya Technology Corporation. |
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11 / 96 page  DDR2 512Mb SDRAM NT5TU64M8EE / NT5TU32M16EG 11 Version 1.0 Nanya Technology Corp.© 09/2014 All Rights Reserved 3. For the minimum of 200us after stable power (VDD, VDDL, VDDQ, VREF, and VTT are between their minimum and maximum values as stated in Re-commanded DC operating conditions table, and stable clock, then apply NOP or Deselect & take CKE HIGH. 4. Wait minimum of 400 ns then issue precharge all command. NOP or Deselect applied during 400 ns period. 5. Issue an EMRS command to EMR(2). (To issue EMRS command to EMR(2), provide LOW to BA0 and BA1,HIGH to BA1.) 6. Issue an EMRS command to EMR(3). (To issue EMRS command to EMR(3), provide LOW to BA1, HIGH to BA0 and BA1.) 7. Issue EMRS to enable DLL. (To issue DLL Enable command, provide LOW to A0, HIGH to BA0 and LOW to BA1-BA1 and A12-A13. And A9=A8=A7=LOW must be used when issuing this command.) 8. Issue a Mode Register Set command for DLL reset.(To issue DLL Reset command, provide HIGH to A8 and LOW to BA0-BA1.) 9. Issue a precharge all command. 10. Issue 2 more auto-refresh commands. 11. Issue a MRS command with LOW to A8 to initialize device operation (i.e. to program operating parameters without resetting the DLL.) 12. At least 200 clocks after step 7, execute OCD Calibration (Off Chip Driver impedance adjustment). If OCD calibration is not used, EMRs to EMR (1) to set OCD Calibration Default (A9=A8=A7=HIGH) followed by EMRS to EMR (1) to exit OCD Calibration Mode (A9=A8=A7=LOW) must be issued with other operating parameters of EMR(1). 13. The DDR2 DRAM is now ready for normal operation. * To guarantee ODT off, VREF must be valid and a low level must be applied to the ODT pin. Example: CK, CK 1st Auto refresh MRS PRE ALL EMRS CMD 2nd Auto refresh tRP tRP tRFC tRFC Extended Mode Register Set with DLL enable Mode Register Set with DLL reset PRE ALL tMRD tMRD min. 200 cycles to lock the DLL CKE Command 400 ns MRS NOP tMRD EMRS Follow OCD flowchart ODT "low" Follow OCD flowchart EMRS |
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