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K4N26323AE Datasheet(PDF) 10 Page - Samsung semiconductor |
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K4N26323AE Datasheet(HTML) 10 Page - Samsung semiconductor |
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10 / 52 page  - 10 - Rev. 1.7 (Jan. 2003) 128M GDDR2 SDRAM K4N26323AE-GC Power-Up Sequence GDDR2 SDRAMs must be powered up and initialized in a predefined manner to prevent undefined operations. 1. Power Up Sequence - Apply Power and Keep CKE at low state. (All other inputs may be undefined) - Apply VDD before VDDQ. - Apply VDDQ before VREF. - Start low frequency clock(100MHz) and maintain stable condition for minimum 200us. - The minimum of 200us after stable power and clock (CK, /CK), apply NOP and take CKE to be high. - Issue precharge command for all banks of the device ( tS/tH =0.5tCK). - Issue EMRS command to initialize DRAM with DLL OFF and On-die Termination OFF( tS/tH=0.5tCK) . - Issue EMRS command to control DLL and decide on-die termination state. Within 100 clocks after issuing EMRS command for DLL on, stable high frequency clock should be supplied to DRAM. (V=Valid value) - The additional 1ms clock cycles are required to lock the DLL and determine value of on-die termination after issuing EMRS command or supplying stable clock from a controller. Apply NOP during Locking DLL to protect invalid command. - Issue precharge command for all banks of the device. - Issue EMRS command - Issue at least 10 or more Auto refresh command to update the value of on-die termination. - Issue a MRS command to initialize the mode register. - Issue any command. Power up & Initialization Sequence CMD tRP CK,CK CKE Precharge NOP 1st Auto Refresh 10th Auto Refresh tRFC MRS 4 Clock min. Any Command 1ms 200 us EMRS2 < 100tCK all banks stable high freq. NOP * Minimum setup/hold time tIS, tIHmin = 0.5tCK at the Low frequency without DLL * Within 100 tCK after issuing EMRS2, PLL(DLL) of controller should be enabled. * During changing clock frequency, the changing rate should be smaller than 100ps/30tCK low freq. (> 100Mhz) EMRS1 NOP NOP EMRS Precharge all banks tRP tMRD Address Bus BA1 BA0 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 01 0 X X 0 X 00 X Extended Mode Register Address Bus BA1 BA0 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 01 0 V V 1 V V V V Extended Mode Register tRFC |
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Similar Description - K4N26323AE |
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