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W9751G6KB-25 Datasheet(PDF) 12 Page - Winbond |
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W9751G6KB-25 Datasheet(HTML) 12 Page - Winbond |
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12 / 87 page  W9751G6KB Publication Release Date: Sep. 03, 2012 - 12 - Revision A04 8.2.2.2 DLL Enable/Disable The DLL must be enabled for normal operation. DLL enable is required during power-up initialization, and upon returning to normal operation after having the DLL disabled. The DLL is automatically disabled when entering Self Refresh operation and is automatically re-enabled and reset upon exit of Self Refresh operation. Any time the DLL is enabled (and subsequently reset), 200 clock cycles must occur before a Read command can be issued to allow time for the internal clock to be synchronized with the external clock. Failing to wait for synchronization to occur may result in a violation of the tAC or tDQSCK parameters. BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 0 1 OCD program BT Rtt Address Field Extended Mode Register (1) BA1 BA0 MRS mode 0 0 0 0 1 1 1 1 MR EMR (1) EMR (2) EMR (3) A6 A2 0 0 0 0 1 1 1 1 WR Additive Latency Qoff 0* 1 DQS Rtt D.I.C DLL Rtt (nominal) ODT Disabled 75 ohm 150 ohm 50 ohm* 2 0 A0 1 DLL Enable Enable Disable OCD Calibration Program OCD calibration mode exit; matain setting Adjust mode* 3 OCD Calibration default* 4 Drive (1) Drive (0) A9 A8 A7 1 0 0 0 1 1 1 1 1 0 0 0 0 0 0 Driver impedance adjustment A12 1 0 Output buffer enabled Qoff (Optional)* 5 Output buffer disabled A10 1 0 DQS Enable Disable A10 (DQS Enable) 0 (Enable) 1 (Disable) Strobe Function Matrix DQS DQS DQS DQS DQS Hi-z Output driver impedance control Reduced Normal A1 0 1 A5 0 0 0 0 1 1 1 1 A4 0 0 1 1 0 0 1 1 A3 0 1 0 1 0 1 1 0 Latency 0 3 4 Reserved 1 2 Output Driver Impedance Control Driver size 100% 60% Additive Latency 5 6 Notes: 1. A11 default is “0” RDQS disabled. 2. Optional for DDR2-667, mandatory for DDR2-800 and DDR2-1066. 3. When Adjust mode is issued, AL from previously set value must be applied. 4. After setting to default, OCD calibration mode needs to be exited by setting A9-A7 to 000. Refer to the section 8.2.3 for detailed information. 5. Output disabled - DQs, LDQS, LDQS , UDQS, UDQS . This feature is used in conjunction with DIMM IDD measurements when IDDQ is not desired to be included. Figure 3 – EMR (1) |
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