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W9751G6KB-25 Datasheet(PDF) 15 Page - Winbond |
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W9751G6KB-25 Datasheet(HTML) 15 Page - Winbond |
15 / 87 page W9751G6KB Publication Release Date: Sep. 03, 2012 - 15 - Revision A04 8.2.3 Off-Chip Driver (OCD) Impedance Adjustment DDR2 SDRAM supports driver calibration feature and the flow chart in Figure 6 is an example of the sequence. Every calibration mode command should be followed by “OCD calibration mode exit” before any other command being issued. MRS should be set before entering OCD impedance adjustment and On Die Termination (ODT) should be carefully controlled depending on system environment. Start ALL OK All MR shoud be programmed before entering OCD impedance adjustment and ODT should be carefully controlled depending on system environment EMRS: Drive(0) DQ &DQS Low; DQS High EMRS: OCD calibration mode exit Test Need Calibration EMRS: OCD calibration mode exit EMRS: Enter Adjust Mode BL=4 code input to all DQs Inc, Dec or NOP EMRS: OCD calibration mode exit ALL OK EMRS: Drive(1) DQ &DQS High; DQS Low Test Need Calibration EMRS: OCD calibration mode exit EMRS: Enter Adjust Mode BL=4 code input to all DQs Inc, Dec or NOP EMRS: OCD calibration mode exit EMRS: OCD calibration mode exit End Figure 6 – OCD Impedance Adjustment Flow Chart |
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