K4N51163QC-ZC Datasheet, PDF (26/64 Pages) Samsung semiconductor – 512Mbit gDDR2 SDRAM

K4N51163QC-ZC
512M gDDR2 SDRAM
Off-Chip Driver (OCD) Impedance Adjustment
gDDR2 SDRAM supports driver calibration feature and the flow chart below is an example of sequence. Every calibration mode com-
mand should be followed by “OCD calibration mode exit” before any other command being issued. MRS should be set before entering
OCD impedance adjustment and ODT (On Die Termination) should be carefully controlled depending on system environment.
MRS shoud be set before entering OCD impedance adjustment and ODT should be
carefully controlled depending on system environment
Start
EMRS: OCD calibration mode exit
EMRS: Drive(1)
DQ & DQS High; DQS Low
EMRS: Drive(0)
DQ & DQS Low; DQS High
Test
ALL OK
Need Calibration
EMRS: OCD calibration mode exit
ALL OK
Test
Need Calibration
EMRS: OCD calibration mode exit
EMRS :
Enter Adjust Mode
EMRS :
Enter Adjust Mode
BL=4 code input to all DQs
Inc, Dec, or NOP
BL=4 code input to all DQs
Inc, Dec, or NOP
EMRS: OCD calibration mode exit
EMRS: OCD calibration mode exit
EMRS: OCD calibration mode exit
End
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Rev 1.5 Oct. 2005