ESMT
M14D5121632A (2H)
Operation Temperature Condition (TC) -40°C~95°C
OCD Adjustable Mode
CLK
CLK
EMRS(1)
EMRS(1)
Command
DQS, DQS
DQ
NOP
DT2
NOP
t
WR
WL
t
DS
t
DH
DT0
DT1
DT3
DM
OCD adjustable
OCD calibration mode exit
Note: For proper operation of adjustable mode, WL = RL - 1 = AL + CL - 1 clocks and tDS / tDH should be met as the
above timing diagram. For input data pattern for adjustment, DT0 - DT3 is a fixed order and "not affected by
MRS addressing mode (ie. sequential or interleave).
OCD Driver Mode
CLK
CLK
EMRS(1)
EMRS(1)
Command
DQS, DQS
DQ
NOP
High-Z
High-Z
DQs high and DQS low for Drive-1, DQs low and DQS high for Drive-0
DQs high for Drive-1
DQs low for Drive-0
tOIT
t
OIT
Enter drive mode
OCD Calibration mode exit
Note: Drive mode, both Drive-1 and Drive-0, is used for controllers to measure DDR2 SDRAM driver impedance. In
this mode, all outputs are driven out tOIT after “enter drive mode” command and all output drivers are
turned-off tOIT after “OCD calibration mode exit” command as the above timing diagram.
Elite Semiconductor Memory Technology Inc.
Publication Date : Aug. 2011
Revision : 1.1 32/62
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
