MT40A1G8WE-083E Datasheet, PDF (118/358 Pages) Micron Technology – Automotive DDR4 SDRAM

8Gb: x8, x16 Automotive DDR4 SDRAM
V_REFDQ Calibration
Figure 65: V_REF Full Step: From V_REF,min to V_REF,maxCase
V
REF
Voltage
V
REF,max
Full range
step
V_{REF,val_tol}
t1
V_REF
(V_DDQ(DC))
V_REF,min
Time
Figure 66: V_REF Full Step: From V_REF,max to V_REF,minCase
V_REF
Voltage
V_REF,max
Full range
step
t1
V_REF,min
V_{REF,val_tol}
Time
V
REF
(V_DDQ(DC))
V_REFDQ Target Settings
The V_REFDQ initial settings are largely dependant on the ODT termination settings. The
table below shows all of the possible initial settings available for V_REFDQ training; it is
unlikely the lower ODT settings would be used in most cases.
CCMTD-1406124318-10419
8gb_auto_ddr4_dram.pdf - Rev. C 3/17 EN
118
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