MT40A256M16GE-062E Datasheet, PDF (157/365 Pages) Micron Technology – 4Gb: x4, x8, x16 DDR4 SDRAM

4Gb: x4, x8, x16 DDR4 SDRAM
Power-Down Mode
Figure 93: Power-Down Entry After Write
T0
CK_c
CK_t
T1
Ta0
Ta1
Ta2
Ta3
Ta4
Ta5
Ta6
Ta7
Command
WRITE
DES
DES
DES
DES
DES
DES
DES
DES
DES
CKE
Address
Bank,
Col n
A10
DQS_t, DQS_c
DQ BL8
DQ BC4
WL = AL + CWL
DI
DI
DI
DI
DI
DI
DI
DI
b
b+1 b+2 b+3 b+4 b+5 b+6 b+7
DI
DI
DI
DI
n
n+1 n+2 n+3
t_WRPDEN
Note: 1. DI n (or b) = data-in from column n (or b).
Tb0
Tb1
Tb2
Tc0
Tc1
DES
DES
DES
DES
Valid
t_IS
t_CPDED
Valid
Valid
t_WR
t_PD
Power-Down
entry
Transitioning Data Time Break
Don’t Care
Figure 94: Precharge Power-Down Entry and Exit
T0
CK_c
CK_t
Command
CKE
T1
T2
Ta0
Ta1
Tb0
Tb1
Tc0
DES
DES
t_CPDED
t_IS
t_PD
DES
t_IH
DES
t_IS
DES
t_CKE
t_XP
DES
Valid
Valid
Valid
Enter
power-down
mode
Exit
power-down
mode
Time Break
Don’t Care
09005aef84af6dd0
4gb_ddr4_dram.pdf - Rev. G 1/17 EN
157
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