MT40A256M16GE-075EAUT Datasheet, PDF (154/359 Pages) Micron Technology – Automotive DDR4 SDRAM

4Gb: x8, x16 Automotive DDR4 SDRAM
Power-Down Mode
Figure 94: PRECHARGE/PRECHARGE ALL Command to Power-Down Entry
T0
T1
T2
Ta0
Tb0
Tb1
CK_c
CK_t
Command
PRE or
PREA
DES
DES
DES
Valid
Address
CKE
Valid
t_IS
t_CPDED
t_PD
t_CKE
t_PREPDEN
Time Break
Don’t Care
Figure 95: MRS Command to Power-Down Entry
T0
T1
Ta0
Ta1
Tb0
Tb1
CK_c
CK_t
Command
MRS
DES
DES
DES
DES
Address
Valid
CKE
t_CPDED
t_IS
t_PD
t_CKE
t_MRSPDEN
Valid
Time Break
Don’t Care
Power-Down Clarifications – Case 1
When CKE is registered LOW for power-down entry, ^tPD (MIN) must be satisfied before
CKE can be registered HIGH for power-down exit. The minimum value of parameter
t_{PD (MIN) is equal to the minimum value of parameter} t_{CKE (MIN) as shown in the}
Timing Parameters by Speed Bin table. A detailed example of Case 1 follows.
CCMTD-1725822587-10418
4gb_auto_ddr4_sdram_z90b.pdf - Rev. D 01/17 EN
154
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