1Gb: x4, x8, x16 DDR3 SDRAM
Operations
Figure 107: MRS Command to Power-Down Entry
T0
CK#
CK
tCK
tCH
tCL
tCPDED
NOP
NOP
NOP
NOP
T1
T2
Ta0
Ta1
Ta2
Ta3
Ta4
Command
MRS
NOP
Address
Valid
tMRSPDEN
tIS
tPD
CKE
Indicates A Break in
Time Scale
Don’t Care
Figure 108: Power-Down Exit to Refresh to Power-Down Entry
T0
CK#
CK
tCK
tCH
tCL
T1
T2
T3
T4
Ta0
Ta1
Tb0
Command
NOP
NOP
NOP
NOP
REFRESH
NOP
NOP
tCPDED
tXP1
tIS
CKE
tPD
Enter power-down
mode
tIH
tIS
tXPDLL2
Exit power-down
mode
Enter power-down
mode
Indicates A Break in
Time Scale
Don’t Care
Notes:
1.
t
XP must be satisfied before issuing the command.
2.
t
XPDLL must be satisfied (referenced to the registration of power-down exit) before the
next power-down can be entered.
PDF: 09005aef826aa906/Source: 09005aef82a357c3
1Gb_DDR3_4.fm - Rev. D 8/1/08 EN
157
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