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2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
REFRESH Command
Figure 57: t SRF Definition
Example A 1
CKE
Enter self refresh mode
t REFW
t SRF
Exit self refresh mode
Example B 2
CKE
t REFW
Enter self refresh mode
t SRF
Exit self refresh mode
Example C 3
t SRF
t REFW
CKE
Exit self refresh mode
Example D 4
t SRF1
t REFW
t SRF2
CKE
Enter self refresh mode
Exit self refresh mode
Enter self refresh mode
Exit self refresh mode
Notes:
1.
2.
3.
4.
Time in self refresh mode is fully enclosed in the refresh window ( t REFW).
At self refresh entry.
At self refresh exit.
Several intervals in self refresh during one t REFW interval. In this example, t SRF = t SRF1 +
t SRF2.
Figure 58: All-Bank REFRESH Operation
T0
T1
T2
T3
T4
Tx
Tx + 1
Ty
Ty + 1
CK#
CK
CA[9:0]
AB
t RPab
t RFCab
t RFCab
CMD
PRECHARGE
NOP
NOP
REFab
NOP
REFab
NOP
Valid
NOP
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
81
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
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