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2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
REFRESH Command
? t RRD has been satisfied after the prior ACTIVATE command (if applicable, for exam-
ple after activating a row in a different bank than the one affected by the REFpb com-
mand)
The target bank is inaccessible during per-bank REFRESH cycle time ( t RFCpb), howev-
er, other banks within the device are accessible and can be addressed during the cycle.
During the REFpb operation, any of the banks other than the one being refreshed can
be maintained in an active state or accessed by a READ or WRITE command.
When the per-bank REFRESH cycle has completed, the affected bank will be in the idle
state.
After issuing REFpb, the following conditions must be met:
?
?
t RFCpb
t RFCpb
must be satisfied before issuing a REFab command
must be satisfied before issuing an ACTIVATE command to the same bank
?
?
t RRD must be satisfied before issuing an ACTIVATE command to a different bank
t RFCpb must be satisfied before issuing another REFpb command
An all-bank REFRESH command (REFab) issues a REFRESH command to all banks. All
banks must be idle when REFab is issued (for instance, by issuing a PRECHARGE ALL
command prior to issuing an all-bank REFRESH command). REFab also synchronizes
the bank count between the controller and the SDRAM to zero. The REFab command
must not be issued to the device until the following conditions have been met:
? t RFCab has been satisfied following the prior REFab command
? t RFCpb has been satisfied following the prior REFpb command
? t RP has been satisfied following the prior PRECHARGE commands
After an all-bank REFRESH cycle has completed, all banks will be idle. After issuing RE-
Fab:
? t RFCab latency must be satisfied before issuing an ACTIVATE command
? t RFCab latency must be satisfied before issuing a REFab or REFpb command
Table 44: REFRESH Command Scheduling Separation Requirements
Minimum
Delay
Symbol
t RFCab
From
REFab
REFab
To
Notes
ACTIVATE command to any bank
REFpb
t RFCpb
REFpb
REFab
ACTIVATE command to same bank as REFpb
REFpb
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
75
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2010 Micron Technology, Inc. All rights reserved.
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MT42L256M32D4KP-MS
制造商:Micron Technology Inc 功能描述:256MX32 LPDDR2 PLASTIC IND TEMP GREEN WFBGA 1.2V - Bulk