NTC Proprietary
Level: Property
DDR3(L)-2Gb SDRAM
NT5CB(C)256M8JQ/NT5CB(C)128M16JR
Before a command that requires a locked DLL can be applied, a delay of at least tXSDLL must be satisfied. Depending on
the system environment and the amount of time spent in Self-Refresh, ZQ calibration commands may be required to
compensate for the voltage and temperature drift as described in “ZQ Calibration Commands”. To issue ZQ calibration
commands, applicable timing requirements must be satisfied.
CKE must remain HIGH for the entire Self-Refresh exit period tXSDLL for proper operation except for Self-Refresh re-entry.
Upon exit from Self-Refresh, the DDR3(L) SDRAM can be put back into Self-Refresh mode after waiting at least tXS period
and issuing one refresh command (refresh period of tRFC). NOP or deselect commands must be registered on each positive
clock edge during the Self-Refresh exit interval tXS. ODT must be turned off during tXSDLL.
The use of Self-Refresh mode instructs the possibility that an internally times refresh event can be missed when CKE is
raised for exit from Self-Refresh mode. Upon exit from Self-Refresh, the DDR3(L) SDRAM requires a minimum of one extra
refresh command before it is put back into Self-Refresh mode.
Self-Refresh Entry/Exit Timing
T0
T1
T2
Ta0
Tb0
Tc0
Tc1
Td0
Te0
Tf
CK, CK
tCKSRE
tCK
SRX
tCPDED
CKE
ODT
CMD
Valid
Valid
Valid
tCKESR
ODTL
NOP
T
SRE
NOP
SRX
NOP 1)
tXS
Valid 2) Valid 3)
Valid
Valid
tRP
tXSDLL
Enter Self Refresh
Note:
1. Only NOP or DES commands
Exit Self Refresh
Do Not
Care
Time
Break
2. Valid commands not requiring a locked DLL
3. Valid commands requiring a locked DLL
Version 1.4
05/2019
60
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