DDR3(L) 4Gb SDRAM
NT5CB(C)512M8DN / NT5CB(C)256M16DP
DLL Switch Sequence from DLL-on to DLL-off
T0
T1
Ta0
Ta1
Tb0
Tc0
Td0
Td1
Te0
Te1
Tf0
CK
CK
tMOD
NOP
tCKSRE
NOP
4)
tCKSRX 5)
SRX 6)
tXS
tMOD
NOP
CMD
CKE
MRS 2)
SRE 3)
MRS 7)
Valid 8)
1)
NOP
tCKESR
Valid8)
ODT
Valid 8)
Do not
Care
Time
break
Note:
ODT: Static LOW in case RTT_Nom and RTT_WR is enabled, otherwise static Low or High
1) Starting with Idle State, RTT in Hi-Z State.
2) Disable DLL by setting MR1 Bit A0 to 1.
3) Enter SR.
4) Change Frequency.
5) Clock must be stable at least tCKSRX.
6) Exit SR.
7) Update Mode registers with DLL off parameters setting.
8) Any valid command.
Version 2.3
02/2017
37
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