MT40A1G4RH-075E Datasheet, PDF (72/365 Pages) Micron Technology – Programmable data strobe preambles

4Gb: x4, x8, x16 DDR4 SDRAM
DLL-On/Off Switching Procedures
Figure 17: DLL Switch Sequence from DLL-On to DLL-Off
CK_c
CK_t
CKE
Command
Ta
Tb0
Tb1
Tc
t_CKSRE/t_{CKSRE_PAR}
t_{IS tCPDED}
MRS²
SRE³
DES
Note 4
Td
Te0
Te1
Tf
Tg
Th
t_CKSRX5
Valid
t_{XS_FAST}
SRX⁶
Valid⁷
Valid
Valid⁸
Valid
Valid⁹
Address
ODT
t_RP
t_IS
t_CKESR/t_{CKESR_PAR}
Valid
t_{XS_ABORT}
t_XS
Valid
Valid
Valid
Enter self refresh
Exit self refresh
Time Break
Notes:
1. Starting in the idle state. R_TT in stable state.
2. Disable DLL by setting MR1 bit A0 to 0.
3. Enter SR.
4. Change frequency.
5. Clock must be stable ^tCKSRX.
6. Exit SR.
7. Update mode registers allowed with DLL-off settings met.
Don’t Care
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4gb_ddr4_dram.pdf - Rev. G 1/17 EN
72
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