MT40A256M16GE-075EAUT Datasheet, PDF (133/359 Pages) Micron Technology – Automotive DDR4 SDRAM

4Gb: x8, x16 Automotive DDR4 SDRAM
ACTIVATE Command
Figure 74: sPPR – Repair, and Exit
Te0
Tf0
CK_c
Tg0
Tg1
CK_t
CMD
ACT
WR
DES
DES
BG
BGf
BA
BAf
BGf
N/A
N/A
BAf
N/A
N/A
ADDR Valid
Valid
N/A
N/A
CKE
DQS_t
DQS_c
DQs1
All Banks
Precharged
and idle state
WL = CWL + AL + PL
tRCD
sPPR Repair
bit 0 bit 1
sPPR Repair
Th0
Th1
DES
DES
N/A
N/A
N/A
N/A
N/A
N/A
4nCK
bit 6 bit 7
tPGM_s
sPPR Repair
Tj0
Tj1
DES
DES
N/A
N/A
N/A
N/A
N/A
N/A
t_WR
Tj2
Tk0
DES
PRE
N/A
Valid
N/A
Valid
N/A
Valid
Tk1
DES
N/A
N/A
N/A
Tm0
MRS4
Valid
Valid
Valid
(A5=0)
Tm1
DES
N/A
N/A
N/A
Tn0
Valid
Valid
Valid
Valid
sPPR Repair
tPGM_Exit_s
sPPR Recognition
tPGMPST_s
sPPR Exit
Normal
Mode
Don’t Care
Table 45: DDR4 sPPR Timing Parameters DDR4-1600 through DDR4-3200
Parameter
sPPR programming time
sPPR precharge exit time
sPPR exit time
Symbol
t_{PGM_s}
t_{PGM_Exit_s}
t_{PGMPST_s}
Min
t _{RCD (MIN)+ WL + 4nCK}
+ ^tWR (MIN)
20
t_MOD
hPPR/sPPR Support Identifier
Max
–
–
–
Unit
ns
ns
ns
Table 46: DDR4 Repair Mode Support Identifier
MPR Page 2
MPR0
A7
A6
A5
A4
A3
A2
UI0
UI1
UI2
UI3
UI4
UI5
hPPR¹
sPPR²
R_{TT_WR}
Temp sensor
CRC
Notes: 1. 0 = hPPR mode is not available, 1 = hPPR mode is available.
2. 0 = sPPR mode is not available, 1 = sPPR mode is available.
3. Gray shaded areas are for reference only.
A1
A0
UI6
UI7
R_{TT_WR}
ACTIVATE Command
The ACTIVATE command is used to open (activate) a row in a particular bank for subse-
quent access. The values on the BG[1:0] inputs select the bank group, the BA[1:0] inputs
select the bank within the bank group, and the address provided on inputs A[17:0] se-
lects the row within the bank. This row remains active (open) for accesses until a PRE-
CHARGE command is issued to that bank. A PRECHARGE command must be issued be-
fore opening a different row in the same bank. Bank-to-bank command timing for AC-
TIVATE commands uses two different timing parameters, depending on whether the
banks are in the same or different bank group. ^tRRD_S (short) is used for timing be-
tween banks located in different bank groups. ^tRRD_L (long) is used for timing between
banks located in the same bank group. Another timing restriction for consecutive ACTI-
CCMTD-1725822587-10418
4gb_auto_ddr4_sdram_z90b.pdf - Rev. D 01/17 EN
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