MT40A256M16GE-075EAIT Datasheet, PDF (62/359 Pages) Micron Technology – Automotive DDR4 SDRAM

Truth Tables
Table 23: Truth Table – Command
Notes 1–5 apply to the entire table; Note 6 applies to all READ/WRITE commands
Function
Prev. Pres.
CKE CKE
MODE REGISTER SET
MRS H H L
REFRESH
REF H H L
Self refresh entry
SRE H
L
L
Self refresh exit
SRX L H H
L
Single-bank PRECHARGE
PRE H H L
PRECHARGE all banks
PREA H H L
Reserved for future use
RFU H H L
Bank ACTIVATE
ACT H H L
WRITE
BL8 fixed, BC4 fixed WR
H
H
L
BC4OTF
WRS4 H H L
BL8OTF
WRS8 H H L
WRITE
BL8 fixed, BC4 fixed WRA H
H
L
with auto _BC4OTF
precharge _BL8OTF
WRAS4 H H L
WRAS8 H H L
READ
BL8 fixed, BC4 fixed RD
H
H
L
BC4OTF
RDS4 H H L
BL8OTF
RDS8 H H L
READ
BL8 fixed, BC4 fixed RDA H H L
with auto _BC4OTF
precharge _BL8OTF
RDAS4 H H L
RDAS8 H H L
NO OPERATION
NOP H H L
Device DESELECTED
DES H H H
Power-down entry
PDE H
L
H
Power-down exit
PDX L H H
ZQ CALIBRATION LONG
ZQCL H H L
ZQ CALIBRATION SHORT
ZQCS H H L
H
L
L
L BG BA
H
L
L
HVV
H
L
L
HVV
XXXXXX
HHHHVV
H
L
H
L BG BA
H
L
H
L
V
V
H
L
H
H
L Row address (RA) BG BA
H
H
L
L BG BA
H
H
L
L BG BA
H
H
L
L BG BA
H
H
L
L BG BA
H
H
L
L BG BA
H
H
L
L BG BA
H
H
L
H BG BA
H
H
L
H BG BA
H
H
L
H BG BA
H
H
L
H BG BA
H
H
L
H BG BA
H
H
L
H BG BA
HHHHVV
XXXXXX
XXXXXX
XXXXXX
H
H
H
L
X
X
H
H
H
L
X
X
Notes
V
OP code
7
VVVVV
V V V V V 8, 9, 10
X X X X X 8, 9, 10,
VVVVV
11
V
V
V
L
V
VVVHV
RFU
V
Row address (RA)
V
V
V
L CA
V
L
V
L CA
V
H
V
L CA
V V V H CA
V
L
V
H CA
V H V H CA
V
V
V
L CA
V
L
V
L CA
V
H
V
L CA
V V V H CA
V
L
V
H CA
V H V H CA
VVVVV
12
XXXXX
13
X X X X X 10, 14
X X X X X 10, 14
XXXHX
X
X
X
L
X