Datasheet

Write Operation
Write Timing Definitions
This drawing is for example only to enumerate the strobe edges that “belong” to a Write burst. No actual timing
violations are shown here. For a valid burst all timing parameters for each edge of a burst need to be satisfied
(not only for one edge - as shown).
DESWRITE DES DES DES DES DES DES DES DES DES
NOTE 1. BL8, WL = 9 (AL = 0, CWL = 9)
NOTE 2. Din n = data-in from column n.
NOTE 3. DES commands are shown for ease of illustration : other commands may be valid at these times.
NOTE 4. BL8 stting activated by either MR0[A1:0=00] or MR0[A1:0=01] and A12=1 during WRITE command at T0.
NOTE 5. t
DQSS
must be met at each rising clock edge.
T0 T1 T2 T7 T8 T9 T10 T11 T12 T13
T14
CK#
CK
WL = AL + CWL
DON'T CARETRANSITIONING DATA
BG,Bank
Col n
t
DQSS(min)
t
WPRE
t
DQSH(min)
t
DQSL
t
DQSS
t
DSH
t
DQSH
t
DQSL
t
DQSH
t
DQSL
t
DQSH
t
DQSL
t
DQSH
t
DQSL(min)
t
DSH
t
DSH
t
WPST
t
DSS
t
DSS
t
DSS
t
DSS
t
DSS
t
DQSS(nominal)
t
WPRE
t
DQSH(min)
t
DQSL
t
DSH
t
DQSH
t
DQSL
t
DQSH
t
DQSL
t
DQSH
t
DQSL
t
DQSH
t
DQSL(min)
t
DSH
t
DSH
t
DSH
t
WPST
t
DSS
t
DSS
t
DSS
t
DSS
t
DSS
t
DSH
DQ
2
Din
n
Din
n+2
Din
n+3
DM#
t
DQSS(max)
t
WPRE
t
DQSH(min) t
DQSL
t
DSH
t
DQSH
t
DQSL
t
DQSH
t
DQSL
t
DQSH
t
DQSL
t
DQSH
t
DQSL(min)
t
DSH
t
DSH
t
DSH
t
WPST
t
DSS
t
DSS
t
DSS
t
DSS
t
DSS
Din
n+4
Din
n+6
Din
n+7
t
DQSS
CMD
3
ADD
4
DQS, DQS#
DQS, DQS#
DQS, DQS#
Figure 123. Write Timing Definition and Parameters with 1t
CK
Preamble
AS4C256M16D4
Confidential
- 111 of 201 -
Rev.1.0 Aug.2019