Datasheet

Write Burst Operation
The following write timing diagram is to help understanding of each write parameter's meaning and just examples.
The details of the definition of each parameter will be defined separately.
In these write timing diagram, CK and DQS are shown aligned and also DQS and DQ are shown center aligned
for illustration purpose.
DON'T CARE
NOTE 1. BL = 8 ,WL = 9, AL = 0, CWL = 9, Preamble = 1t
CK
NOTE 2. Din n = data-in to column n.
NOTE 3. DES commands are shown for ease of illustration; other commands may be valid at these times.
NOTE 4. BL8 setting activated by either MR0[A1:A0 = 0:0] or MR0[A1:A0 = 0:1] and A12 = 1 during WRITE command at T0.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Disable.
T0 T1 T2 T7 T8 T9 T10 T11
T12
T13
TRANSITIONING DATA
t
WPRE
t
WPST
Din
n
Din
n+1
Din
n+2
Din
n+3
Din
n+4
Din
n+5
Din
n+6
CK#
CK
DQ
ADDR
CMD
T14
DESWRITE DES DES DES DES DES DES DES DES DES
DES
Bank,
Col n
BG a
Bank Group
ADDR
DES
DQS, DQS#
T15 T16
WL = AL + CWL = 9
Din
n+7
Figure 125. WRITE Burst Operation WL = 9 (AL = 0, CWL = 9, BL8)
DON'T CARE
NOTE 1. BL = 8 ,WL = 19, AL = 10 (CL-1), CWL = 9, Preamble = 1t
CK
NOTE 2. Din n = data-in to column n.
NOTE 3. DES commands are shown for ease of illustration; other commands may be valid at these times.
NOTE 4. BL8 setting activated by either MR0[A1:A0 = 0:0] or MR0[A1:A0 = 0:1] and A12 = 1 during WRITE command at T0.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Disable.
T0 T1 T2 T9 T10 T11 T17 T18
T19
T20
TRANSITIONING DATA
t
WPRE
t
WPST
Din
n
Din
n+1
Din
n+2
Din
n+3
Din
n+4
Din
n+5
Din
n+6
CK#
CK
DQ
ADDR
CMD
T21
DESWRITE DES DES DES DES DES DES DES DES DES
DES
Bank,
Col n
BG a
Bank Group
ADDR
DES
DQS, DQS#
T22 T23
WL = AL + CWL = 19
Din
n+7
AL = 10 CWL = 9
Figure 126. WRITE Burst Operation WL = 19 (AL = 10, CWL = 9, BL8)
AS4C256M16D4
Confidential
- 113 of 201 -
Rev.1.0 Aug.2019