Datasheet
DON'T CARE
NOTE 1. BL = 8 / BC = 4, AL = 0, CWL = 9, Preamble = 1t
CK
NOTE 2. Din n (or b) = data-in to column n (or column b).
NOTE 3. DES commands are shown for ease of illustration; other commands may be valid at these times.
NOTE 4. BC4 setting activated by MR0[A1:A0 = 0:1] and A12 =0 during WRITE command at T0. BL8 setting activated by MR0[A1:A0 = 0:1] and A12 =1 during WRITE command at T4.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Disable.
NOTE 6. The wRite recovery time (tWR) and write timing parameter (tWTR) are referenced from the first rising clock edge after the last write data shown at T17
T0 T1 T4 T7 T8 T9 T10 T11
T12
T13
TRANSITIONING DATA
CK#
CK
CMD
T14
DESWRITE WRITE DES DES DES DES DES DES DES DES
DES
ADDR
DES
T15 T16
DES
DES
T17 T18
DES
T19
DQ
Bank
Col b
Bank
Col n
BG bBG a
Bank Group
ADDR
DQS, DQS#
t
CCD_S = 4
t
WR
4 Clocks
t
WTR
Din
n
Din
n+1
Din
n+2
Din
n+3
Din
b
t
WPRE
t
WPST
WL = AL + CWL = 9
Din
b+1
Din
b+2
Din
b+3
Din
b+4
Din
b+5
Din
b+6
Din
b+7
WL = AL + CWL = 9
Figure 141. WRITE (BC4)OTF to WRITE (BL8) with 1t
CK
Preamble in Different Bank Group
DON'T CARE
NOTE 1. BL = 8 / BC = 4, AL = 0, CWL = 9, Preamble = 1t
CK
, t
WR
= 12
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. BC4 setting activated by MR0[A1:A0 = 0:1] and A12 =0 during WRITE command at T0. BL8 setting activated by MR0[A1:A0 = 0:0] or MR0[A1:0 = 01] and A12 =1 during WRITE command at T0.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Disable.
NOTE 6. The write recovery time (t
WR
) is referenced from the first rising clock edge after the last write data shown at T13.
t
WR
specifies the last burst write cycle until the precharge command can be issued to the same bank.
T0 T1 T2 T3 T7 T8 T9 T10
T11
T12
TRANSITIONING DATA
Din
n
Din
n+1
Din
n+2
4 Clocks
CK#
CK
DQ
CMD
T13
DESWRITE DES DES DES DES DES DES DES DES DES
DES
BGa,Bank b
Col n
ADDR
DES
T14 T23
DES
PRE
T24 T25
Din
n+3
t
WR = 12
t
RP
DES
T26
Din
n
Din
n+1
Din
n+2
DQ
Din
n+7
Din
n+3
Din
n+4
Din
n+5
Din
n+6
BGa,Bankb
(or all)
BC4(OTF) Operation:
BL8 Operation:
DQS, DQS#
DQS, DQS#
WL = AL + CWL = 9
Figure 142. WRITE (BL8/BC4) OTF to PRECHARGE Operation with 1t
CK
Preamble
AS4C256M16D4
Confidential
- 121 of 201 -
Rev.1.0 Aug.2019