Datasheet

DON'T CARE
NOTE 1. BL = 8, 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. BL8 setting activated by either MR0[A1:A0 = 0:0] or MR0[A1:A0 = 0:1] and A12 = 1 during WRITE command at T0 and T4.
NOTE 5. C/A Parity = Disable, CS to C/A Latency = Disable, Write DBI = Disable.
NOTE 6. The write recovery time (t
WR
) and write timing parameter (t
WTR
) 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
n+4
Din
b+7
t
WPRE
t
WPST
WL = AL + CWL = 9
Din
n+5
Din
n+6
Din
n+7
Din
b
Din
b+1
Din
b+2
Din
b+3
Din
b+4
Din
b+5
Din
b+6
Figure 127. Consecutive WRITE (BL8) with 1t
CK
Preamble in Different Bank Group
DON'T CARE
NOTE 1. BL = 8 ,AL = 0, CWL = 9 + 1 = 107, Preamble = 2t
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. BL8 setting activated by either MR0[A1:A0 = 0:0] or MR0[A1:A0 = 0:1] and A12 = 1 during WRITE command at T0 and T4.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Disable.
NOTE 6. The write recovery time(t
WR
) and write timing parameter(tWTR) are referenced from the first rising clock edge after the last write data shown at T18.
NOTE 7. When operating in 2tCK Write Preamble Mode, CWL must be programmed to a value at least 1 clock greater than the lowest CWL
setting supported in the applicable t
CK
range. That means CWL = 9 is not allowed when operating in 2t
CK
Write Preamble Mode.
T0 T1 T4 T7 T8 T9 T10 T11
T12
T13
TRANSITIONING DATA
t
WPRE
t
WPST
Din
n
Din
n+1
Din
n+2
Din
b+1
Din
b+2
Din
b+7
WL = AL + CWL = 10
CK#
CK
DQ
ADDR
CMD
T14
DESWRITE WRITE 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 = 10
BG b
DES
DES
T17 T18
Bank,
Col b
Din
b+4
Din
b+5
Din
b+6
t
CCD_S = 4
DES
T19
Din
b+3
Din
n+3
Din
n+4
Din
n+6
Din
n+7
Din
b
Din
n+5
t
WR
4 Clocks
t
WTR
Figure 128. Consecutive WRITE (BL8) with 2t
CK
Preamble in Different Bank Group
AS4C256M16D4
Confidential
- 114 of 201 -
Rev.1.0 Aug.2019