Datasheet
DON'T CARE
NOTE 1. 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 = 1:0].
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 T15.
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
2 Clocks
t
WTR
Din
n
Din
n+1
Din
n+2
Din
b+3
t
WPRE
t
WPST
WL = AL + CWL = 9
Din
n+3
Din
b
Din
b+1
Din
b+2
Figure 133. WRITE (BC4) Fixed to WRITE (BC4) Fixed with 1t
CK
Preamble in Different Bank Group
DON'T CARE
NOTE 1. BC = 4, AL = 0, CWL = 9, CL = 11, Preamble = 1t
CK
NOTE 2. DIN n = data-in to column n(or column b). DOUT b = data-out from 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 READ command at T15.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Disable.
NOTE 6. The write timing parameter (t
WTR_S
) are referenced from the first rising clock edge after the last write data shown at T13. When AL is non-zero, the external read command at T15 can be pulled in by AL.
T0 T1 T7 T8 T9 T10 T11 T12
T13
T15
TRANSITIONING DATA
t
WPRE
Din
n
Din
n+1
Din
n+2
RL = AL + CL = 11
CK#
CK
DQ
ADDR
CMD
T24
DESWRITE DES DES DES DES DES DES DES READ DES
DES
Bank,
Col n
BG a
Bank Group
ADDR
DES
DQS, DQS#
T25 T26
WL = AL + CWL = 9
BG b
DES
DES
T27 T28
Bank,
Col b
Din
b
Din
b+1
Din
b+2
Din
n+7
t
WPST
t
RPRE
Din
n+3
Din
n+4
Din
n+5
Din
n+6
4 Clocks
t
WTR_S = 2
DES
T29
Din
n+3
Din
n+4
Din
n+5
Din
n+6
Figure 134. WRITE (BL8) to READ (BL8) with 1t
CK
Preamble in Different Bank Group
AS4C256M16D4
Confidential
- 117 of 201 -
Rev.1.0 Aug.2019