Datasheet
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. BC4 setting activated by MR0[A1:A0 = 0:1] and A12 = 0 during WRITE command at T0 and READ command at T17.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Disable.
NOTE 6. The write timing parameter (t
WTR_L
) 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 T17 can be pulled in by AL.
T0 T1 T7 T8 T9 T10 T11 T12
T13
T15
TRANSITIONING DATA
CK#
CK
CMD
T16
DESWRITE DES DES DES DES DES DES DES DES DES
READ
ADDR
DES
T17 T20
DES
DES
T27 T28
DES
T29
DQ
Bank
Col b
Bank
Col n
BG bBG a
Bank Group
ADDR
DQS, DQS#
4 Clocks
t
WTR_L = 4
Din
n
Din
n+1
Din
n+2
t
WPRE
WL = AL + CWL = 9
Din
n+3
Din
b
Din
b+1
Din
b+2
t
WPST
t
RPRE
RL = AL + CL = 11
Figure 137. WRITE (BC4)OTF to READ (BC4)OTF with 1t
CK
Preamble in Same 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. 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 timing parameter (t
WTR_S
) are referenced from the first rising clock edge after the last write data shown at T11.
When AL is non-zero, the external read command at T13 can be pulled in by AL.
T0 T1 T7 T8 T9 T10 T11 T12
T13
T22
TRANSITIONING DATA
CK#
CK
CMD
T23
DESWRITE DES DES DES DES DES DES READ DES DES
DES
ADDR
DES
T24 T25
DES
DES
T26 T27
DES
T28
DQ
Bank
Col b
Bank
Col n
BG bBG a
Bank Group
ADDR
DQS, DQS#
2 Clocks
t
WTR_S = 2
Din
n
Din
n+1
Din
n+2
Din
b+3
t
WPRE
t
RPST
WL = AL + CWL = 9
Din
n+3
Din
b
Din
b+1
Din
b+2
t
WPST
t
RPRE
RL = AL + CL = 11
Figure 138. WRITE (BC4)Fixed to READ (BC4)Fixed with 1t
CK
Preamble in Different Bank Group
AS4C256M16D4
Confidential
- 119 of 201 -
Rev.1.0 Aug.2019