Datasheet

DON'T CARE
NOTE 1. BL = 8 ,AL = 0, CWL = 9 , Preamble = 1t
CK
, t
CCD_S/L
= 5
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 T5.
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 (t
WTR
) are referenced from the first rising clock edge after the last write data shown at T18.
T0 T1 T5 T8 T9 T10 T11 T12
T13
T14
TRANSITIONING DATA
CK#
CK
CMD
T15
DESWRITE WRITE DES DES DES DES DES DES DES DES
DES
ADDR
DES
T16 T17
DES
DES
T18 T19
DES
T20
DQ
Bank
Col b
Bank
Col n
BG a or
BG b
BG a
Bank Group
ADDR
DQS, DQS#
t
CCD_S/L = 5
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
WL = AL + CWL = 9
Figure 129. Nonconsecutive WRITE (BL8) with 1t
CK
Preamble in Same or Different Bank Group
DON'T CARE
NOTE 1. BL = 8 ,AL = 0, CWL = 9 + 1 = 10
8
, Preamble = 2t
CK
, t
CCD_S/L
= 6
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 T6.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Disable.
NOTE 6. t
CCD_S/L
=5 isn’t allowed in 2t
CK
preamble mode.
NOTE 7. 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 T20.
NOTE 8. When operating in 2t
CK
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 2tCK Write Preamble Mode.
T0 T1 T6 T8 T9 T10 T11 T12
T13
T14
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
T15
DESWRITE WRITE DES DES DES DES DES DES DES DES
DES
Bank,
Col n
BG a
Bank Group
ADDR
DES
DQS, DQS#
T16 T17
WL = AL + CWL = 10
BG a or
BG b
DES
DES
T18 T19
Bank,
Col b
Din
b+4
Din
b+5
Din
b+6
t
CCD_S/L = 6
DES
T20
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 130. Nonconsecutive WRITE (BL8) with 2t
CK
Preamble in Same or Different Bank Group
AS4C256M16D4
Confidential
- 115 of 201 -
Rev.1.0 Aug.2019