Datasheet
DON'T CARE
NOTE 1. BC = 4, AL = 0, CWL = 9, Preamble = 1t
CK
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 = 1:0].
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Enable, CRC = Disable.
NOTE 6. The write recovery time (tWR_DBI) and write timing parameter (tWTR_DBI) are referenced from the first rising clock edge after the last write data shown at T11.
T0 T1 T2 T3 T7 T8 T9 T10
T11
T12
TRANSITIONING DATA
2 Clocks
CK#
CK
DQ
CMD
T13
DESWRITE DES DES DES DES DES DES DES DES DES
DES
Bank
Col n
DES
T14 T15
DES
DES
T16 T17
t
WTR
t
WR
DES
T18
BC4(Fixed) Operation:
WL = AL + CWL = 9
BG a
Din
n
Din
n+1
Din
n+2
Din
n+3
Din
n
Din
n+1
Din
n+2
Din
n+3
DBI#
Bank Group
ADDR
ADDR
DQS, DQS#
Figure 147. WRITE (BC4) Fixed with 1t
CK
Preamble and DBI
DON'T CARE
NOTE 1. BL = 8, AL = 0, CWL = 9, PL = 4, 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. CA Parity = Enable, 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 T21.
T0 T1 T4 T11 T12 T13 T14 T15
T16
T17
TRANSITIONING DATA
CK#
CK
DQ
CMD
T18
DESWRITE WRITE DES DES DES DES DES DES DES DES
DES
ADDR
DES
T19 T20
DES
DES
T21 T22
DES
T23
WL = PL + AL + CWL = 13
Bank
Col b
Bank
Col n
BG bBG a
Bank Group
ADDR
DQS, DQS#
t
WR
4 Clocks
t
WTR
Din
n
Din
n+1
Din
n+2
Din
n+7
Din
n+3
Din
n+4
Din
n+5
Din
n+6
Din
b
Din
b+1
Din
b+2
Din
b+3
Din
b+4
Din
b+5
Din
b+6
Din
b+7
t
WPRE
t
WPST
t
CCD_S = 4
PAR
VALIDVALID
WL = PL + AL + CWL = 13
Figure 148. Consecutive WRITE (BL8) with 1t
CK
Preamble and CA Parity in Different Bank Group
AS4C256M16D4
Confidential
- 124 of 201 -
Rev.1.0 Aug.2019