Datasheet
DON'T CARE
NOTE 1. BC = 4, AL = 0, CWL = 9, Preamble = 1t
CK
, WR = 12
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 = Disable.
NOTE 6. The write recovery time (t
WR
) is referenced from the first rising clock edge after the last write data shown at T11.
WR specifies the last burst write cycle until the precharge command can be issued to the same bank.
T0 T1 T2 T3 T7 T8 T9 T10
T11
T12
TRANSITIONING DATA
Din
n
Din
n+1
Din
n+2
2 Clocks
CK#
CK
DQ
CMD
T13
DESWRA DES DES DES DES DES DES DES DES DES
DES
BGa,Bank b
Col n
ADDR
DES
T14 T23
DES
DES
T24 T25
Din
n+3
WR = 12
t
RP
DES
T26
BC4(Fixed) Operation:
DQS, DQS#
WL = AL + CWL = 9
Figure 145. WRITE (BC4) Fixed with Auto PRECHARGE Operation and 1t
CK
Preamble
DON'T CARE
NOTE 1. BL = 8 / 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 = 0:1] and A12 =0 during WRITE command at T0.
BL8 setting activated by either MR0[A1:A0 = 0:0] or MR0[A1:A0 = 0:1] and A12 =1 during WRITE command at T0.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Enable, CRC = Disable.
NOTE 6. The write recovery time (t
WR_DBI
) and write timing parameter (t
WTR_DBI
) are referenced from the first rising clock edge after the last write data shown at T13.
T0 T1 T2 T3 T7 T8 T9 T10
T11
T12
TRANSITIONING DATA
4 Clocks
CK#
CK
DQ
CMD
T13
DESWRITE DES DES DES DES DES DES DES DES DES
DES
DES
T14 T15
DES
DES
T16 T17
t
WTR
DES
T18
DQ
BC4(OTF) Operation:
BL8 Operation:
WL = AL + CWL = 9
Bank
Col n
BG a
Bank Group
ADDR
ADDR
DQS, DQS#
DQS, DQS#
Din
n
Din
n+1
Din
n+2
Din
n+3
Din
n
Din
n+1
Din
n+2
Din
n+3
DBI#
DBI#
Din
n
Din
n+1
Din
n+2
Din
n+7
Din
n+3
Din
n+4
Din
n+5
Din
n+6
Din
n
Din
n+1
Din
n+2
Din
n+7
Din
n+3
Din
n+4
Din
n+5
Din
n+6
t
WR
Figure 146. WRITE (BL8/BC4) OTF with 1t
CK
Preamble and DBI
AS4C256M16D4
Confidential
- 123 of 201 -
Rev.1.0 Aug.2019