Datasheet

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. 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. BC4 setting activated by either MR0[A1:A0 = 1:0] or MR0[A1:A0 = 0:1] and A12 = 0 during READ command at T0.
NOTE 6. CA Parity = Disable, CS to CA Latency = Disable, Write DBI = Disable, Write CRC = Enable, DM = Enable.
NOTE 7. The write recovery time (t
WR_CRC_ DM
) and write timing parameter (t
WR_S_CRC_ DM
/t
WR_L_CRC_ DM
) are referenced from the first rising clock edge after the last write data shown at T13.
T0 T1 T2 T6 T7 T8 T9 T10
T11
T12
TRANSITIONING DATA
CK#
CK
CMD
T13
DESWRITE DES DES DES DES DES DES DES DES DES
DES
ADDR
DES
T14 T15
DES
DES
T16 T17
DES
T18
DQ
Bank
Col n
BG a
Bank Group
ADDR
DQS, DQS#
t
WR_CRC_DM
4 Clocks
t
WTR_S_CRC_DM/
t
WTR_L_CRC_DM
Din
n
Din
n+1
Din
n+2
Din
n+3
Din
n+4
CRC
t
WPRE
t
WPST
WL = AL + CWL = 9
Din
n+5
Din
n+6
Din
n+7
DM
n
DM
n+1
DM
n+2
DM
n+3
DM
n+4
DM
n+5
DM
n+6
BL = 8
BL = 8
DM
DM
n+7
Din
n
Din
n+1
Din
n+2
DM
n
DM
n+1
DM
n+2
DQ
BC = 4 (OTF/Fixed)
BC = 4 (OTF/Fixed)
DM
Din
n+3
DM
n+3
CRC
Figure 153. WRITE (BL8/BC4) OTF/Fixed with 1t
CK
Preamble and Write CRC and DM in Same or
Different Bank Group
AS4C256M16D4
Confidential
- 127 of 201 -
Rev.1.0 Aug.2019