Datasheet

VALIDACT ACT VALID ACT VALID ACT VALID VALID ACT DES
NOTE 1. tFAW: Four activate window.
T0 Ta0 Tb0 Tc0 Tc1 Td0
Td1
CK#
CK
ADDR
DON'T CARE
t
RRD
Bank Group
(GB)
CMD
Bank
t
RRD
TIME BREAK
t
FAW
VALID VALID VALIDVALID VALID
VALID VALID VALIDVALID VALID
VALID VALID VALIDVALID VALID
t
RRD
Figure 75. t
FAW
Timing
VALIDWRITE VALID VALID VALID VALID VALID VALID VALID VALID VALID
NOTE 1. tWTR_S : Delay from start of internal write transaction to internal read command to a different Bank Group.
When AL is non-zero, the external read command at Tb0 can be pulled in by AL.
T0 T1 T2 Ta0 Ta1 Ta2 Ta3 Ta4 Ta5
Ta6
CK#
CK
CMD
VALID VALID READ VALID
ADDR
DQ
Din
n+1
Din
n+2
Din
n+3
Din
n+4
Din
n+5
Din
n+6
Din
n
Din
n+7
Ta7 Tb0 Tb1
BANK
WL
DON'T CARETRANSITIONING DATATIME BREAK
Bank c Bank c
BG a BG b
Col n Col n
Bank Group
(BG)
DQS, DQS#
t
WPRE
t
WPST
t
WTR_S
RL
Figure 76. t
WTR_S
Timing (WRITE to READ, Different Bank Group, CRC and DM Disabled)
VALIDWRITE VALID VALID VALID VALID VALID VALID VALID VALID VALID
NOTE 1. tWTR_L: Delay from start of internal write transaction to internal read command to the same Bank Group.
When AL is nonzero, the external read command at Tb0 can be pulled in by AL.
T0 T1 T2 Ta0 Ta1 Ta2 Ta3 Ta4 Ta5
Ta6
CK#
CK
CMD
VALID VALID READ VALID
ADDR
DQ
Din
n+1
Din
n+2
Din
n+3
Din
n+4
Din
n+5
Din
n+6
Din
n
Din
n+7
Ta7 Tb0 Tb1
BANK
WL
DON'T CARETRANSITIONING DATATIME BREAK
Bank c Bank c
BG a BG a
Col n Col n
Bank Group
(BG)
DQS, DQS#
t
WPRE
t
WPST
t
WTR_L
RL
Figure 77. t
WTR_L
Timing (WRITE to READ, Same Bank Group, CRC and DM Disabled)
AS4C256M16D4
Confidential
- 84 of 201 -
Rev.1.0 Aug.2019