Datasheet

Ta0 Ta1 Ta2 Tb0 Tb1 Tb2T0
MRS DESDES DES DES
NOTE1: MRS at Ta1 may or may not modify CAL, t
MOD_CAL
is computed based on new t
CAL
setting.
NOTE2: t
MOD_CAL
= t
MOD
+ t
CAL
t
CAL
t
CAL
CK#
CK
CS#
Tc0
CMD
(w/o CS#)
VALID
t
MOD_CAL
Figure 18.
t
MOD_CAL
,
MRS to valid command timing with CAL enabled
Ta1 Ta2 Tb0 Tb1 Tb2 Tc0Ta0
MRS DES MRSDES DES DES
NOTE1: MRS command at Ta1 enables CAL mode.
NOTE2: t
MRD_CAL
= t
MOD
+ t
CAL
.
t
CAL
t
MRD_CAL
CK#
CK
CS#
CMD
(w/o CS#)
Figure 19. CAL enabling MRS to next MRS command, t
MRD_CAL
Ta0 Ta1 Ta2 Tb0 Tb1 Tb2T0
MRS DESDES DES DES
NOTE1: MRS at Ta1 may or may not modify CAL, t
MRD_CAL
is computed based on new t
CAL
setting.
NOTE2: t
MRD_CAL
= t
MOD
+ t
CAL
t
CAL
t
CAL
CK#
CK
CS#
Tc0
CMD
(w/o CS#)
MRS
t
MRD_CAL
Figure 20. t
MRD_CAL
, mode register cycle time with CAL enabled
AS4C256M16D4
Confidential
- 37 of 201 -
Rev.1.0 Aug.2019