HYB18L256160B Datasheet, PDF (19/58 Pages) Qimonda AG – DRAMs for Mobile Applications 256-Mbit Mobile-RAM

Data Sheet
2.4.5
READ
Subsequent to programming the mode register with CAS
latency and burst length, READ bursts are initiated with a
READ command, as shown in Figure 11. Basic timings for
the DQs are shown in Figure 12; they apply to all read
operations and therefore are omitted from all subsequent
timing diagrams.
The starting column and bank addresses are provided with
the READ command and Auto Precharge is either enabled or
disabled for that burst access. If Auto Precharge is enabled,
the row being accessed starts precharge at the completion of
the burst, provided t_RAS has been satisfied. For the generic
READ commands used in the following illustrations, Auto
Precharge is disabled.
HY[B/E]18L256160B[C/F]L-7.5
256-Mbit Mobile-RAM
&/ .
&. ( +LJ K
&6 
5$ 6
&$ 6
:(
$$
$ 
%$% $
&$ 
(QDE OH$ 3
$3
'LVD EOH$3
%$ 
FIGURE 11
READ Command
%$ % DQ N$GGUHV V 
&$  & R OXPQ $ GG UHV V
$3 $ XWR3 UH FK DUJH 
'R Q W& DUH
&/ .
'40 
'4 
FIGURE 12
Basic READ Timing Parameters for DQs
W_{'4 =}
W_$&
W_/=
W_$&
W_2+
W₊ _=
W_2+
'2 Q  '2 Q  
'R Q W&D UH
Rev. 1.73, 2006-09
19
01302004-CZ2R-J9SE