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HYB18L256169BF Datasheet, PDF (29/48 Pages) Qimonda AG – 256-Mbit Mobile-RAM
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HY[B/E]18L256169BF-7.5
256-Mbit Mobile-RAM
Functional Description
2.4.6.3 WRITE - DQM Operation
DQM may be used to mask write data: when asserted HIGH, input data will be masked and no write will be
performed. The generic timing parameters as listed in Table 11 also apply to this DQM operation. The write burst
in progress is not affected and will continue as programmed.
#, +
#OM MA ND ./ 0
!DDRE SS
$1-
$1
72 )4%
"#AO L!N
$)N
./ 0
./ 0
./ 0
$)N  $)N 
./ 0
"A! # OLN"ANK ! #O LU MNN
$O NgT#A RE
$)N$A TA)NTOCOLU MN N
"URST,ENGTHIN TH ECASESHO WN 
SU BSE QUE NTELE MENTSOF$A TA)NAREPROVID EDIN THEPROGRAM ME DORDERFO LLO WIN G
$)N WITHTH EFIRSTELEM ENT$)N  BEIN GMA SKED
$1 -WRITELATE NCYIS CLO CKCYCLE S
Figure 32 WRITE Burst - DQM Operation
2.4.6.4 WRITE to READ
A WRITE burst may be followed by, or truncated with a READ command. The READ command can be performed
to the same or a different (active) bank. With the registration of the READ command, data inputs will be ignored
and no WRITE will be performed, as shown in Figure 33.
#, +
#OM MA ND 72 )4%
!DDRE SS
"A!
#O LN
./ 0
./ 0
2% !$
"A!
#O LB
$1 $)N
$1 $)N
$)N  $)N 
7RITEDATA
AREIGNO RED
$)N  $)N 
./ 0
./ 0
./ 0
./ 0
#, 
(IG H :
$/ B $/ B  $/ B 
#, 
(IGH :
$/ B $)B 
"A! #O LNBB ANK! COLU MN NB
$)N$A TA)NTOCOLUMN N$/ B$ATA /UTFRO MCOLU MN B
$O NgT#A RE
"URST,ENGTHIN TH ECASESHO WN 
SUBSEQU ENTELE MENTSOF$A TA)N/ UTAREPROVID ED INTHEPROGRA MME DORDERFOLLOWIN G $)N$ / B
$)N  IS IG N OREDDUE TO2 %! $COMM AND .O $1 -MAS KING REQUIREDATTHIS POIN T
Figure 33 WRITE to READ Timing
Data Sheet
29
Rev. 1.02, 2006-12
02032006-MP0M-7FQG
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