HY[B/E]18L256160B[C/F]X-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.
#,+
./0
72)4%
./0
./0
./0
./0
#OMMAN
RESS
"A !ꢏ
#OL N
!
$1-
$1
$) N
$) Nꢔꢁ
$) Nꢔꢆ
ꢒ $ONgT #ARE
"A !ꢏ #OL N ꢒ "ANK !ꢏ #OLUMN N
$) N ꢒ $ATA )N TO COLUMN N
"URST ,ENGTH ꢒ ꢈ IN THE CASE SHOWNꢐ
ꢆ SUBSEQUENT ELEMENTS OF $ATA )N ARE PROVI E IN THE PROGRAMME OR ER FOLLOWING
$) Nꢏ WITH THE FIRST ELEMENT ꢌ$) Nꢔꢀꢍ BEING MASKE ꢐ
$1- WRITE LATENCY IS ꢂ CLOCK CYCLESꢐ
Figure 32 WRITE Burst - DQM Operation
2.4.6.4
WRITE to READ
A WRITE burst may be followed by, or truncated with a READ command. The READ command can be performed
to the same or a different (active) bank. With the registration of the READ command, data inputs will be ignored
and no WRITE will be performed, as shown in Figure 33.
#,+
72)4%
./0
./0
2%!$
./0
./0
./0
./0
#OMMAN
RESS
"A !ꢏ
#OL N
"A !ꢏ
#OL B
!
#,ꢒꢁ
(IGHꢎ:
$) N
$) N
$) Nꢔꢀ
$) Nꢔꢀ
$) Nꢔꢁ
$/ B
$/ Bꢔꢀ
$/ Bꢔꢁ
$1
$1
7RITE ATA
ARE IGNORE
#,ꢒꢆ
(IGHꢎ:
$) Nꢔꢁ
$/ B
$) Bꢔꢀ
"A !ꢏ #OL N ꢌBꢍ ꢒ BANK !ꢏ COLUMN N ꢌBꢍ
$) N ꢒ $ATA )N TO COLUMN Nꢕ $/ B ꢒ $ATA /UT FROM COLUMN Bꢕ
"URST ,ENGTH ꢒ ꢈ IN THE CASE SHOWNꢐ
ꢒ $ONgT #ARE
ꢆ SUBSEQUENT ELEMENTS OF $ATA )N ꢌ/UTꢍ ARE PROVI E IN THE PROGRAMME OR ER FOLLOWING $) N ꢌ$/ Bꢍꢐ
$) Nꢔꢆ IS IGNORE UE TO 2%!$ COMMAN ꢐ .O $1- MASKING REQUIRE AT THIS POINTꢐ
Figure 33 WRITE to READ Timing
Data Sheet
29
Rev. 1.11, 2007-01
07142005-CR47-RB2E
QIMONDA [ QIMONDA AG ]
