HY[B/E]18L128160B[C/F]-7.5
128-Mbit Mobile-RAM
Functional DescriptionCommands
2.4.4
ACTIVE
#,+
#+%
ꢇ(IGHꢈ
#3
2!3
#!3
7%
!ꢄꢀ!ꢅꢅ
"!ꢄꢉ"!ꢅ
2!
"!
ꢃ $ONgT #ARE
"! ꢃ "ANK !DDRESS
2! ꢃ 2OW !DDRESS
Figure 9
ACTIVE Command
Before any READ or WRITE commands can be issued to a bank within the Mobile-RAM, a row in that bank must
be “opened” (activated). This is accomplished via the ACTIVE command and addresses A0 - A11, BA0 and BA1
(see Figure 9), which decode and select both the bank and the row to be activated. After opening a row (issuing
an ACTIVE command), a READ or WRITE command may be issued to that row, subject to the tRCD specification.
A subsequent ACTIVE command to a different row in the same bank can only be issued after the previous active
row has been “closed” (precharged).
The minimum time interval between successive ACTIVE commands to the same bank is defined by tRC. A
subsequent ACTIVE command to another bank can be issued while the first bank is being accessed, which results
in a reduction of total row-access overhead. The minimum time interval between successive ACTIVE commands
to different banks is defined by tRRD
.
#,+
!#4
2/7
"! X
./0
!#4
2/7
"! Y
./0
./0
2$ꢑ72
#/,
./0
#OMMAND
!ꢄꢀ!ꢅꢅ
"! Y
"!ꢄꢉ "!ꢅ
T22$
T2#$
ꢃ $ONgT #ARE
Figure 10 Bank Activate Timings
Data Sheet
17
Rev. 1.71, 2007-01
05282004-NZNK-8T0D
QIMONDA [ QIMONDA AG ]
