hyb18m1g16 Qimonda, hyb18m1g16 Datasheet - Page 21

• Manufacturer Part Number: hyb18m1g16
• Description: Drams For Mobile Applications 1-gbit X16 Ddr Mobile-ram Rohs Compliant
• Manufacturer: Qimonda

2.4.4
Before any READ or WRITE commands can be issued to a
bank within the DDR Mobile-RAM, a row in that bank must be
“opened” (activated). This is accomplished via the ACTIVE
command and addresses BA0, BA1, A0 - A12 (see
Figure
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
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
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
Rev.1.0, 2007-03
10242006-Y557-TZXW
Command
BA0, BA1
10), which decode and select both the bank and the
A0-A12
t
RRD
CK
CK
.
ACTIVE
BA x
ACT
Row
t
RCD
specification. A subsequent
NOP
t
RRD
t
RC
. A subsequent
BA y
ACT
Row
21
NOP
t
RCD
BA0,BA1
NOP
A0-A12
BA = Bank Address
RA = Row Address
CKE
RAS
CAS
WE
CK
CK
CS
RD/WR
BA y
(High)
Col
= Don't Care
HY[B/E]18M1G16[0/1]BF
Bank Activate Timings
1-Gbit DDR Mobile-RAM
RA
BA
ACTIVE Command
= Don't Care
FIGURE 10
FIGURE 11
NOP
Data Sheet