Data Sheet
HY[B/E]18M1G16[0/1]BF
1-Gbit DDR Mobile-RAM
TABLE 10
Timing Parameters for ACTIVE Command
Parameter
Symbol
- 6
- 7.5
Unit Note
min.
60
max.
min.
65
max.
1)
ACTIVE to ACTIVE command period
ACTIVE to READ or WRITE delay
ACTIVE bank A to ACTIVE bank B delay
tRC
–
–
–
–
ns
tRCD
tRRD
18
12
–
–
22.5
15
ns
ns
1) These parameters account for the number of clock cycles and depend on the operating frequency, as follows:
no. of clock cycles = specified delay / clock period; round to the next higher integer.
2.4.5
READ
READ bursts are initiated with a READ command, as shown
in Figure 12.
FIGURE 12
READ Command
Basic timings for the DQs are shown in Figure 13; they apply
to all read operations.
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 that is accessed will start precharge at the completion
of the burst, provided tRAS has been satisfied. For the generic
READ commands used in the following illustrations, Auto
Precharge is disabled.
CK
CK
CKE
(High)
CS
RAS
CAS
WE
A0-A9
CA
Enable AP
AP
A10
Disable AP
BA0,BA1
BA
= Don't Care
BA = Bank Address
CA = Column Address
AP = Auto Precharge
Rev.1.0, 2007-03
22
10242006-Y557-TZXW
QIMONDA [ QIMONDA AG ]
