HYB18M1G320BF QIMONDA [Qimonda AG], HYB18M1G320BF Datasheet - Page 38

• Manufacturer Part Number: HYB18M1G320BF
• Description: DRAMs for Mobile Applications 1-Gbit x32 DDR Mobile-RAM
• Manufacturer: QIMONDA [Qimonda AG]

2.4.8
The PRECHARGE command is used to deactivate (close) the
open row in a particular bank or the open rows in all banks.
The bank(s) will be available for a subsequent row access a
specified time (
issued. Input A10 determines whether one or all banks are to
be precharged, and in the case where only one bank is to be
precharged, inputs BA0, BA1 select the bank. Otherwise
BA0, BA1 are treated as “Don’t Care.”
Once a bank has been precharged, it is in the idle state and
must be activated prior to any READ or WRITE commands
being issued to that bank. A PRECHARGE command will be
treated as a NOP if there is no open row in that bank, or if the
previously open row is already in the process of precharging.
1) These parameters account for the number of clock cycles and depend on the operating frequency, as follows:
Rev.1.00, 2007-03
02022006-J7N7-GYFP
Parameter
ACTIVE to PRECHARGE command period
PRECHARGE command period
WRITE recovery time
no. of clock cycles = specified delay / clock period; round to the next higher integer.
t
RP
) after the PRECHARGE command is
PRECHARGE
38
Timing Parameters for PRECHARGE Command
t
t
t
RAS
RP
WR
Symbol
BA0,BA1
A11,A12
A0-A9
BA = Bank Address
(if A10 = L, otherwise Don't Care)
CKE
RAS
CAS
A10
WE
CK
CK
CS
45
22.5
15
min.
(High)
= Don't Care
One Bank
All Banks
- 7.5
70,000
–
–
BA
PRECHARGE Command
max.
1-Gbit DDR Mobile-RAM
HY[B/E]18M1G320BF
Unit
ns
ns
ns
FIGURE 31
TABLE 13
Data Sheet
Note
1)
1)
1)